[
https://issues.apache.org/jira/browse/CASSANDRA-2520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13022339#comment-13022339
]
Jackson Chung commented on CASSANDRA-2520:
------------------------------------------
be ware some of them are *!=* while some are *=*
there is -z and -n to use, be ware the importance of ""
no "" on $TEST
{noformat}
$ cat test3.sh
TEST=$1
echo "TEST is:$TEST"
if [ -z $TEST ]; then
echo "TEST is zero-string"
else
echo "TEST is not zero-string"
fi
if [ -n $TEST ]; then
echo "TEST is non-zero string"
else
echo "TEST is not a non-zero string"
fi
$ bash test3.sh
TEST is:
TEST is zero-string
*TEST is non-zero string*
$ dash test3.sh
TEST is:
TEST is zero-string
*TEST is non-zero string*
$
the "non-zero string" is incorrect
{noformat}
"" on $TEST
{noformat}
$ cat test2.sh
TEST=$1
echo "TEST is:$TEST"
if [ -z "$TEST" ]; then
echo "TEST is zero-string"
else
echo "TEST is not zero-string"
fi
if [ -n "$TEST" ]; then
echo "TEST is non-zero string"
else
echo "TEST is not a non-zero string"
fi
$ bash test2.sh
TEST is:
TEST is zero-string
TEST is not a non-zero string
$ dash test2.sh
TEST is:
TEST is zero-string
TEST is not a non-zero string
{noformat}
> use -z to test for empty variables to make sh and dash happy
> ------------------------------------------------------------
>
> Key: CASSANDRA-2520
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2520
> Project: Cassandra
> Issue Type: Bug
> Components: Packaging
> Reporter: Jonathan Ellis
> Assignee: Jonathan Ellis
> Priority: Minor
> Fix For: 0.7.5
>
> Attachments: 2520-0.7.txt
>
>
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