Commands by Tekhne (9)

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set your screensaver as your desktop background MAC OSX

Grep syslog today last hour
Uses date to grep de logfile for today and uses it to get the last hour logs. Can be used to get last minute logs or today's logs.

Check if *hardware* is 32bit or 64bit
This command tell you if your hardware is 32 or 64 bits even if you install a 32bits OS on a 64 bits hardware. If your distro don't support the -q switch, try doing : $ grep &>/dev/null '\' /proc/cpuinfo && echo 64 bits || echo 32 bits

Function to create an alias on the fly
Is used like this: mkalias rmcache "rm -rfv app/cache/*"

Get the size of all the directories in current directory
OSX's BSD version of the du command uses the -d argument instead of --max-depth.

youtube2m3u
generate playlists from youtube ( or othre things that support yt-dlp)

view the system memory in clear text
see what's in your memory right now... sometimes you find passwords, account numbers and url's that were recently used. Anyone have a safe command to clear the memory without rebooting?

Check if port is open on remote machine
Check if port is open, if you don't have ncat on your machine.

Get the Nth argument of the last command (handling spaces correctly)
Bash's history expansion character, "!", has many features, including "!:" for choosing a specific argument (or range of arguments) from the history. The gist is any number after !: is the number of the argument you want, with !:1 being the first argument and !:0 being the command. See the sample output for a few examples. For full details search for "^HISTORY EXPANSION" in the bash(1) man page.    Note that this version improves on the previous function in that it handles arguments that include whitespace correctly.

Extracting a range of pages from a PDF, using GhostScript
In this example we extract pages 14-17

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