--- On Thu, 12/25/08, Erez D <erez0...@gmail.com> wrote:
> From: Erez D <erez0...@gmail.com>
> Subject: bash q -substitution
> To: "linux-il" <linux-il@cs.huji.ac.il>
> Date: Thursday, December 25, 2008, 11:20 AM
> hi
>
> i need to convert a string using bash
>
>
> input_000.txt -> i need to extract the 000
For this exact pattern you can do
echo ${i:6:3}
6 - offset
3 - length
Why do you want it in one command ?
Valery
>
> using sed i would do : sed
> 's/^.*_//ls/\.txt$//'
>
> using bash i can do in two lines:
> (assuming input-string is stored in variable 'i' )
>
> x=${i##*_}
> result=${x%%.txt}
>
>
> can it be done in bash in one line ? (i.e. can i
> concatenate substitutions
> ?)
>
>
> thanks,
> erez.
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