010-160 Linux Command Line & Shell Scripting 3

Question 1

What does the chmod 755 filename command set as permissions?

Accepted Answer

Owner: rwx, Group: r-x, Others: r-x

Answer

7=rwx for owner, 5=r-x for group, 5=r-x for others.

Question 2

Which command shows the manual page for the ls command?

Accepted Answer

man ls

Answer

The man command opens the manual page for any installed command.

Question 3

In bash, how do you define a function named greet?

Accepted Answer

function greet() { ... }

Answer

The bash syntax for a function is: function name() { commands; } or name() { commands; }.

Question 4

What does the command wc -l file.txt report?

Accepted Answer

Line count

Answer

wc -l counts the number of newline characters, effectively reporting the number of lines.

Question 5

Which command removes an alias named ll that was set in the current shell session?

Accepted Answer

unalias ll

Answer

The unalias command removes a previously defined alias from the current shell.

(010-160) LPI Linux Essentials Practice Test