Command:

Explanation:

• chmod: The command used to change file permissions.
• 755: The permission set for the file:
  • 7 (Owner): Read (4), Write (2), Execute (1) — Total: 7
  • 5 (Group): Read (4), Execute (1) — Total: 5
  • 5 (Others): Read (4), Execute (1) — Total: 5
• filename: The name of the file whose permissions you want to modify.

Result:

This command will grant the owner read, write, and execute permissions (rwx), while the group and others will only have read and execute permissions (rx).

If you need to set different permissions, replace 755 with the appropriate numeric value (e.g., 644 for read/write for owner and read-only for group and others).