How to convert timestamps to dates in Bash?
On later versions of common Linux distributions you can use:
date -d @1267619929
This version is similar to chiborg's answer, but it eliminates the need for the external tty and cat. It uses date, but could just as easily use gawk. You can change the shebang and replace the double square brackets with single ones and this will also run in sh.
#!/bin/bashLANG=Cif [[ -z "$1" ]]then if [[ -p /dev/stdin ]] # input from a pipe then read -r p else echo "No timestamp given." >&2 exit fielse p=$1fidate -d "@$p" +%c