Overcome Bash's expansion order

eval "mkdir test{$(seq -s, 1 10)}"
In order to create, let's say, 10 directories with a single process we can use the command: mkdir test{1,2,3,4,5,6,7,8,9,10} something extremely boring to type! Why not use seq? seq -s, 1 10 and use its output inside the curly braces? The obvious solution mkdir test{$(seq -s, 1 10)} is, unfortunately, too naive and doesn't work. The answer is the order of the shell expansions (feature of Bourne Shell, actually), where brace expansion happens before command substitution (according to Bash's manual). The solution is to put another level of substitution, using the powerful and mystic command eval. I found the trick in a similar problem in the post at http://stackoverflow.com/questions/6549037/bash-brace-expansion-in-scripts-not-working-due-to-unwanted-escaping

0
By: xakon
2011-07-23 17:09:01

1 Alternatives + Submit Alt

What Others Think

lol, what bash versions you use? mkdir test{1..10} works fine
zolden · 660 weeks and 2 days ago
I'm sorry that didn't clarify enough my point, but I DON'T want to type these numbers in the command line. For example, I could use shell parameters or get another output from a program, which produces for example words and not numbers. But, yes, of course, what you've written works perfectly fine on most recent versions of Bash! It's the hard-wired numbers that are unwanted here...
xakon · 660 weeks and 2 days ago
Sorry, I didn't get it. You used "1" and "10", I used the same 2 numbers, not whole sequence. What's the difference?
zolden · 660 weeks and 2 days ago
Ok, say you need something like this: seq -s, 1 4 1000 How, are you going to write it? Or, let's say you're creating the directories "lonely", "closely", "finally" and all these names are stored in a shell variable, or can be extracted from another program. The numbers here are just an example. A simple, and maybe not very suitable, example. They don't really have any special meaning.
xakon · 660 weeks and 2 days ago
>you need something like this: >seq -s, 1 4 1000 The answer is echo {1..100..4},
zolden · 660 weeks and 1 day ago
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pugpuppies95 · 34 weeks and 2 days 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?

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commandlinefu.com 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.

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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.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

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,…):

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