text: 
  Busybox POSIX conformance table
  
  See POSIX documentation (1003.1-2008) here:
  http://www.opengroup.org/onlinepubs/9699919799/
  And the complete list of all utilities that POSIX covers:
  http://www.opengroup.org/onlinepubs/9699919799/idx/utilities.html
  
  This listing is a work in progress, and currently only covers
  tool options (not operands, environment variables, return codes, etc..).
  For each option it is set if it (a) exists and (b) compliant to POSIX 2008.
  Some options exist but there is no value in the 'compliant' column: that
  means no one has yet bothered to make sure that the option does what it is
  required to do.
  
  -----------------------------------------------
  
  POSIX Tools supported only as shell built-ins (ash shell):
    alias, bg, cd, fg, getopts, hash, jobs, read, type, umask, ulimit,
    unalias, wait, write
  
  POSIX Tools not supported:
    asa, at, batch, bc, c99, command, compress, csplit, ex, fc, file,
    gencat, getconf, iconv, join, link, locale, localedef, lp, m4,
    mailx, newgrp, nl, paste, pathchk, pax, pr, qalter, qdel, qhold, qmove,
    qmsg, qrerun, qrls, qselect, qsig, qstat, qsub, tabs, talk, tput,
    tsort, unlink, uucp, uustat, uux
  
  POSIX Tools not supported (DEVELOPMENT):
    admin, cflow, ctags, cxref, delta, fort77, get, lex, make, nm, prs, rmdel,
    sact, sccs, strip, unget, val, what, yacc
  
  
  POSIX Tools supported:
  
  Note: echo, printf, kill, pwd documented here as stand-alone applets,
        not as ash built-ins.
  
  
  ar POSIX options ********************* Failed to recognize zip & tar (did not compare to regular ar)
   option           | exists | compliant | remarks
    -C              |  no    | no        |
    -T              |  no    | no        |
    -a              |  no    | no        |
    -b              |  no    | no        |
    -c              |  no    | no        |
    -d              |  no    | no        |
    -i              |  no    | no        |
    -m              |  no    | no        |
    -p              |  yes   |           |
    -q              |  no    | no        |
    -r              |  no    | no        |
    -s              |  no    | no        |
    -t              |  yes   |           |
    -u              |  no    | no        |
    -v              |  yes   |           |
    -x              |  yes   |           |
  ar Busybox specific options:
    -o
  
  awk POSIX options
   option           | exists | compliant | remarks
    -F ERE          |  yes   |           |
    -f progfile     |  yes   |           |
    -v assignment   |  yes   |           |
  awk Busybox specific options: None
  
  basename POSIX options: None
  basename Busybox specific options: None
  
  cal POSIX options: None
  cal Busybox specific options:
    -y, -j
  
  cat POSIX options
   option           | exists | compliant | remarks
    -u              |  yes   | no        | option is ignored
  cat Busybox specific options: None
  
  chgrp POSIX options
   option           | exists | compliant | remarks
    -H              |  yes   |           |
    -L              |  yes   |           |
    -P              |  yes   |           |
    -R              |  yes   |           |
    -h              |  yes   |           |
  chgrp Busybox specific options:
    -f, -c, -v
  
  chmod POSIX options
   option           | exists | compliant | remarks
    -R              |  yes   | yes       |
  chmod Busybox specific options:
    -f, -v, -c
  
  chown POSIX options *********************************************
   option           | exists | compliant | remarks
    -H              |  yes   |           | It seems like all flags are supported (according to printout), but
    -L              |  yes   |           |  it fails to work on my machine
    -P              |  yes   |           |
    -R              |  yes   |           |
    -h              |  yes   |           |
  chown Busybox specific options:
    -f, -c, -v
  
  cksum POSIX options: None
  cksum Busybox specific options: None
  
  cmp POSIX options
   option           | exists | compliant | remarks
    -l              |  yes   | yes       |
    -s              |  yes   | yes       |
  cmp Busybox specific options:
  
  
  comm POSIX options
   option           | exists | compliant | remarks
    -1              |  yes   | yes       |
    -2              |  yes   | yes       |
    -3              |  yes   | yes       |
  comm Busybox specific options: None
  
