---
name: "Perl::Critic::Policy::ValuesAndExpressions::ProhibitLeadingZeros"
section: "3pm"
platform: "linux"
package: "perl-perl-critic"
version: "1.156-3"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/Perl::Critic::Policy::ValuesAndExpressions::ProhibitLeadingZeros"
---

# Perl::Critic::Policy::ValuesAndExpressions::ProhibitLeadingZeros(3pm)

Write "oct(755)" instead of "0755".

## NAME

Perl::Critic::Policy::ValuesAndExpressions::ProhibitLeadingZeros - Write "oct(755)" instead of "0755".

## AFFILIATION

This Policy is part of the core Perl::Critic distribution.

## DESCRIPTION

Perl interprets numbers with leading zeros as octal.  If that's what you really want, its better to use `"oct"` and make it obvious.

```
    $var = 041;     # not ok, actually 33
    $var = oct(41); # ok
    chmod 0644, $file;                              # ok by default
    dbmopen %database, 'foo.db', 0600;              # ok by default
    mkdir $directory, 0755;                         # ok by default
    sysopen $filehandle, $filename, O_RDWR, 0666;   # ok by default
    umask 0002;                                     # ok by default
    use POSIX 'mkfifo';
    mkfifo $fifo, 0600;                             # ok by default
    POSIX::mkfifo $fifo, 0600;                      # ok by default
```

## CONFIGURATION

If you want to ban all leading zeros, set `"strict"` to a true value in a *.perlcriticrc* file.

```
    [ValuesAndExpressions::ProhibitLeadingZeros]
    strict = 1
```

## AUTHOR

Jeffrey Ryan Thalhammer \<jeff@imaginative-software.com\>

## COPYRIGHT

Copyright (c) 2005-2023 Imaginative Software Systems.  All rights reserved.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.  The full text of this license can be found in the LICENSE file included with this module.