read -l -P "" number
if test -z "$number"
set number 2
end
# do something e.g. echo "Processed"
echo "Processed"
I want to read something from the standard input and then do something, e.g. echo "Processed". When Ctrl C is inputted from the standard input, I wish do something will never be executed. However, do something is always be executed.
I tried to use trap to kill %self, like
trap 'kill %self' INT
read -l -P "" number
if test -z "$number"
set number 2
end
# do something e.g. echo "Processed"
echo "Processed"
However, %self should not be killed. This program is triggered by a shortcut. The pid of the program of the same as the pid of the terminal. Thus when kill %self is executed, the terminal is been closed. This is not expected.
The pid of the program of the same as the pid of the terminal.
When read reads from the terminal and gets a ctrl-c, it is already aborted [0].
However, in that case it sets the variable to empty and returns a false status.
You never check that status, and so execution just continues with an empty variable.
What you want is simply this:
read -l -P "" number
or exit # or return or handling it in another way.
You can also use an if:
if read -l -P "" number
# do things you would do if read wasn't aborted
# Note: $number can still be empty if the user just pressed enter!
end
[0]: When you read from e.g. a pipe, the ctrl-c would typically end the writing process, and so read would get an end-of-file instead of a newline, and the same thing would happen.