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allgclub css

Retry the previous command until it exits successfully

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"

Get your external IP address ( 10 characters long )
Shortest url to a external IP-service, 10 characters.

Copy all documents PDF in disk for your home directory
I used this to copy all PDFs recursively to a selected dir

list block devices
Shows all block devices in a tree with descruptions of what they are.

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" }

Find last reboot time
Specific to OSX.

Install Linux Kernel Headers on Debian-based systems
Install the Linux kernel headers for currently running kernel version on Debian-based systems via apt-get

Displays process tree of all running processes
G - uses VT100 line drawing a - shows command line arguments of process p - prints PID of process For other options, man pstree :)


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