linuxexpert-practice-labs/labs/rhcsa/1-1-shell-and-redirection

RHCSA 1.1: The shell and redirection

Sending output and errors to different files, appending, counting with a pipe, and writing to a root-owned file with sudo.

Before you start

The lab removes the files the tasks write in /tmp, and any test.example.com line in /etc/hosts. Do tasks 1 to 3 as your normal user, not as root.

Tasks

1. Run ls /etc/hostname /nonexistent so that normal output goes to /tmp/ok.txt and the error goes to /tmp/errors.txt.
2. Append the current date to /tmp/log.txt three times without opening an editor.
3. Save a list of every file under /etc whose name ends in .conf to /tmp/confs.txt, with no error messages in it, and show the number of files on the screen.
4. As a normal user, add the line 192.0.2.50 test.example.com to /etc/hosts with sudo but without opening an editor.

Hints

• > and 2> send the two streams to different files.
• >> appends; date >>file.
• find /etc -name '*.conf', 2>/dev/null, tee, wc -l.
• sudo echo ... >>/etc/hosts fails: the shell opens the file, not sudo. | sudo tee -a.