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.

Related Tools

ACL Permission Generator (getfacl/setfacl)

ACL Permission Generator (getfacl/setfacl)

<p>A Linux tool to generate getfacl and setfacl commands for managing Access Control Lists (ACLs) on files and directories.</p>

Try this tool →
Chmod Calculator

Chmod Calculator

Calculate file permissions in Linux using a visual interface

Try this tool →
Chown Command Generator

Chown Command Generator

<p>A Linux tool to easily generate chown commands for changing file ownership between users and groups</p>

Try this tool →
Crontab Generator

Crontab Generator

Generate cron expressions for scheduled tasks

Try this tool →
Docker Volume Permission Helper

Docker Volume Permission Helper

<p>A tool to help resolve permission issues between Docker containers and host system volumes with proper user/group mappings.</p>

Try this tool →
Effective Permission Calculator (User + Group + Others)

Effective Permission Calculator (User + Group + Others)

<p>A Linux tool to calculate the effective permissions for a user, considering user, group, and others permissions.</p>

Try this tool →

Stay Updated with Linux Tips

Get weekly tutorials, command references, and new tool announcements delivered straight to your inbox.