Brace expansion with numbers in bash

Question

This code

echo {1..7}

prints 1 2 3 4 5 6 7.

But this code

t=7
echo {1..$t}

prints {1..7}.

How do I get {1..$t} to expand to 1 2 3 4 5 6 7?

See [the bash manual](http://www.gnu.org/software/bash/manual/bashref.html#Shell-Expansions) for the order of expansions. — glenn jackman, Sep 22 '13 at 16:24

Fredrik Pihl · Accepted Answer · 2013-09-22T12:55:38.600

6

You don't. Use e.g. seq for that, because brace expansion is performed before any other expansions and eval is evil :-)

$ a=5

$ seq 1 $a
1
2
3
4
5

edited Sep 22 '13 at 12:55

answered Sep 22 '13 at 12:45

Fredrik Pihl

See e.g. http://mywiki.wooledge.org/BashFAQ/048 – Fredrik Pihl Sep 22 '13 at 15:15

score 1 · Answer 2 · answered Sep 22 '13 at 12:45

1

Use eval(evaluate) in shell script.

eval echo {1..$t}

answered Sep 22 '13 at 12:45

user1502952

2 Answers2