For each permission requirement below, provide (1) symbolic permission and (2) 4-digit octal (numeric) permission. You should give your answer for “Symbolic permission?” and “Numeric permission?” clearly (Do not give your answer in a text sentence that could be hard to find).

For a file named “a.png”,

Owner: can read and write

Group: can read

World: Forbidden

Symbolic permission?

Numeric permission?




For a file of “b.txt”,

Owner: can read, write, and execute

Group: can read, write, and execute

World: can read and execute

Set group ID bit enabled

Symbolic permission?

Numeric permission?




For a directory of “dir1”,

Owner: can read, write, and execute

Group: can read and execute

World: can read and execute

Symbolic permission?

Numeric permission?




For a file named “passwd”,

Owner: can read, write, and execute

Group: can read and execute

World: can read and execute

Set user ID bit enabled

Symbolic permission?

Numeric permission?





For a directory of “dir2”,

Owner: can read, write, and execute

Group: can read, write, and execute

World: can read, write, and execute

Sticky bit enabled

Symbolic permission?

Numeric permission?