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Show this month's calendar, with today's date highlighted
Explanation: * The date command evaluated to today's date with blank padded on the left if single digit * The grep command search and highlight today's date * The --before-context and --after-context flags displays up to 6 lines before and after the line containing today's date; thus completes the calendar. I have tested this command on Mac OS X Leopard and Xubuntu 8.10

Remove executable bit from all files in the current directory recursively, excluding other directories
With GNU chmod at least it is that simple.

Delete recursively only empty folders on present dir

Display the standard deviation of a column of numbers with awk

Substrings a variable
substrings a variable starting at position. If no offset given prints rest of the line

Show a file in less without wrapping long lines

seq can produce the same thing as Perl's ... operator.
Optionally, one can use {1..50} instead of seq. E.g. for i in {1..50} ; do echo Iteration $i ; done

Serve current directory tree at http://$HOSTNAME:8080/

View network activity of any application or user in realtime
The "-r 2" option puts lsof in repeat mode, with updates every 2 seconds. (Ctrl -c quits) The "-p" option is used to specify the application PID you want to monitor. The "-u' option can be used to keep an eye on a users network activity. "lsof -r 2 -u username -i -a"

Another Matrix Style Implementation


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