gawk: add GNU version of awk

[Managor]

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page(s) have at most 8 examples.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The page(s) follow the style guide.
• The PR title conforms to the recommended templates.
• Version of the command being documented (if known):

[fazlearefin]

On a freshly installed Debian 12, awk is not GNU awk, but mawk. I believe so is the case in Ubuntu and Pop_OS as well. Once the package gawk installed, awk then points to GNU awk.

So I think this page should be named gawk.md.

user@debian-12-vbox:~$ which awk
/usr/bin/awk
user@debian-12-vbox:~$ dpkg -S /usr/bin/awk
dpkg-query: no path found matching pattern /usr/bin/awk
user@debian-12-vbox:~$ ls -l /usr/bin/awk
lrwxrwxrwx 1 root root 21 Jun 18  2022 /usr/bin/awk -> /etc/alternatives/awk
user@debian-12-vbox:~$ ls -l /etc/alternatives/awk
lrwxrwxrwx 1 root root 13 Jun 18  2022 /etc/alternatives/awk -> /usr/bin/mawk
user@debian-12-vbox:~$
user@debian-12-vbox:~$
user@debian-12-vbox:~$ sudo apt install gawk -y &>/dev/null
[sudo] password for user:
user@debian-12-vbox:~$
user@debian-12-vbox:~$ which awk
/usr/bin/awk
user@debian-12-vbox:~$ ls -l /usr/bin/awk
lrwxrwxrwx 1 root root 21 Jun 18  2022 /usr/bin/awk -> /etc/alternatives/awk
user@debian-12-vbox:~$ ls -l /etc/alternatives/awk
lrwxrwxrwx 1 root root 13 May 14 22:40 /etc/alternatives/awk -> /usr/bin/gawk
user@debian-12-vbox:~$

@acuteenvy What are your thoughts on this?

[Managor]

I think that's a pretty clear and cut case

[tldr-bot]

Hello! I've noticed something unusual when checking this PR:

• The page pages/common/gawk.md seems to be a copy of pages/common/awk.md (80% matching).

Is this intended? If so, just ignore this comment. Otherwise, please double-check the commits.