  cp POSIX options
   option           | exists | compliant | remarks
    -H              |  yes   | yes       |
    -L              |  yes   | yes       |
    -P              |  yes   | yes       |
    -R              |  yes   | yes       |
    -f              |  yes   | yes       |
    -i              |  yes   | yes       |
    -p              |  yes   | yes       |
  cp Busybox specific options:
    -d, -a, -s, -c, -r, -l
  
  crontab POSIX options
   option           | exists | compliant | remarks
    -e              |  yes   |           |
    -l              |  yes   |           |
    -r              |  yes   |           |
  crontab Busybox specific options:
    -u, -c
  
  cut POSIX options
   option           | exists | compliant | remarks
    -b list         |  yes   | yes       |
    -c list         |  yes   | yes       |
    -d delim        |  yes   | yes       |
    -f list         |  yes   | yes       |
    -n              |  yes   | yes       |
    -s              |  yes   | yes       |
  cut Busybox specific options: None
  
  date POSIX options
   option           | exists | compliant | remarks
    -u              |  yes   | yes       |
  date Busybox specific options:
    -I[SPEC], -d TIME, -r FILE, -R, -D FMT
  
  dd POSIX options:
   option           | exists | compliant | remarks
    if              |  yes   |           |
    of              |  yes   |           |
    ibs             |  yes   |           |
    obs             |  yes   |           |
    bs              |  yes   |           |
    cbs             |  no    | no        |
    skip            |  yes   |           |
    seek            |  yes   |           |
    count           |  yes   |           |
    conv=ascii      |  no    | no        |
    conv=ebcdic     |  no    | no        |
    conv=ibm        |  no    | no        |
    conv=block      |  no    | no        |
    conv=unblock    |  no    | no        |
    conv=lcase      |  no    | no        |
    conv=ucase      |  no    | no        |
    conv=swap       |  no    | no        |
    conv=noerror    |  yes   |           |
    conv=notrunc    |  yes   |           |
    conv=sync       |  yes   |           |
  dd Busybox specific options:
   conv=fsync
  
  df POSIX options
   option           | exists | compliant | remarks
    -P              |  yes   | yes       |
    -k              |  yes   | yes       |
    -t              |  no    | no        |
  df Busybox specific options:
    -a, -m, -B SIZE, -i, -h
  Remark:
  - It seems that GNU df does not round percents up in its output (thus its results are a bit different)
  
  diff POSIX options
   option           | exists | compliant | remarks
    -C n            |  no    | no        |
    -U n            |  yes   |           |
    -b              |  yes   |           |
    -c              |  no    | no        |
    -e              |  no    | no        |
    -f              |  no    | no        |
    -r              |  yes   |           |
    -u              |  no    | no        |
  diff Busybox specific options:
    -d, -a, -s, -t, -L, -N, -i, -T, -w, -q, -S
  
  dirname POSIX options: None
  dirname Busybox specific options: None
  
  du POSIX options
   option           | exists | compliant | remarks
    -H              |  yes   |           |
    -L              |  yes   |           |
    -a              |  yes   |           |
    -k              |  yes   |           |
    -s              |  yes   |           |
    -x              |  yes   |           |
  du Busybox specific options:
    -c, -m, -h, -d N, -l
  
  
  echo POSIX options: None
   option           | exists | compliant | remarks
    -n              |  yes   | yes       | The result of -n is "implementation-defined"
  echo Busybox specific options:
    -e, -E
  
  ed POSIX options
   option           | exists | compliant | remarks
    -p string       |  no    | no        |
    -s              |  no    | no        |
  ed Busybox specific options: None
  
  env POSIX options
   option           | exists | compliant | remarks
    -i              |  no    | no        |
  env Busybox specific options:
    -u, -,  -i
  
  expand POSIX options
   option           | exists | compliant | remarks
    -t tablist      |  yes   | yes       |
  expand Busybox specific options:
    --tabs=N, -i, --initial
  
