Unix/Linux command setting file permissions: read (r), write (w), execute (x).

Owner: full access (7=rwx), group: read+execute (5=r-x), others: read+execute (5=r-x).

Files vs directories?

Files: 644 (owner write, all read). Directories: 755 (owner full, all read+execute).

What is the difference between chmod 755 and chmod 777?

chmod 755 gives the owner full access and others read+execute only. chmod 777 gives everyone full read, write, and execute access, which is a security risk and should almost never be used on servers.

What chmod permission should I use for website files and folders?

Use 644 for files (owner read+write, others read-only) and 755 for directories (owner full access, others read+execute). Never use 777 in production. Writable upload directories can use 775.

Chmod Calculator

Convert between symbolic and numeric file permissions

755

rwxr-xr-x

Owner

Write 2

Execute 1

Group

Write 2

Execute 1

Others

Write 2

Execute 1

Or enter numeric mode:

Command

chmod 755 filename

777

Full access

755

Standard exec

644

Standard file

600

Private file

700

Private exec

666

Read/write all

444

Read only

400

Owner read

About File Permissions

In Unix/Linux systems, file permissions control who can read, write, or execute files.

Permission Values:

4 = Read (r), 2 = Write (w), 1 = Execute (x)

Common Examples:

755 - Owner can do everything; others can read/execute (typical for scripts)

644 - Owner can read/write; others can only read (typical for files)

600 - Only owner can read/write (private files like SSH keys)

Chmod Calculator

Owner

Group

Others

Command

About File Permissions

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