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Perl in a Nutshell

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Function Reference
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chmod mode, filelist

Changes the permissions of a list of files. The first argument must be the permissions mode given in its octal number representation. The function returns the number of files successfully changed. For example:

$cnt = chmod 0755, 'file1', 'file2';
will set $cnt to 0, 1, or 2, depending on how many files got changed (in the sense that the operation succeeded, not in the sense that the bits were different afterward).

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Reference: chdirBook IndexReference: chomp