I am trying to use an executable through my perl script which takes an input file and gives an output file with name output_.$inputfile. I want to check if this file output_.$inputfile already exists and if it already exist then add a numerical suffix as that can be incremented for each run. How can I do that. 

$abc_cmd = "abc.exe -i $input_file -o output_$input_file ";

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In reply to incrementing the file by abcdefg

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