Overcome Bash's expansion order

• Overcome Bash's expansion order

  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

  This is sample output - yours may be different.

  
  

  0
  eval "mkdir test{$(seq -s, 1 10)}"
  xakon · 2011-07-23 17:09:01 11
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=$ mkdir ${1..10} bash: ${1..10}: bad substitution

depesz · 703 weeks and 3 days ago

The correct version of this would be mkdir {1..10}

baerbl · 703 weeks and 1 day ago

yeah, my shocker, shouldn't have the $ in there.

linuts · 703 weeks and 1 day ago

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