问题
I want to fire a command like " rm -rf /etc/XXX.pid
" when the shell script is interrupted in the middle of its execution. Like using CTRL+C
Can anyone help me what to do here?
回答1:
Although it may come as a shock to many, you can use the bash
built-in trap
to trap signals :-)
Well, at least those that can be trapped, but CTRL-C is usually tied to the INT
signal. You can trap the signals and execute arbitrary code.
The following script will ask you to enter some text then echo it back to you. If perchance, you generate an INT
signal, it simply growls at you and exits:
#!/bin/bash
exitfn () {
trap SIGINT # Restore signal handling for SIGINT
echo; echo 'Aarghh!!' # Growl at user,
exit # then exit script.
}
trap "exitfn" INT # Set up SIGINT trap to call function.
read -p "What? " # Ask user for input.
echo "You said: $REPLY"
trap SIGINT # Restore signal handling to previous before exit.
A test run transcript follows (a fully entered line, a line with pressing CTRL-C before any entry, and a line with partial entry before pressing CTRL-C):
pax> ./testprog.sh
What? hello there
You said: hello there
pax> ./testprog.sh
What? ^C
Aarghh!!
pax> ./qq.sh
What? incomplete line being entere... ^C
Aarghh!!
回答2:
trap
is used to catch signals in scripts, including the SIGINT
generated when Ctrl-C is pressed.
来源:https://stackoverflow.com/questions/14702148/how-to-fire-a-command-when-a-shell-script-is-interrupted