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archlinux:Delete packages from pacman cache that are older than 7 days
Sometimes my /var/cache/pacman/pkg directory gets quite big in size. If that happens I run this command to remove old package files. Packages that we're upgraded in last N days are kept in case you are forced to downgrade a specific package. The command is obviously Arch Linux related.

Show UDID of iPhone
Display the serial of the iPhone (aka UDID).

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

find string into one pdf file

list files in 'hitlar' mode
Was playing with the shell. It struck to me, just by rearranging the parameters, i was able to remember what they did and in a cool way. Enter the 'hitlar' mode. bash-3.2$ ls -hitlar Shows all items with inodes, in list view, human readable size, sorted by modification time in reverse, bash-3.2$ ls -Fhitlar Shows the same with classification info. Add the hitlar mode alias to your .bashrc. bash-3.2$ echo "alias hitlar='ls -Fhitlar'" >> ~/.bashrc bash-3.2$ hitlar bash-3.2$ hitlar filename

add repeated watermark to image

List the most recent dates in reverse-chronological order

Update twitter with curl
Same as below, but no quotes are necessary when twitting more than one word

Kill any process with one command using program name
See also: killall

get rid of lines with non ascii characters
found here: https://stackoverflow.com/a/9035939


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