12-05-2006
Variable check for existence ?
Hi ,
I have a script wherein i have a For Loop.
Within this for loop i create a variable and assign it a value.
The script goes to a For Loop only if certain conditions are met , which means the variable may or may not exists.
However down the line in the script i have to check if that variable exists on or not.
How do i check this
I tried this but the script fails with the following error "Specify a parameter with this command."
if [ -s ${FILE_LIST} ]
then
echo "Variable Exist"
fi
Please help
Sam
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LEARN ABOUT DEBIAN
io::async::looptests
IO::Async::LoopTests(3pm) User Contributed Perl Documentation IO::Async::LoopTests(3pm)
NAME
"IO::Async::LoopTests" - acceptance testing for "IO::Async::Loop" subclasses
SYNOPSIS
use IO::Async::LoopTests;
run_tests( 'IO::Async::Loop::Shiney', 'io' );
DESCRIPTION
This module contains a collection of test functions for running acceptance tests on IO::Async::Loop subclasses. It is provided as a
facility for authors of such subclasses to ensure that the code conforms to the Loop API required by "IO::Async".
TIMING
Certain tests require the use of timers or timed delays. Normally these are counted in units of seconds. By setting the environment
variable "TEST_QUICK_TIMERS" to some true value, these timers run 10 times quicker, being measured in units of 0.1 seconds instead. This
value may be useful when running the tests interactively, to avoid them taking too long. The slower timers are preferred on automated
smoke-testing machines, to help guard against false negatives reported simply because of scheduling delays or high system load while
testing.
TEST_QUICK_TIMERS=1 ./Build test
FUNCTIONS
run_tests( $class, @tests )
Runs a test or collection of tests against the loop subclass given. The class being tested is loaded by this function; the containing
script does not need to "require" or "use" it first.
This function runs "Test::More::plan" to output its expected test count; the containing script should not do this.
TEST SUITES
The following test suite names exist, to be passed as a name in the @tests argument to "run_tests":
io
Tests the Loop's ability to watch filehandles for IO readiness
timer
Tests the Loop's ability to handle timer events
signal
Tests the Loop's ability to watch POSIX signals
idle
Tests the Loop's support for idle handlers
child
Tests the Loop's support for watching child processes by PID
control
Tests that the "run", "stop", "loop_once" and "loop_forever" methods behave correctly
AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
perl v5.14.2 2012-10-24 IO::Async::LoopTests(3pm)