bind command can bind a key sequence to a Readline function or a macro.The key sequence of f5 is \e[15~,i bind f5 with pkill.
ffplay movie.mp4
bind -x '"\e[15~":"pkill ffplay"'
Now press f5, the movie stop playing.
The expression $(command) stands for command substitution; it means run command and put its output here.
echo "it is time to dig '\$(tput kf5)' on $(date)."
it is time to dig '$(tput kf5)' on Sat 07 May 2022 09:50:07 PM HKT.
Show result of $(tput kf5):
debian@debian:~$ echo "$(tput kf5)"
debian@debian:~$ echo '$(tput kf5)'
$(tput kf5)
No \e[15~ output here.Why bind -x '"$(tput kf5)":"pkill ffplay"' take as same effect as bind -x '"\e[15~":"pkill ffplay"'?
