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list files recursively by size

Create a temporary file
To create directory, use: $ tempdir=$(/bin/mktemp -d)

replace XX by YY in the the current directory and cd to it. ( in ZSH )
If you are in /begin/path/with/XX/pattern cd XX YY will change your current directory to /begin/path/with/YY/pattern in ZSH

Advanced python tracing
Trace python statement execution and syscalls invoked during that simultaneously

Find jpeg images and copy them to a central location
Use if you have pictures all over the place and you want to copy them to a central location Synopsis: Find jpg files translate all file names to lowercase backup existing, don't overwrite, preserve mode ownership and timestamps copy to a central location

Change active bond slave
This forces a bonded interface to switch to another slave in the bond as its active slave.

Replace duplicate files by hardlinks

Terminal Keyboard Shortcut list
This command will give you a list of available keyboard shortcuts according to stty.

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"

Convert seconds to [DD:][HH:]MM:SS
Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }


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