$ man perl
$ man perl > perl-docs.md

$ cat ./perl-docs.md

PERL(1)                                Perl Programmers Reference Guide                                PERL(1)

NAME
       perl - The Perl 5 language interpreter

SYNOPSIS
       perl [ -sTtuUWX ]      [ -hv ] [ -V[:configvar] ]      [ -cw ] [ -d[t][:debugger] ] [ -D[number/list] ]
            [ -pna ] [ -Fpattern ] [ -l[octal] ] [ -0[octal/hexadecimal] ]
            [ -Idir ] [ -m[-]module ] [ -M[-]'module...' ] [ -f ]      [ -C [number/list] ]      [ -S ]
            [ -x[dir] ]      [ -i[extension] ]
            [ [-e|-E] 'command' ] [ -- ] [ programfile ] [ argument ]...

       For more information on these options, you can run "perldoc perlrun".

GETTING HELP
       The perldoc program gives you access to all the documentation that comes with Perl.  You can get more
       documentation, tutorials and community support online at <https://www.perl.org/>.

       If you're new to Perl, you should start by running "perldoc perlintro", which is a general intro for
       beginners and provides some background to help you navigate the rest of Perl's extensive documentation.
       Run "perldoc perldoc" to learn more things you can do with perldoc.

       For ease of access, the Perl manual has been split up into several sections.

   Overview
           perl                Perl overview (this section)
           perlintro           Perl introduction for beginners
           perlrun             Perl execution and options
           perltoc             Perl documentation table of contents

   Tutorials
           perlreftut          Perl references short introduction
           perldsc             Perl data structures intro
           perllol             Perl data structures: arrays of arrays

           perlrequick         Perl regular expressions quick start
           perlretut           Perl regular expressions tutorial

           perlootut           Perl OO tutorial for beginners

           perlperf            Perl Performance and Optimization Techniques

           perlstyle           Perl style guide

           perlcheat           Perl cheat sheet
           perltrap            Perl traps for the unwary
           perldebtut          Perl debugging tutorial

           perlfaq             Perl frequently asked questions
             perlfaq1          General Questions About Perl
             perlfaq2          Obtaining and Learning about Perl
             perlfaq3          Programming Tools
             perlfaq4          Data Manipulation
             perlfaq5          Files and Formats
             perlfaq6          Regexes
             perlfaq7          Perl Language Issues
             perlfaq8          System Interaction
             perlfaq9          Networking

   Reference Manual
           perlsyn             Perl syntax
           perldata            Perl data structures
           perlop              Perl operators and precedence
           perlsub             Perl subroutines
           perlfunc            Perl built-in functions
             perlopentut       Perl open() tutorial
             perlpacktut       Perl pack() and unpack() tutorial
           perlpod             Perl plain old documentation
           perlpodspec         Perl plain old documentation format specification
           perlpodstyle        Perl POD style guide
           perldiag            Perl diagnostic messages
           perldeprecation     Perl deprecations
           perllexwarn         Perl warnings and their control
           perldebug           Perl debugging
           perlvar             Perl predefined variables
           perlre              Perl regular expressions, the rest of the story
           perlrebackslash     Perl regular expression backslash sequences
           perlrecharclass     Perl regular expression character classes
           perlreref           Perl regular expressions quick reference
           perlref             Perl references, the rest of the story
           perlform            Perl formats
           perlobj             Perl objects
           perltie             Perl objects hidden behind simple variables
             perldbmfilter     Perl DBM filters

           perlipc             Perl interprocess communication
           perlfork            Perl fork() information
           perlnumber          Perl number semantics

           perlthrtut          Perl threads tutorial

           perlport            Perl portability guide
           perllocale          Perl locale support
           perluniintro        Perl Unicode introduction
           perlunicode         Perl Unicode support
           perlunicook         Perl Unicode cookbook
           perlunifaq          Perl Unicode FAQ
           perluniprops        Index of Unicode properties in Perl
           perlunitut          Perl Unicode tutorial
           perlebcdic          Considerations for running Perl on EBCDIC platforms

           perlsec             Perl security
           perlsecpolicy       Perl security report handling policy