  expr POSIX operations:
   option           | exists | compliant | remarks
    |               |  yes   |  yes      |
    &               |  yes   |  yes      |
    =               |  yes   |  yes      |
    >               |  yes   |  yes      |
    >=              |  yes   |  yes      |
    <=              |  yes   |  yes      |
    <               |  yes   |  yes      |
    !=              |  yes   |  yes      |
    +               |  yes   |  yes      |
    -               |  yes   |  yes      |
    *               |  yes   |  yes      |
    /               |  yes   |  yes      |
    %               |  yes   |  yes      |
    :               |  yes   |  yes      |
    (expr)          |  yes   |  yes      |
    integer         |  yes   |  yes      |
    string          |  yes   |  yes      |
  expr Busybox specific operations:
    match, substr, index, length, quote
  
  false POSIX options: None
  false Busybox specific options: None
  
  find POSIX options
   option           | exists | compliant | remarks
    -H              |  no    | no        |
    -L              |  no    | no        |
  find Busybox specific options:
    -group NAME, -mtime DAYS, -print, -maxdepth N, -exec CMD ARG ;, -newer FILE, -context, -iname PATTERN, -follow, -depth, -xdev, -inum N, -type X, -print0, -mindepth N, -mmin MINS, -regex PATTERN, -prune, -path PATTERN, -user NAME, -delete, -perm NNN, -name PATTERN, -size N[bck]
  
  fold POSIX options
   option           | exists | compliant | remarks
    -b              |  yes   | yes       |
    -s              |  yes   | yes       |
    -w width        |  yes   | yes       |
  fold Busybox specific options: None
  
  fuser POSIX options
   option           | exists | compliant | remarks
    -c              |  no    | no        |
    -f              |  no    | no        |
    -u              |  no    | no        |
  fuser Busybox specific options:
    -m, -k, -4, -SIGNAL, -6, -s
  
  grep POSIX options
   option           | exists | compliant | remarks
    -E              |  yes   |           |
    -F              |  yes   |           |
    -c              |  yes   |           |
    -e pattern_list |  yes   |           |
    -f pattern_file |  yes   |           |
    -i              |  yes   |           |
    -l              |  yes   |           |
    -n              |  yes   |           |
    -q              |  yes   |           |
    -s              |  yes   |           |
    -v              |  yes   |           |
    -x              |  no    | no        |
  grep Busybox specific options:
    -A, -C, -B, -L, -H, -o, -h, -w, -r, -z, -m MAX
  
  head POSIX options
   option           | exists | compliant | remarks
    -n number       |  yes   | yes       |
  head Busybox specific options:
    -v, -c NUM, -q
  
  id POSIX options
   option           | exists | compliant | remarks
    -G              |  yes   | yes       |
    -g              |  yes   | yes       |
    -n              |  yes   | yes       |
    -r              |  yes   | yes       |
    -u              |  yes   | yes       |
  id Busybox specific options:
    -Z
  
  ipcrm POSIX options
   option           | exists | compliant | remarks
    -M shmkey       |  no    | no        |
    -Q msgkey       |  no    | no        |
    -S semkey       |  no    | no        |
    -m shmid        |  no    | no        |
    -q msgid        |  no    | no        |
    -s semid        |  no    | no        |
  ipcrm Busybox specific options:
    -mM, -qQ, -sS
  
  ipcs POSIX options
   option           | exists | compliant | remarks
    -a              |  yes   |           |
    -b              |  no    | no        |
    -c              |  yes   |           |
    -m              |  yes   |           |
    -o              |  no    | no        |
    -p              |  yes   |           |
    -q              |  yes   |           |
    -s              |  yes   |           |
    -t              |  yes   |           |
  ipcs Busybox specific options:
    -l, -i, -u
  
  kill POSIX options
   option           | exists | compliant | remarks
    -l              |  yes   | yes       |
    -s signal_name  |  yes   | yes       |
    -signal_name    |  yes   | yes       |
    -signal_number  |  yes   | yes       |
  kill Busybox specific options:
     -q, -o
  
