RHCSA RHCSA Essential Command-Line Tools 4

Question 1

What does the redirection operator '>>' do?

Accepted Answer

Appends stdout to a file without overwriting

Answer

>> appends standard output to the end of a file, preserving existing content.

Question 2

Which command lists all environment variables currently set in the shell?

Accepted Answer

env

Answer

env without arguments prints all environment variables and their values to stdout.

Question 3

When using 'find', what does '-mtime -2' mean?

Accepted Answer

Files modified within the last 2 days

Answer

In find, -mtime -2 selects files whose modification time is less than 2*24 hours ago (within the last 2 days).

Question 4

What does 'chmod 755 script.sh' set on the file?

Accepted Answer

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

Answer

Octal 7=rwx, 5=r-x, so 755 gives the owner full permissions and group/others read+execute.

Question 5

Which command creates a hard link named 'link1' pointing to 'file1'?

Accepted Answer

ln file1 link1

Answer

ln without -s creates a hard link; both names refer to the same inode on the same filesystem.

RHCSA Exam Practice Test