Other shell niftiness

• Learn about job control. Very handy to have around the shell and with care, can be used in scripts too.

• Using perl one-liners for regular expression stuff that is easier in perl. Good for quick things, but maybe consider writing the script in perl to start with

  • perl -ple 's/\s/:/g' < file2.txt
  • man perlre; man perlrun

• Learn special variables

  • $? - exit status of last command
  • $$ - process ID of current shell
  • $* or $@ - all positional paremeters
  • $1, $2, $3, etc - positional paremeters
  • $# - number of positional parameters

• RANDOM special variable (see man bash)

Notes: