SUS/POSIX compliance tracking issue

The Open Group's POSIX.2, a part of the Single UNIX Specification, is the standard for the base shell environment that we seek to document in common. However, there are some commands which don't have a common tldr page yet:

• admin
• asa
• cal → #12172
• cflow
• compress
• csplit
• cxref
• fort77
• fuser
• gencat
• get
• getconf
• getopts
• hash
• ipcrm
• locale
• localedef
• newgrp
• prs
• qalter
• qdel
• qhold
• qmove
• qmsg
• qrerun
• qrls
• qselect
• qsig
• qstat
• qsub
• rmdel
• sact
• sccs
• strip
• tabs
• talk
• uncompress
• unget
• uucp
• uustat
• uux
• val
• what
• yacc

Also, there are many pages in common with unportable flags, so let's manually check them one-by-one, it's not that many:

• alias (the more information is questionable; we should replace the unalias example with a See also)
• ar
• at (-l and -m might be considerations to be added)
• awk (let's add -f and possibly -v)
• basename (last example sucks)
• batch (-f doesn't exist)
• bc (full of wrong crap, only -l exists)
• bg (i don't get why it has a % in there)
• c99 (doesn't conform to path/to/, etc.; could have more options in there)
• cat (only -u exists) → #9623
• cd (could add -L, -P)
• chgrp (--reference doesn't exist)
• chmod (we should really consider including an octal example, the description is really complicated and i'm not sure whether , and X exist)
• chown (--reference doesn't exist)
• cksum ("Note, on old UNIX systems the CRC implementation may differ"? It's clearly defined)
• cmp (long options do not exist, -l and -s do)
• comm (path/to/ missing, i'm not sure if everything works like that, but it looks somewhat fine)
• command (let's add -V and -p)
• cp (-v doesn't exist, -L only exists if -R is also given)
• crontab (-u doesn't exist, also wtf is crontab.guru)
• ctags (will have to look into this, for posix long options don't exist, -a, -f and -x do)
• cut (long options do not exist)
• date (only -u and some +% things exist)
• dd (status=progress does not exist) → #9624, #9816
• delta (name collision)
• df (only -k, -P and -t exist) → #11870
• diff (long options do not exist)
• dirname (--zero doesn't exist)
• du (only -aHkLsx exist)
• echo (May I quote: "Implementations shall not support any options.", -n exists in XSI)
• ed (THERE ARE NO LONG OPTIONS, -p and -s exist)
• env (-u is not real)
• ex (it is not vim)
• expand (only -t exists)
• expr (it looks like half our examples aren't valid expressions)
• false (IT IS NON-ZERO NOT ONE😭) → #9817
• fc (WITHOUT THE -l -r DOESNT LIST IT EDITS)
• fg (same as with bg)
• file (-dhMmih exist)
• find (half the operands dont exist)
• fold (consider a -b example)
• grep (long options aren't supported on non-GNU platforms)
• head (LONG OPTIONS 😭😭😭, THERE IS ONLY -n) → #9818
• iconv (doesn't follow path/to/ convention)
• id (consider including more, -Ggnru are supported)
• ipcs
• jobs (still not sure about %)
• join (doesn't follow path/to/ and ellipsis syntax and could use more options (-aveot12))
• kill (%) → #12044
• lex (long options aren't supported on non-GNU platforms, there is no -o, only -ntv) → #10001
• link
• ln
• logger
• logname
• lp
• ls
• m4
• mailx
• make
• man
• mesg
• mkdir
• mkfifo
• more → #12171
• mv
• nice
• nl (-t is fake; the page is in general kinda crappy imo)
• nm
• nohup
• od
• paste
• patch
• pathchk
• pax
• pr
• printf
• ps
• pwd
• read
• renice
• rm
• rmdir
• sed → #9609
• sh
• sleep
• sort
• split
• strings
• stty
• tail
• tee
• test
• time
• touch
• tput
• tr
• true
• tsort
• tty
• type
• ulimit
• umask
• unalias
• uname
• unexpand
• uniq (maybe -f and -s should be mentioned?)
• unlink
• uudecode
• uuencode
• vi
• wait
• wc
• who
• write
• xargs
• zcat

Of course, you can do, whatever you want to, as long as you can find approving reviewers, but I would suggest to us all the following rules:

• Do not work on this issue if you do not have access to a current version of the spec, you can get it for free from The Open Group/Austin Group, even though it's as hard as they can physically make it.

• Do check against the standard before making any changes, either opening/merging a PR or to the lists above.

• Also, let's replace all links to GNU documentation with something more sensible that is yet to be found. (maybe 1p man pages? or https://pubs.opengroup.org/onlinepubs/9699919799/utilities/false.html)