Posixutils: add posix utilities

[IkerGalardi]

Add most POSIX command line utilities:

Commands:

• basename
  • Basename calculation
  • Optional suffix parameter
• cat
  • Printing multiple files
  • -n flag for showing line numbers
  • -T flag for showing tab character
• chgrp
  • Change the group
  • -R flag for recursivelly changing group
• chmod
  • Change permissions of a file/directory
  • -R flag for recursivelly changing permissions
• chown
  • Change owner of a file/directory
  • -R flag for changing owner recursivelly
• cmp
  • Comparing two files
  • -s flag for not showing anything on stdout
• cp
  • Copying file
  • -i flag for asking if the file should be copied or not
  • -l flag for hard link file
  • -s flag for symbolic linking
  • -R flag for recursive
  • -f flag for forcing the file
• cut
  • -f flag for cut-ing by field
  • -b flag for cut-ing by byte
  • -c flag for cut-ing by character
• date
  • Write date to stdout
• dd
  • Copy file by parts
  • Specify block size
  • Specify block sizes separatelly
  • Specify count
• df
  • Print available space (512 byte units)
  • flag for printing in kilobytes
  • Allow specifying filesystem device file
• dirname
  • Print directory name of string
• echo
  • Print to stdout
  • Resolve control characters
• expand
• [ ]
• expr
• false
• file
• find
• grep
• head
• kill
• ln
• ls
• man
• mkdir
• more
• mv
• nohup
• od
• ps
• pwd
• rm
• rmdir
• sleep
• sort
• tail
• test
• time
• touch
• true
• uname
• wc
• xargs

Documentation for the next commands should be added:

• basename
• cat
• chgrp
• chmod
• chown
• cmp
• cp
• cut
• date
• dd
• df
• diff
• dirname
• du
• echo
• expand
• expr
• false
• file
• find
• grep
• head
• kill
• ln
• ls
• man
• mkdir
• more
• mv
• nohup
• od
• ps
• pwd
• rm
• rmdir
• sleep
• sort
• tail
• test
• time
• touch
• true
• uname
• wc
• xargs

[IkerGalardi]

All the features and flags should be specified and the TODO list should be reevaluated to see the real progress.