010-160 Command Line Navigation 4

Question 1

Which special shell variable holds the exit status of the last executed command?

Accepted Answer

$?

Answer

`$?` contains the exit status of the most recently executed foreground command; 0 means success.

Question 2

What does pressing Tab once do in the bash shell when typing a command?

Accepted Answer

Attempts to auto-complete the command or filename

Answer

Tab completion in bash automatically completes the command name, filename, or path if there is an unambiguous match.

Question 3

Which command shows the manual page (documentation) for a given command?

Accepted Answer

man

Answer

`man <command>` opens the manual page for that command, providing detailed usage information and options.

Question 4

In the output of `ls -l`, what does the first character of the permission string indicate?

Accepted Answer

The file type (e.g., - for regular, d for directory)

Answer

The first character in `ls -l` output indicates the file type: `-` for regular file, `d` for directory, `l` for symbolic link.

Question 5

Which key combination cancels the current command line input in bash?

Accepted Answer

Ctrl+C

Answer

Ctrl+C sends SIGINT to the foreground process, canceling the current command or interrupting a running program.

(010-160) LPI Linux Essentials Practice Test