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If you then single quote your s/// expression to protect from shell interpolation

Adding single quotes does not protect from shell interpolation.

That will fail if $hash1 or $hash2 can contain «'», I don't think that's possible, but I don't know for sure.

That's why I use

$s =~ s/'/'\\''/g; return "'$s'";

instead of

return "'$s'";

Update: philipbailey has since pointed out that the hash cannot contains quotes. While you can't context text to a shell literal using the second snippet in general, it appears to be safe in this particular circumstance.


In reply to Re^2: Find and replace MD5 hash from file by ikegami
in thread Find and replace MD5 hash from file by adroc

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