|
| From: | Christof Warlich |
| Subject: | Re: [Help-bash] Solved: Re: Distinguish between unset and empty variables in loop. |
| Date: | Thu, 15 Dec 2016 20:47:11 +0100 |
| User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 |
Am 15.12.2016 um 03:36 schrieb Dmitry Alexandrov:
,----[ ./warlich ]
| #!/bin/bash
|
| xxx=hi
| yyy=""
| unset zzz
|
| for v in xxx yyy zzz; do
| [[ -v $v ]] || printf -v "$v" 'default'
| printf '%s=%s\n' "$v" "${!v}"
| done
`----
,----
| $ ./warlich
| xxx=hi
| yyy=
| zzz=default
`----
That's definitly much better than my hack, thanks :-).I would just not have expected that the "unset-ness" of a variable is still available directly through the loops index variable ...
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