           perlmod             Perl modules: how they work
           perlmodlib          Perl modules: how to write and use
           perlmodstyle        Perl modules: how to write modules with style
           perlmodinstall      Perl modules: how to install from CPAN
           perlnewmod          Perl modules: preparing a new module for distribution
           perlpragma          Perl modules: writing a user pragma

           perlutil            utilities packaged with the Perl distribution

           perlfilter          Perl source filters

           perldtrace          Perl's support for DTrace

           perlglossary        Perl Glossary

   Internals and C Language Interface
           perlembed           Perl ways to embed perl in your C or C++ application
           perldebguts         Perl debugging guts and tips
           perlxstut           Perl XS tutorial
           perlxs              Perl XS application programming interface
           perlxstypemap       Perl XS C/Perl type conversion tools
           perlclib            Internal replacements for standard C library functions
           perlguts            Perl internal functions for those doing extensions
           perlcall            Perl calling conventions from C
           perlmroapi          Perl method resolution plugin interface
           perlreapi           Perl regular expression plugin interface
           perlreguts          Perl regular expression engine internals

           perlapi             Perl API listing (autogenerated)
           perlintern          Perl internal functions (autogenerated)
           perliol             C API for Perl's implementation of IO in Layers
           perlapio            Perl internal IO abstraction interface

           perlhack            Perl hackers guide
           perlsource          Guide to the Perl source tree
           perlinterp          Overview of the Perl interpreter source and how it works
           perlhacktut         Walk through the creation of a simple C code patch
           perlhacktips        Tips for Perl core C code hacking
           perlpolicy          Perl development policies
           perlgov             Perl Rules of Governance
           perlgit             Using git with the Perl repository

   Miscellaneous
           perlbook            Perl book information
           perlcommunity       Perl community information

           perldoc             Look up Perl documentation in Pod format

           perlhist            Perl history records
           perldelta           Perl changes since previous version
           perl5320delta       Perl changes in version 5.32.0
           perl5303delta       Perl changes in version 5.30.3
           perl5302delta       Perl changes in version 5.30.2
           perl5301delta       Perl changes in version 5.30.1
           perl5300delta       Perl changes in version 5.30.0
           perl5283delta       Perl changes in version 5.28.3
           perl5282delta       Perl changes in version 5.28.2
           perl5281delta       Perl changes in version 5.28.1
           perl5280delta       Perl changes in version 5.28.0
           perl5263delta       Perl changes in version 5.26.3
           perl5262delta       Perl changes in version 5.26.2
           perl5261delta       Perl changes in version 5.26.1
           perl5260delta       Perl changes in version 5.26.0
           perl5244delta       Perl changes in version 5.24.4
           perl5243delta       Perl changes in version 5.24.3
           perl5242delta       Perl changes in version 5.24.2
           perl5241delta       Perl changes in version 5.24.1
           perl5240delta       Perl changes in version 5.24.0
           perl5224delta       Perl changes in version 5.22.4
           perl5223delta       Perl changes in version 5.22.3
           perl5222delta       Perl changes in version 5.22.2
           perl5221delta       Perl changes in version 5.22.1
           perl5220delta       Perl changes in version 5.22.0
           perl5203delta       Perl changes in version 5.20.3
           perl5202delta       Perl changes in version 5.20.2
           perl5201delta       Perl changes in version 5.20.1
           perl5200delta       Perl changes in version 5.20.0
           perl5184delta       Perl changes in version 5.18.4
           perl5182delta       Perl changes in version 5.18.2
           perl5181delta       Perl changes in version 5.18.1
           perl5180delta       Perl changes in version 5.18.0
           perl5163delta       Perl changes in version 5.16.3
           perl5162delta       Perl changes in version 5.16.2
           perl5161delta       Perl changes in version 5.16.1
           perl5160delta       Perl changes in version 5.16.0
           perl5144delta       Perl changes in version 5.14.4
           perl5143delta       Perl changes in version 5.14.3
           perl5142delta       Perl changes in version 5.14.2
           perl5141delta       Perl changes in version 5.14.1
           perl5140delta       Perl changes in version 5.14.0
           perl5125delta       Perl changes in version 5.12.5
           perl5124delta       Perl changes in version 5.12.4
           perl5123delta       Perl changes in version 5.12.3
           perl5122delta       Perl changes in version 5.12.2
           perl5121delta       Perl changes in version 5.12.1
           perl5120delta       Perl changes in version 5.12.0
           perl5101delta       Perl changes in version 5.10.1
           perl5100delta       Perl changes in version 5.10.0
           perl589delta        Perl changes in version 5.8.9
           perl588delta        Perl changes in version 5.8.8
           perl587delta        Perl changes in version 5.8.7
           perl586delta        Perl changes in version 5.8.6
           perl585delta        Perl changes in version 5.8.5
           perl584delta        Perl changes in version 5.8.4
           perl583delta        Perl changes in version 5.8.3
           perl582delta        Perl changes in version 5.8.2
           perl581delta        Perl changes in version 5.8.1
           perl58delta         Perl changes in version 5.8.0
           perl561delta        Perl changes in version 5.6.1
           perl56delta         Perl changes in version 5.6
           perl5005delta       Perl changes in version 5.005
           perl5004delta       Perl changes in version 5.004

