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(29) Other UNIX commands

Other UNIX commands

An assortment of other useful UNIX commands --- remember that many commands can be "joined" together with the pipe "|" and that output from a command can be sent to a file with the redirect symbol.

Line oriented commands

grep: Searches a file for the string and reports on all matching lines.
find: Searches though a file system. E.g. find /usr/share -name \*zip\* will search the filesystem below "/usr/share" for filenames with "zip" in them.
sort: Sorts (alphabetic or numeric) lines in a file.
cut: Cuts fields out of a file.
who: Show who is logged to the system and what they are doing. The command w is almost identical to who
mail: A very basic mail user interface. Not recommended for reading mail, but very handy for sending mail. Typically used to mail yourself a notification that a long-running computation has finally finished.
at: Execute a command at a future time - useful for background jobs
script: Capture a terminal session to a file. Saves what you and the computer type to the screen (stdout). Saves the output to file "typescript".
sed: A stream editor, really nice in pipes.
awk: Pattern matching language. Very powerful.

Screen oriented commands

talk: Talk to another person on the internet.
irc: Internet relay chat. Talk with lots of people on the internet.
pine: A mail reader. There are other mail readers available too. You can even use a mail program at the end of a pipe. E.g. w | grep sam | mail $USER. This runs the "w" command and looks for user (string) sam; the output is then mailed to $USER (always set to your username).
textblitz: A purely text-based interface to the Blitzmail system
top: Show the most active processes on the system. An animated, sorted, ps listing.

slide30.src last modified Jan 31, 2011

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