Alternately use the LIST form of system yourself directly (or IPC::Run if you need the output from the subprocess) and take any intermediary shell out of the picture to begin with and you won't need to worry about quoting. 

my $test_sh_ret = system( "test.sh", $string );

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In reply to Re^2: passing a command line argument by Fletch
in thread passing a command line argument by s_gaurav1091

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