Question

I’m currently going trough bash tutorial :

http://linuxconfig.org/Bash_scripting_Tutorial

And I came to the part which I’m having troubles to understand :

#!/bin/bash
# bash trap command
trap bashtrap INT
# bash clear screen command
clear;
# bash trap function is executed when CTRL-C is pressed:
# bash prints message => Executing bash trap subrutine !
bashtrap()
{
    echo "CTRL+C Detected !...executing bash trap !"
}
# for loop from 1/10 to 10/10
for a in `seq 1 10`; do
    echo "$a/10 to Exit." 
    sleep 1;
done
echo "Exit Bash Trap Example!!!"

Where exactly do you specify ok trap CTRL+C? This line trap bashtrap INT ? does INT mean something?

Answer 1

INT is SIGINT or “Interrupt from keyboard”, the signal that Ctrl+C causes.

If you’re on Linux, see the manpage signal(7) for more information about SIGINT and other signals.