i am having a file called as exec.pl . in that file i am having following lines. 
        use Cwd;
        ..
        ..
        #Now process Config file<br>
        open(CFG_READ, "< txt52_mm.org") || die "Couldn't open tmp con
+fig command file for reading";
        open(CFG, "> txt52_mm.cfg") || die "Couldn't open config file 
+for writing";
         ...
         ...
         ...
         
         ...
         ...
        open(ASM_READ, "< t52${fl}a.org") || die "Couldn't open tmp";
        open(ASM, "> t52${fl}a.asm") || die "Couldn't open file for wr
+iting ";


#######################################################

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i want to modify this file using perl script as follows
i want to add $execdir before txt52_mm.cfg or t52${f1}a.asm.
these name can be different but will have .org extension or .asm extension.

        use Cwd;
        $execdir = $ENV{EXECDIR};
        #Now process Config file
        open(CFG_READ, "< txt52_mm.org") || die "Couldn't open tmp con
+fig command file for reading";
open(CFG, "> $execdir/txt52_mm.cfg") || die "Couldn't open config file
+ for writing";


...
         ...
         ...
         
         ...
         ...

        

        open(ASM_READ, "< t52${fl}a.org") || die "Couldn't open tmp";
        open(ASM, "> $execdir/t52${fl}a.asm") || die "Couldn't open fi
+le for writing ";

[download]

Edit by BazB. Added code tags.

In reply to add a line or string in complex perl file by Anonymous Monk

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