Enter a line of Bash starting with a
#comment, then run
!:qon the next line to see what that would be with proper Bash escaping applied.
bash-3.2$ # This string 'has single' "and double" quotes and a $ bash-3.2$ !:q '# This string '\''has single'\'' "and double" quotes and a $' bash: # This string 'has single' "and double" quotes and a $: command not found
!character begins a history expansion;
!stringproduces the last command beginning with
:qis a modifier that quotes the result; so I’m guessing this is equivalent to
"", so it produces the most recent command, just like