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Full Discussion: need help in IF condition!!
Top Forums Shell Programming and Scripting need help in IF condition!! Post 302179728 by era on Friday 28th of March 2008 11:20:02 AM
Old 03-28-2008
if tests the exit status of [. In the "if" branch, by definition, $? will be 0. It is the exit code of the command [ -s temp.txt ]. Yes, it is confusing to newbies that "open square bracket" is the name of a command, but that's what it is. You can call it test if you think that's less confusing.

Code:
test -s file66.txt || { echo "It's zero"; exit 99; }

 

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LEARN ABOUT CENTOS

gtester

GTESTER(1)							   User Commands							GTESTER(1)

NAME

       gtester - test running utility

SYNOPSIS

       gtester [OPTION...] [testprogram]

DESCRIPTION

       gtester is a utility to run unit tests that have been written using the GLib test framework.

       When called with the -o option, gtester writes an XML report of the test results, which can be converted into HTML using the gtester-report
       utility.

OPTIONS

       -h, --help
	   print help and exit

       -v, --version
	   print version information and exit

       --g-fatal-warnings
	   make warnings fatal

       -k, --keep-going
	   continue running after tests failed

       -l
	   list paths of available test cases

       -m=MODE
	   run test cases in MODE, which can be one of:

	   perf
	       run performance tests

	   slow, thorough
	       run slow tests, or repeat non-deterministic tests more often

	   quick
	       do not run slow or performance tests, or do extra repeats of non-deterministic tests (default)

	   undefined
	       run test cases that deliberately provoke checks or assertion failures, if implemented (default)

	   no-undefined
	       do not run test cases that deliberately provoke checks or assertion failures

       -p=TESTPATH
	   only run test cases matching TESTPATH

       -s=TESTPATH
	   skip test cases matching TESTPATH

       --seed=SEEDSTRING
	   run all test cases with random number seed SEEDSTRING

       -o=LOGFILE
	   write the test log to LOGFILE

       -q, --quiet
	   suppress per test binary output

       --verbose
	   report success per testcase

SEE ALSO

       gtester-report(1)

GLib																	GTESTER(1)
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