1 cat
  Concatenate input to output
1 cd
  Changes default directory.
1 date
  Displays current date and time.
1 echo
  Echos command line arguments.
1 find
  Find all files of given file name.
1 ls
  List files.
1 mkdir
  Make a new directory.
1 mv
  Move a file (rename).
1 od
  Generate octal dump of a file.
1 ps
  Display process information.
1 pwd
  Print Working Directory.
1 touch
  Touch a file.
1 tty
  Display terminal characteristics.
1 umask
  Unmask file protection (show file proction).
1 who
  Who is on the system.
1 wc
  Word count of input file.
