Ask user to confirm

Confirm() { read -sn 1 -p "$1 [Y/N]? "; [[ $REPLY = [Yy] ]]; }
Returns true if user presses the key. Use it like Confirm "Continue" && do action

By: frans
2010-11-22 11:01:14

1 Alternatives + Submit Alt

What Others Think

It's usually good UI to display the response so the user can confirm that he really did press the wrong key so I would recommend leaving of the -s. If you'd like to have an echo after the prompt so the next output is not on the same line as the prompt, you can do one of these: confirm() { read -n 1 -p "$1 [Y/N]? "; [[ $REPLY = [Yy] ]] && echo || { echo; return 1;} } confirm() { read -n 1 -p "$1 [Y/N]? "; [[ $REPLY = [Yy] ]]; local r=$?; echo; return $r; }
dennisw · 582 weeks and 2 days ago
The fact is that in scripts where i used that, i used the verbosity of the involved action like: Confirm "Delete files" && rm -v $Files || echo "cancelled"
frans · 582 weeks and 2 days ago
how do i halt the script if user pressed N at Confirm() { read -sn 1 -p "$1 [Y/N]? "; [[ $REPLY = [Yy] ]]; } Confirm "Continue?"
rubo77 · 529 weeks and 1 day ago
if you mean 'exit', then it's simply: Confirm "Continue" || exit The "?" is already in the function so there's no need to pass it in the parameter.
frans · 529 weeks and 1 day ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

You must be signed in to comment.

What's this? is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.


Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for: