Save last "copy" from clipboard to file
Solution 1:
xclip
is the command line interface to X selections (clipboard)
xclip -o > helloworld.c
You may need to modify the command depending on the selection you're using
-selection
specify which X selection to use, options are "primary" to use XA_PRIMARY (default), "secondary" for XA_SECONDARY or
"clipboard" for XA_CLIPBOARD