Bash: how to put command output/file contents on the command line

In certain situations, you may want to have a command that you e.g. saved in a file on your command line before executing it. As I didn’t find an answer straight away, here’s a quick-and-dirty way to do it that executes a command when you press a keyboard shortcut:

bind -x '"\C-g":"READLINE_LINE=$(cat dnsmasq_command)"'

This will put the contents of the file named ‘dnsmasq_command’ on your command line when you press Control-G.

And while we’re at it, while it’s got nothing to do with this article, here’s a binding that puts a time stamp (like 20200408022000, no, not a palindrome) on your command line:

bind -x '"\C-g":"READLINE_LINE=${READLINE_LINE:0:$READLINE_POINT}$(date +%Y%m%d%H%M00)${READLINE_LINE:$READLINE_POINT}; READLINE_POINT=$((($READLINE_POINT+14)))"'

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