Retrieve the original working directory of the current Unix shell session:
$ echo $( cd '$(dirname $0)' >/dev/null 2>&1 ; pwd -P )
Copy a file to clipboard:
$ xclip -sel c < /path/to/MyFileName
Clear system cache & swap:
$ sync; echo 3 > /proc/sys/vm/drop_caches
$ swapoff -a
$ swapon
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