           perlexperiment      A listing of experimental features in Perl

           perlartistic        Perl Artistic License
           perlgpl             GNU General Public License

   Language-Specific
           perlcn              Perl for Simplified Chinese (in EUC-CN)
           perljp              Perl for Japanese (in EUC-JP)
           perlko              Perl for Korean (in EUC-KR)
           perltw              Perl for Traditional Chinese (in Big5)

   Platform-Specific
           perlaix             Perl notes for AIX
           perlamiga           Perl notes for AmigaOS
           perlandroid         Perl notes for Android
           perlbs2000          Perl notes for POSIX-BC BS2000
           perlcygwin          Perl notes for Cygwin
           perldos             Perl notes for DOS
           perlfreebsd         Perl notes for FreeBSD
           perlhaiku           Perl notes for Haiku
           perlhpux            Perl notes for HP-UX
           perlhurd            Perl notes for Hurd
           perlirix            Perl notes for Irix
           perllinux           Perl notes for Linux
           perlmacos           Perl notes for Mac OS (Classic)
           perlmacosx          Perl notes for Mac OS X
           perlnetware         Perl notes for NetWare
           perlopenbsd         Perl notes for OpenBSD
           perlos2             Perl notes for OS/2
           perlos390           Perl notes for OS/390
           perlos400           Perl notes for OS/400
           perlplan9           Perl notes for Plan 9
           perlqnx             Perl notes for QNX
           perlriscos          Perl notes for RISC OS
           perlsolaris         Perl notes for Solaris
           perlsymbian         Perl notes for Symbian
           perlsynology        Perl notes for Synology
           perltru64           Perl notes for Tru64
           perlvms             Perl notes for VMS
           perlvos             Perl notes for Stratus VOS
           perlwin32           Perl notes for Windows

   Stubs for Deleted Documents
           perlboot
           perlbot
           perlrepository
           perltodo
           perltooc
           perltoot

       On Debian systems, you need to install the perl-doc package which contains the majority of the standard
       Perl documentation and the perldoc program.

       Extensive additional documentation for Perl modules is available, both those distributed with Perl and
       third-party modules which are packaged or locally installed.

       You should be able to view Perl's documentation with your man(1) program or perldoc(1).

       Some documentation is not available as man pages, so if a cross-reference is not found by man, try it
       with perldoc.  Perldoc can also take you directly to documentation for functions (with the -f switch).
       See "perldoc --help" (or "perldoc perldoc" or "man perldoc") for other helpful options perldoc has to
       offer.

       In general, if something strange has gone wrong with your program and you're not sure where you should
       look for help, try making your code comply with use strict and use warnings.  These will often point
       out exactly where the trouble is.

DESCRIPTION
       Perl officially stands for Practical Extraction and Report Language, except when it doesn't.

       Perl was originally a language optimized for scanning arbitrary text files, extracting information from
       those text files, and printing reports based on that information.  It quickly became a good language
       for many system management tasks. Over the years, Perl has grown into a general-purpose programming
       language. It's widely used for everything from quick "one-liners" to full-scale application
       development.