  ln POSIX options
   option           | exists | compliant | remarks
    -L              |  no    | no        |
    -P              |  no    | no        |
    -f              |  yes   | yes       |
    -s              |  yes   | yes       |
  ln Busybox specific options:
    -S suf, -n, -b
  
  logger POSIX options: None
  logger Busybox specific options:
    -p PRIO, -t TAG, -s
  
  logname POSIX options: None
  logname Busybox specific options: None
  
  ls POSIX options
   option           | exists | compliant | remarks
    -1              |  yes   | yes       |
    -A              |  yes   | yes       |
    -C              |  yes   | yes       |
    -F              |  yes   | yes       | And more: '=' for sockets (not defined by POSIX)
    -H              |  no    | no        |
    -L              |  yes   | yes       | But coloring may be wrong (at least POSIX does not require correct colors :) )
    -R              |  yes   | yes       |
    -S              |  yes   | yes       |
    -a              |  yes   | yes       |
    -c              |  yes   | no        | Sorts output with '-l' (should only show ctime with '-l', and sort only with '-t')
    -d              |  yes   | no        | When invoked together with '-L' should read symbolic links, and doesn't
    -f              |  no    | no        |
    -g              |  no    | no        |
    -i              |  yes   | yes       |
    -k              |  yes   | no        | Does something completely unrelated! (Lists security context instead of specifying block size)
    -l              |  yes   | yes       |
    -m              |  no    | no        |
    -n              |  yes   | no        | Works correctly only together with '-l' (but POSIX requires '-l' to be implicitly assumed)
    -o              |  no    | no        |
    -p              |  yes   | yes       |
    -q              |  no    | no        |
    -r              |  yes   | yes       |
    -s              |  yes   | yes       |
    -t              |  yes   | yes       |
    -u              |  yes   | yes       |
    -x              |  yes   | yes       |
  ls Busybox specific options:
    --color, -T NUM, -K, -X, -Z, -e, -h, -v, -w NUM
  
  man POSIX options
   option           | exists | compliant | remarks
    -k              |  no    | no        |
  man Busybox specific options:
    -a      Display all pages
  
  
  mesg POSIX options: None
  mesg Busybox specific options: None
  
  mkdir POSIX options
   option           | exists | compliant | remarks
    -m mode         |  yes   | yes       |
    -p              |  yes   | yes       |
  mkdir Busybox specific options:
    -Z
  
  mkfifo POSIX options
   option           | exists | compliant | remarks
    -m mode         |  yes   | yes       |
  mkfifo Busybox specific options:
    -Z
  
  more POSIX options
   option           | exists | compliant | remarks
    -c              |  no    | no        |
    -e              |  no    | no        |
    -i              |  no    | no        |
    -n number       |  no    | no        |
    -p command      |  no    | no        |
    -s              |  no    | no        |
    -t tagstring    |  no    | no        |
    -u              |  no    | no        |
  more Busybox specific options: None
  
  mv POSIX options
   option           | exists | compliant | remarks
    -f              |  yes   | yes       |
    -i              |  yes   | yes       |
  mv Busybox specific options: None
  
  nice POSIX options
   option           | exists | compliant | remarks
    -n increment    |  yes   | yes       |
  nice Busybox specific options: None
  
  nohup POSIX options: None
  nohup Busybox specific options: None
  
  od POSIX options
   option           | exists | compliant | remarks
    -A address_base |  no    | no        |
    -N count        |  no    | no        |
    -b              |  no    | no        |
    -c              |  no    | no        |
    -d              |  no    | no        |
    -j skip         |  no    | no        |
    -o              |  no    | no        |
    -s              |  no    | no        |
    -t type_string  |  no    | no        |
    -v              |  no    | no        |
    -x              |  no    | no        |
  od Busybox specific options: None
  
  patch POSIX options
   option           | exists | compliant | remarks
    -D define       |  no    | no        |
    -N              |  no    | no        |
    -R              |  yes   | yes       |
    -b              |  no    | no        |
    -c              |  no    | no        |
    -d dir          |  no    | no        |
    -e              |  no    | no        |
    -i patchfile    |  yes   | yes       |
    -l              |  no    | no        |
    -n              |  no    | no        |
    -o outfile      |  no    | no        |
    -p num          |  yes   | yes       |
    -r rejectfile   |  no    | no        |
    -u              |  no    | no        |
  patch Busybox specific options: None
  
