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Re: remove empty '' in ${var@Q} result?
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From: |
Chet Ramey |
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Subject: |
Re: remove empty '' in ${var@Q} result? |
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Date: |
Mon, 30 Oct 2017 10:41:02 -0400 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 |
On 10/29/17 10:34 PM, Clark Wang wrote:
> See following example:
>
> [STEP 100] # echo $BASH_VERSION
> 4.4.12(2)-release
> [STEP 101] # v=\'\'
> [STEP 102] # printf '%q\n' "$v"
> \'\'
> [STEP 103] # printf '%s\n' "${v@Q}"
> ''\'''\'''
> [STEP 104] #
This is an effect of using single quotes in the @Q operator. If you want
to single-quote a string containing single quotes, this is how you do it.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU chet@case.edu http://cnswww.cns.cwru.edu/~chet/