GNU bug report logs - #26491
date and echo using with underscore

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Package: coreutils;

Reported by: Edmond Yuen <lordedmond <at> gmail.com>

Date: Fri, 14 Apr 2017 06:41:02 UTC

Severity: normal

Tags: notabug

Done: Assaf Gordon <assafgordon <at> gmail.com>

Bug is archived. No further changes may be made.

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From: Reuti <reuti <at> staff.uni-marburg.de>
To: Edmond Yuen <lordedmond <at> gmail.com>
Cc: 26491 <at> debbugs.gnu.org
Subject: bug#26491: date and echo using with underscore
Date: Fri, 14 Apr 2017 17:14:07 +0200

Hi,

> Am 14.04.2017 um 08:36 schrieb Edmond Yuen <lordedmond <at> gmail.com>:
> 
> Please verify the script below:
> 
> #/bin/bash
> 
> D=`date +%Y%m%d`
> i="someparameter"
> 
> echo $D_$i
> echo $D\_$i
> echo $D
> echo $i
> echo _
> 
> 
> 
> 
> //   my system is debian with coreutils 8.26-3
> //
> //   db=`date -d "-1day" +%Y%m%d`
> //   i="0"
> This is the result from my system
> 
> ~$ echo "$db_$i"
> 0
> ~$ echo "$db\_$i"
> 20170413\_0
> ~$ echo "$db$i"
> 201704130

The syntax is to use curly braces to limit the name of the varable:

echo "${db}_${i}"

-- Reuti
This bug report was last modified 8 years and 123 days ago.

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