Chmod Calculator

Calculate file permissions in Linux using a visual interface

File Permissions Calculator

Owner

Group

Others

Numeric Notation

000

Symbolic Notation

---------

Command

chmod 000 filename

Quick Reference

Common Permission Patterns

  • chmod 755
    Standard permission for executable scripts
  • chmod 644
    Standard permission for regular files
  • chmod 777
    Full access to everyone (use cautiously!)
  • chmod 700
    Private file - owner only access

Chmod Command Options

  • -R
    Recursively change permissions
  • u+x
    Add execute permission for user
  • go-w
    Remove write permission for group and others
  • a+r
    Add read permission for all

What is chmod?

chmod (change mode) is a command-line utility in Unix and Linux systems used to change the access permissions of files and directories. Permissions control who can read, write, or execute a file.

Understanding File Permissions

  • Owner: The user who owns the file.
  • Group: Other users in the file's group.
  • Others: All other users.
PermissionSymbolValue
Readr4
Writew2
Executex1

Examples

  • chmod 755 file.sh — Owner can read/write/execute, group and others can read/execute.
  • chmod 644 file.txt — Owner can read/write, group and others can read only.
  • chmod 700 script.sh — Only owner can read/write/execute.

Tips & Best Practices

  • Never give write permissions to others unless necessary.
  • Use chmod -R to change permissions recursively for directories.
  • Be cautious with 777 — it gives full access to everyone.

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