A fix is available
APAR status
Closed as program error.
Error description
In some instances, the -z and -n flags may return the opposite result of what is expected. One instance where this is observed is after receiving an error when using variable substitution during a redirection attempt. For example: #!/bin/ksh TEST="test" > /tmp/$$/output if [ -z "${TEST}" ] then echo "Error - TEST is not empty, it is: $TEST" fi If the /tmp/<PID> directory does not exist, that redirection attempt will display an error message, and the evaluation of the -z flag immediately after the redirection attempt will be incorrect.
Local fix
Workaround: Changing the format of the 'if' statement can avoid the issue. For example, change: if [ -z "${TEST}" ] to: if [[ -z "${TEST}" ]]
Problem summary
Under some circumstances, the -z and -n tests may not return correct values.
Problem conclusion
Made code changes to take care of all error conditions.
Temporary fix
Comments
APAR Information
APAR number
IZ74672
Reported component name
AIX 5.3
Reported component ID
5765G0300
Reported release
530
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2010-04-15
Closed date
2010-04-30
Last modified date
2013-03-28
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
AIX 5.3
Fixed component ID
5765G0300
Applicable component levels
R530 PSY U837633
UP10/09/20 I 1000
PTF to Fileset Mapping
U837633 bos.rte.shell 5.3.11.4
[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG11P","label":"APARs - AIX 5.3 environment"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"530","Edition":"","Line of Business":{"code":"","label":""}}]
Document Information
Modified date:
28 March 2013