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Count lines in a file with grep
Returns the number of lines in a file, emulates "wc -l" behavior with grep.

Get your external IP address without curl
Curl is not installed by default on many common distros anymore. wget always is :) $ wget -qO- ifconfig.me/ip

Perl Command Line Interpreter
Read, Evaluate, Print, Loop - REPL

Find out the last times your system was rebooted (for the duration of wtmp).

grep binary (hexadecimal) patterns
-P activates the Perl regular expression mode.

Tar files matching a certain wildcard
This is a shortcut to tar up all files matching a wildcard. Tar doesn't have the --include (apparently).

Remove color codes (special characters) with sed
Works great on Mac OSX.

Scan a document to PDF
Adjust the --resolution and --mode as required (if these options are available for your scanner). The size options (-x, -y, -imageheight, -imagewidth) are for US letter paper. For A4, I think the command would be: $scanimage -p --resolution 250 --mode Gray -x 210 -y 297 | pnmtops -imageheight 11.7 -imagewidth 8.3 | ps2pdf - output.pdf

check open ports without netstat or lsof

convert markdown to PDF
This is the one-line version of this htmldoc + markdown combo to convert markdown formatted text to PDF files to distribute to your non-savvy project managers. http://scottnesbitt.net/ubuntublog/?p=114

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