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Can't exec "sh": No such file or directory at
    ../home/lib/dirA/perl_script.pm line 91 (#1)
...
architecture, or the #! line in a script points to an interpreter that
can't be run for similar reasons.  (Or maybe your system doesn't suppo
+rt
#! at all.)

chdir "/home/lib/dirA/";
system("sh shell_script.sh");