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Message: [QUOTE="Public Interest, post: 4746393"] I followed your instruction as sh -x RUN.sh but except it prints something extra as + perl 111.pl + perl 222.pl , it is the same as sh RUN.sh I can run perl anywhere, so I think perl is in my path in my abc.pl file, I "open (INPUT "input.txt")", so if the input file sits right with the .pl file, and it works perfectly if I call from the same dir. but not from other dirs my file system: /perlfiles/111.pl /perlfiles/222.pl /perlfiles/333.pl /perlfiles/abc.pl /perlfiles/input.txt /perlfiles/RUN1.sh /RUN2.sh at /perlfiles/ "sh RUN1.sh" OK "RUN1.sh" bash: RUN1.sh: command not found at / "sh /perlfiles/RUN1.sh" file input.txt not found in abc.pl "sh RUN2.sh" file input.txt not found in abc.pl What I think I can do is I CD to the path in RUN2.sh and run the script, and CD back to the default dir. But it seems other better ways to do it. [/QUOTE]