  printf POSIX options: None
  printf Busybox specific options: None
  
  ps POSIX options
   option           | exists | compliant | remarks
    -A              |  no    | no        |
    -G grouplist    |  no    | no        |
    -U userlist     |  no    | no        |
    -a              |  no    | no        |
    -d              |  no    | no        |
    -e              |  no    | no        |
    -f              |  no    | no        |
    -g grouplist    |  no    | no        |
    -l              |  no    | no        |
    -n namelist     |  no    | no        |
    -o format       |  yes   | no        | not supported: ruser, group, rgroup, pcpu
    -p proclist     |  no    | no        |
    -t termlist     |  no    | no        |
    -u userlist     |  no    | no        |
  ps Busybox specific options: None
  
  pwd POSIX options
   option           | exists | compliant | remarks
    -L              |  no    | no        |
    -P              |  no    | no        |
  pwd Busybox specific options: None
  
  renice POSIX options
   option           | exists | compliant | remarks
    -g              |  yes   | yes       |
    -n increment    |  yes   | yes       | Note POSIX allows only to run with this option (busybox also allows to run without '-n' and set niceness directly)
    -p              |  yes   | yes       |
    -u              |  yes   | yes       |
  renice Busybox specific options: None
  
  rm POSIX options
   option           | exists | compliant | remarks
    -R              |  yes   | yes       |
    -f              |  yes   | yes       |
    -i              |  yes   | yes       |
    -r              |  yes   | yes       |
  rm Busybox specific options: None
  
  rmdir POSIX options
   option           | exists | compliant | remarks
    -p              |  yes   | yes       |
  rmdir Busybox specific options:
    --parents
  
  sed POSIX options
   option           | exists | compliant | remarks
    -e script       |  yes   |           |
    -f script_file  |  yes   |           |
    -n              |  yes   |           |
  sed Busybox specific options:
    -i, -r
  
  sh POSIX options
   option           | exists | compliant | remarks
    -c              |  no    | no        |
    -i              |  no    | no        |
    -s              |  no    | no        |
  sh Busybox specific options: None
  
  sleep POSIX options: None
  sleep Busybox specific options: None
  
  sort POSIX options
   option           | exists | compliant | remarks
    -C              |  no    | no        |
    -b              |  yes   | yes       |
    -c              |  yes   | yes       |
    -d              |  yes   | yes       |
    -f              |  yes   | yes       |
    -i              |  yes   | yes       | But is not like GNU sort, which isn't! (try to sort 'a\nA\nB\nb' with and without -f)
    -k keydef       |  yes   |           |
    -m              |  no    | no        |
    -n              |  yes   | yes       |
    -o output       |  yes   | yes       |
    -r              |  yes   | yes       |
    -t char         |  yes   |           |
    -u              |  yes   | yes       |
  sort Busybox specific options:
    -mST, -g, -M, -s, -z
  
  split POSIX options
   option           | exists | compliant | remarks
    -a suffix_length |  yes   | yes       |
    -b n            |  yes   | yes       |
    -b nk           |  yes   | yes       |
    -b nm           |  yes   | yes       |
    -l line_count   |  yes   | yes       |
  split Busybox specific options: None
  
  strings POSIX options
   option           | exists | compliant | remarks
    -a              |  yes   | yes       |
    -n number       |  yes   | yes       |
    -t format       |  no    | no        |
  strings Busybox specific options:
    -o, -f
  
  stty POSIX options
   option           | exists | compliant | remarks
    -a              |  yes   | yes       |
    -g              |  yes   | yes       |
  stty Busybox specific options:
    -F DEVICE
  
  tail POSIX options
   option           | exists | compliant | remarks
    -c number       |  yes   | yes       |
    -f              |  yes   | yes       |
    -n number       |  yes   | yes       |
  tail Busybox specific options:
    -v, -q, -s SEC
  
