for loop, counting forward for backward

for i in {1..15}; do echo $i; done
The brace expansion also allows you to count backward: for i in {15..1}; do echo $i; done You can also use this construct to create new file or new directory: mkdir dir{1..3} # Same as mkdir dir1 dir2 dir3

By: haivu
2009-03-21 23:08:41

What Others Think

for complex or more specialized counting, find jot ( that way you can do counting a lot easier say you want to ping a /24 range of ips, but every 5th IP for f in `jot - 0 255 5` ; do ping 192.168.0.$f ; done
chinkshady · 686 weeks and 5 days ago
seofox · 26 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: