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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" }

Change pidgin status
Thanks for the comment oshazard, i wasn't aware of purple-remote existence.

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 CSV to JSON
Replace 'csv_file.csv' with your filename.

Show which programs are listening on TCP ports
Alternative: $ ss -tlpn

Reload all sysctl variables without reboot
Reload all defined kernel variables from /etc/sysctl.conf(if no parameter after -p is given) without the old myth "Ah, you'll need to reboot to apply those variables"...

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

Function to split a string into an array
It works as a method applicated to a variable, converts the string variable into an array

Print a horizontal line

check open ports without netstat or lsof


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