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Thanks MidLifeXis, As per your inputs i have tried to implement this,Below is the code i tried it,i am able to succeed to rename all tons of files in my directory.
#!/usr/bin/perl $dir = "C:\\Users\\user\\Desktop\\test"; opendir DIR, $dir or die "error: cannot open directory \"$dir\" $!"; @files = sort grep (!/^\.$|^\.\.$/, readdir(DIR)); closedir (DIR); foreach $fl(@files) { if($fl =~ m/\.doc/) { @a = split(/\.doc/,$fl); foreach $len(@a) { $z = length $len; if($len <= $z) { @x = substr($len,0,7); foreach $mod(@x) { $mod = "A".$mod.".doc"; rename $fl,$mod; } } } } }



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