  tee POSIX options
   option           | exists | compliant | remarks
    -a              |  yes   | yes       |
    -i              |  yes   | yes       |
  tee Busybox specific options: None
  
  test POSIX options: None
  test Busybox specific options: None
  
  time POSIX options
   option           | exists | compliant | remarks
    -p              |  no    | no        |
  time Busybox specific options:
    -v
  
  touch POSIX options
   option           | exists | compliant | remarks
    -a              |  no    | no        |
    -c              |  yes   | yes       |
    -d date_time    |  no    | no        |
    -m              |  no    | no        |
    -r ref_file     |  no    | no        |
    -t time         |  no    | no        |
  touch Busybox specific options: None
  
  tr POSIX options
   option           | exists | compliant | remarks
    -C              |  no    | no        |
    -c              |  yes   | yes       |
    -d              |  yes   | yes       |
    -s              |  yes   | yes       |
  tr Busybox specific options: None
  
  true POSIX options: None
  true Busybox specific options: None
  
  tty POSIX options: None
  tty Busybox specific options:
    -s
  
  uname POSIX options
   option           | exists | compliant | remarks
    -a              |  yes   | yes       |
    -m              |  yes   | yes       |
    -n              |  yes   | yes       |
    -r              |  yes   | yes       |
    -s              |  yes   | yes       |
    -v              |  yes   | yes       |
  uname Busybox specific options:
    -p
  
  uncompress POSIX options
   option           | exists | compliant | remarks
    -c              |  yes   | yes       |
    -f              |  yes   | yes       |
    -v              |  no    | no        |
  uncompress Busybox specific options: None
  
  unexpand POSIX options
   option           | exists | compliant | remarks
    -a              |  yes   | no        | POSIX requires converting two or more spaces to tabs, busybox converts one or more spaces
    -t tablist      |  yes   | yes       |
  unexpand Busybox specific options:
    --tabs=N, -f, --first-only, --all
  
  uniq POSIX options
   option           | exists | compliant | remarks
    -c              |  yes   | yes       |
    -d              |  yes   | yes       |
    -f fields       |  yes   | yes       |
    -s chars        |  yes   | yes       |
    -u              |  yes   | yes       |
  uniq Busybox specific options:
    -w N
  
  uudecode POSIX options
   option           | exists | compliant | remarks
    -o outfile      |  no    | no        |
  uudecode Busybox specific options: None
  
  uuencode POSIX options
   option           | exists | compliant | remarks
    -m              |  yes   | yes       |
  uuencode Busybox specific options: None
  
  vi POSIX options
   option           | exists | compliant | remarks
    -R              |  yes   |           |
    -c command      |  yes   |           |
    -r              |  no    | no        |
    -t tagstring    |  no    | no        |
    -w size         |  no    | no        |
  vi Busybox specific options:
    -H
  
  wc POSIX options
   option           | exists | compliant | remarks
    -c              |  yes   | yes       |
    -l              |  yes   | yes       |
    -m              |  no    | no        |
    -w              |  yes   | yes       |
  wc Busybox specific options:
    -L
  
  who POSIX options
   option           | exists | compliant | remarks
    -H              |  no    | no        |
    -T              |  no    | no        |
    -a              |  yes   | no        | just shows all
    -b              |  no    | no        |
    -d              |  no    | no        |
    -l              |  no    | no        |
    -m              |  no    | no        |
    -p              |  no    | no        |
    -q              |  no    | no        |
    -r              |  no    | no        |
    -s              |  no    | no        |
    -t              |  no    | no        |
    -u              |  no    | no        |
  who Busybox specific options: None
  
  xargs POSIX options
   option           | exists | compliant | remarks
    -E eofstr       |  no    | no        |
    -I replstr      |  no    | no        |
    -L number       |  no    | no        |
    -n number       |  yes   | yes       |
    -p              |  yes   | yes       |
    -s size         |  yes   | yes       |
    -t              |  yes   | yes       |
    -x              |  yes   | yes       |
  xargs Busybox specific options:
    -e[STR], -0, -r
  
  zcat POSIX options: None
  zcat Busybox specific options: None
  