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system 'echo "r\ny\nr" | phylip sub_program_1';
Hurray... it runs perfectly well :-) Your observation, to include "\n" after each alphabet is correct way to run "phylip" you wrote in Re^3..
By giving "\n" and "- e", "phylip" was overfed. So, It didn't work that time. After you have explained function of "-e" and "-n" in Re^5, I removed "-e" and it worked perfectly well.I appreciate your help, Cheers ChakIn reply to Re^6: How to execute external programs from perl script
by chak9988
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