On Thu, Jan 01, 2015 at 11:13:34PM +0100, Andreas Henriksson wrote:
> ,---- [ man blkid ]
> | RETURN CODE
> | If the specified token was found, or if any tags were shown from (specified) devices, 0 is returned.
> | If the specified token was not found, or no (specified) devices could be identified, an exit code of 2 is returned.
> | For usage or other errors, an exit code of 4 is returned.
> | If the ambivalent low-level probing result was detected, an exit code of 8 is returned.
> `----
>
> The code doesn't seem to work like described in the (first part of the)
> second sentence. The exit code is only 2 if *no* tokens was identified,
> 0 if tokens was found but none matched the filter.
IMHO it works as expected
$ blkid -t TYPE=ext4 &> /dev/null; echo $?
0
$ blkid -t TYPE=foo &> /dev/null; echo $?
2
the return code is no affected by output tags, it means by -s <tag>
$ blkid -t TYPE=ext4 -s DUMMY; echo $?
0
$ blkid -t TYPE=ext4 -s LABEL; echo $?
/dev/sda2: LABEL="boot"
0
maybe we need to improve the man page to make the description more
precise, but code works as expected. It differentiates between device
identification and output stuff.
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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