Sequences expansion and variable in bash -

i having problem builtin sequences (ie: not using seq) in bash when seq number variable. example, works , print me 1 2 3:

for in {1..3};do echo $i;done

but :

bash-3.2$ a=3;for in {1..$a};do echo $i;done

fail , print me {1..3} only

this works zsh , know have alternative make counter thing wondering if bug or brace expansion feature!

in bash, brace expansion performed before variable expansion. see shell expansions order.

$ a=7; echo {1..3} {4..$a} 1 2 3 {4..7}

if want use variable, use c-style for loops in shawn's answer.

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