       The language is intended to be practical (easy to use, efficient, complete) rather than beautiful
       (tiny, elegant, minimal).  It combines (in the author's opinion, anyway) some of the best features of
       sed, awk, and sh, making it familiar and easy to use for Unix users to whip up quick solutions to
       annoying problems.  Its general-purpose programming facilities support procedural, functional, and
       object-oriented programming paradigms, making Perl a comfortable language for the long haul on major
       projects, whatever your bent.

       Perl's roots in text processing haven't been forgotten over the years.  It still boasts some of the
       most powerful regular expressions to be found anywhere, and its support for Unicode text is world-
       class.  It handles all kinds of structured text, too, through an extensive collection of extensions.
       Those libraries, collected in the CPAN, provide ready-made solutions to an astounding array of
       problems.  When they haven't set the standard themselves, they steal from the best -- just like Perl
       itself.

AVAILABILITY
       Perl is available for most operating systems, including virtually all Unix-like platforms.  See
       "Supported Platforms" in perlport for a listing.

ENVIRONMENT
       See "ENVIRONMENT" in perlrun.

AUTHOR
       Larry Wall <larry@wall.org>, with the help of oodles of other folks.

       If your Perl success stories and testimonials may be of help to others who wish to advocate the use of
       Perl in their applications, or if you wish to simply express your gratitude to Larry and the Perl
       developers, please write to perl-thanks@perl.org .

FILES
        "@INC"                 locations of perl libraries

       "@INC" above is a reference to the built-in variable of the same name; see perlvar for more
       information.

SEE ALSO
        https://www.perl.org/       the Perl homepage
        https://www.perl.com/       Perl articles
        https://www.cpan.org/       the Comprehensive Perl Archive
        https://www.pm.org/         the Perl Mongers

DIAGNOSTICS
       Using the "use strict" pragma ensures that all variables are properly declared and prevents other
       misuses of legacy Perl features.

       The "use warnings" pragma produces some lovely diagnostics. One can also use the -w flag, but its use
       is normally discouraged, because it gets applied to all executed Perl code, including that not under
       your control.

       See perldiag for explanations of all Perl's diagnostics.  The "use diagnostics" pragma automatically
       turns Perl's normally terse warnings and errors into these longer forms.

       Compilation errors will tell you the line number of the error, with an indication of the next token or
       token type that was to be examined.  (In a script passed to Perl via -e switches, each -e is counted as
       one line.)

       Setuid scripts have additional constraints that can produce error messages such as "Insecure
       dependency".  See perlsec.

       Did we mention that you should definitely consider using the use warnings pragma?

BUGS
       The behavior implied by the use warnings pragma is not mandatory.

       Perl is at the mercy of your machine's definitions of various operations such as type casting, atof(),
       and floating-point output with sprintf().

       If your stdio requires a seek or eof between reads and writes on a particular stream, so does Perl.
       (This doesn't apply to sysread() and syswrite().)

       While none of the built-in data types have any arbitrary size limits (apart from memory size), there
       are still a few arbitrary limits:  a given variable name may not be longer than 251 characters.  Line
       numbers displayed by diagnostics are internally stored as short integers, so they are limited to a
       maximum of 65535 (higher numbers usually being affected by wraparound).

       You may submit your bug reports (be sure to include full configuration information as output by the
       myconfig program in the perl source tree, or by "perl -V") to <https://github.com/Perl/perl5/issues>.

       Perl actually stands for Pathologically Eclectic Rubbish Lister, but don't tell anyone I said that.

NOTES
       The Perl motto is "There's more than one way to do it."  Divining how many more is left as an exercise
       to the reader.

       The three principal virtues of a programmer are Laziness, Impatience, and Hubris.  See the Camel Book
       for why.

perl v5.32.1                                      2021-09-24                                           PERL(1)

$ man sed
$ man sed > sed-docs.md

$ cat ./sed-docs.md

SED(1)                                           User Commands                                          SED(1)

NAME
       sed - stream editor for filtering and transforming text

SYNOPSIS
       sed [OPTION]... {script-only-if-no-other-script} [input-file]...

