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Understanding the chmod Command in Linux

In Linux, every file has permissions that define who can read, write, or execute it. The chmod command allows you to change these permissions easily.

How Does chmod Work?

The syntax is simple: chmod XYZ filename

• X sets permissions for the owner of the file
• Y sets permissions for the group
• Z sets permissions for others

Each number represents a permission level:

• 7 → Read (r), Write (w), Execute (x) (full access)
• 4 → Read-only (r--)
• 5 → Read & Execute (r-x)
• 6 → Read & Write (rw-)
• 0 → No permissions (---)

Example: chmod 744 script.sh

If you run: chmod 744 script.sh

you are setting these permissions:

• The owner can read, write, and execute (7 → rwx).
• The group can only read (4 → r--).
• Everyone else can only read (4 → r--).

This is a common setting for scripts, ensuring that only the owner can modify and run the file, while others can only view it.

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