DESCRIPTION
       Sed  is  a  stream  editor.   A stream editor is used to perform basic text transformations on an input
       stream (a file or input from a pipeline).  While in some  ways  similar  to  an  editor  which  permits
       scripted  edits  (such as ed), sed works by making only one pass over the input(s), and is consequently
       more efficient.  But it is sed's ability to filter text in a pipeline which particularly  distinguishes
       it from other types of editors.

       -n, --quiet, --silent

              suppress automatic printing of pattern space

       --debug

              annotate program execution

       -e script, --expression=script

              add the script to the commands to be executed

       -f script-file, --file=script-file

              add the contents of script-file to the commands to be executed

       --follow-symlinks

              follow symlinks when processing in place

       -i[SUFFIX], --in-place[=SUFFIX]

              edit files in place (makes backup if SUFFIX supplied)

       -l N, --line-length=N

              specify the desired line-wrap length for the `l' command

       --posix

              disable all GNU extensions.

       -E, -r, --regexp-extended

              use extended regular expressions in the script (for portability use POSIX -E).

       -s, --separate

              consider files as separate rather than as a single, continuous long stream.

       --sandbox

              operate in sandbox mode (disable e/r/w commands).

       -u, --unbuffered

              load minimal amounts of data from the input files and flush the output buffers more often

       -z, --null-data

              separate lines by NUL characters

       --help
              display this help and exit

       --version
              output version information and exit

       If  no  -e, --expression, -f, or --file option is given, then the first non-option argument is taken as
       the sed script to interpret.  All remaining arguments are names of input files; if no input  files  are
       specified, then the standard input is read.

       GNU   sed   home   page:   <https://www.gnu.org/software/sed/>.    General  help  using  GNU  software:
       <https://www.gnu.org/gethelp/>.  E-mail bug reports to: <bug-sed@gnu.org>.

COMMAND SYNOPSIS
       This is just a brief synopsis of sed commands to serve as a reminder to those  who  already  know  sed;
       other documentation (such as the texinfo document) must be consulted for fuller descriptions.

   Zero-address ``commands''
       : label
              Label for b and t commands.

       #comment
              The comment extends until the next newline (or the end of a -e script fragment).

       }      The closing bracket of a { } block.

   Zero- or One- address commands
       =      Print the current line number.

       a \

       text   Append text, which has each embedded newline preceded by a backslash.

       i \

       text   Insert text, which has each embedded newline preceded by a backslash.

       q [exit-code]
              Immediately  quit the sed script without processing any more input, except that if auto-print is
              not disabled the current pattern space will be printed.  The exit code argument is a GNU  exten‐
              sion.

       Q [exit-code]
              Immediately quit the sed script without processing any more input.  This is a GNU extension.

       r filename
              Append text read from filename.

       R filename
              Append  a  line  read from filename.  Each invocation of the command reads a line from the file.
              This is a GNU extension.

   Commands which accept address ranges
       {      Begin a block of commands (end with a }).

       b label
              Branch to label; if label is omitted, branch to end of script.

       c \

       text   Replace the selected lines with text, which has each embedded newline preceded by a backslash.

       d      Delete pattern space.  Start next cycle.

       D      If pattern space contains no newline, start a normal new cycle as if the d command  was  issued.
              Otherwise,  delete text in the pattern space up to the first newline, and restart cycle with the
              resultant pattern space, without reading a new line of input.

       h H    Copy/append pattern space to hold space.

       g G    Copy/append hold space to pattern space.

       l      List out the current line in a ``visually unambiguous'' form.

       l width
              List out the current line in a ``visually unambiguous'' form, breaking it at  width  characters.
              This is a GNU extension.

       n N    Read/append the next line of input into the pattern space.

       p      Print the current pattern space.

       P      Print up to the first embedded newline of the current pattern space.

       s/regexp/replacement/
              Attempt  to match regexp against the pattern space.  If successful, replace that portion matched
              with replacement.  The replacement may contain the special character & to refer to that  portion
              of the pattern space which matched, and the special escapes \1 through \9 to refer to the corre‐
              sponding matching sub-expressions in the regexp.

       t label
              If a s/// has done a successful substitution since the last input line was read  and  since  the
              last t or T command, then branch to label; if label is omitted, branch to end of script.

       T label
              If  no  s/// has done a successful substitution since the last input line was read and since the
              last t or T command, then branch to label; if label is omitted, branch to end of  script.   This
              is a GNU extension.

       w filename
              Write the current pattern space to filename.

       W filename
              Write the first line of the current pattern space to filename.  This is a GNU extension.

       x      Exchange the contents of the hold and pattern spaces.

       y/source/dest/
              Transliterate  the  characters  in the pattern space which appear in source to the corresponding
              character in dest.

Addresses
       Sed commands can be given with no addresses, in which case the command will be executed for  all  input
       lines;  with  one  address, in which case the command will only be executed for input lines which match
       that address; or with two addresses, in which case the command will be executed  for  all  input  lines
       which  match  the inclusive range of lines starting from the first address and continuing to the second
       address.  Three things to note about address ranges: the syntax is addr1,addr2 (i.e., the addresses are
       separated  by  a comma); the line which addr1 matched will always be accepted, even if addr2 selects an
       earlier line; and if addr2 is a regexp, it will not be tested against the line that addr1 matched.

       After the address (or address-range), and before the command, a !  may  be  inserted,  which  specifies
       that the command shall only be executed if the address (or address-range) does not match.

       The following address types are supported:

       number Match  only the specified line number (which increments cumulatively across files, unless the -s
              option is specified on the command line).

       first~step
              Match every step'th line starting with line first.  For example, ``sed -n 1~2p'' will print  all
              the  odd-numbered  lines  in  the input stream, and the address 2~5 will match every fifth line,
              starting with the second.  first can be zero; in this case, sed operates as if it were equal  to
              step.  (This is an extension.)

       $      Match the last line.

       /regexp/
              Match  lines  matching the regular expression regexp.  Matching is performed on the current pat‐
              tern space, which can be modified with commands such as ``s///''.

       \cregexpc
              Match lines matching the regular expression regexp.  The c may be any character.

       GNU sed also supports some special 2-address forms:

       0,addr2
              Start out in "matched first address" state, until addr2 is found.  This is similar  to  1,addr2,
              except that if addr2 matches the very first line of input the 0,addr2 form will be at the end of
              its range, whereas the 1,addr2 form will still be at the beginning of  its  range.   This  works
              only when addr2 is a regular expression.

       addr1,+N
              Will match addr1 and the N lines following addr1.

       addr1,~N
              Will  match addr1 and the lines following addr1 until the next line whose input line number is a
              multiple of N.

REGULAR EXPRESSIONS
       POSIX.2 BREs should be supported, but they aren't completely because of performance problems.   The  \n
       sequence in a regular expression matches the newline character, and similarly for \a, \t, and other se‐
       quences.  The -E option switches to using extended regular expressions instead; it has  been  supported
       for years by GNU sed, and is now included in POSIX.

BUGS
       E-mail  bug  reports  to  bug-sed@gnu.org.  Also, please include the output of ``sed --version'' in the
       body of your report if at all possible.

AUTHOR
       Written by Jay Fenlason, Tom Lord, Ken Pizzini, Paolo Bonzini, Jim Meyering, and Assaf Gordon.  GNU sed
       home     page:    <https://www.gnu.org/software/sed/>.     General    help    using    GNU    software:
       <https://www.gnu.org/gethelp/>.  E-mail bug reports to: <bug-sed@gnu.org>.

COPYRIGHT
       Copyright © 2018  Free  Software  Foundation,  Inc.   License  GPLv3+:  GNU  GPL  version  3  or  later
       <https://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent
       permitted by law.

SEE ALSO
       awk(1), ed(1), grep(1), tr(1), perlre(1), sed.info, any of various books on sed, the sed FAQ
       (http://sed.sf.net/grabbag/tutorials/sedfaq.txt), http://sed.sf.net/grabbag/.

       The full documentation for sed is maintained as a Texinfo manual.  If the info and sed programs are
       properly installed at your site, the command

              info sed

       should give you access to the complete manual.

sed 4.7                                          December 2018                                          SED(1)