Time and Date:

• cal
• date

Disk Usage or File Size:

• df -h
• du -sh*

System Performance:

• top

Exploring:

• pwd
• ls -lah
• cd /tmp cd ~
• which python3

Viewing Files:

• less /etc/password
• cat /etc/password

Counting lines:

• wc -l /etc/passwd

• touch newfile.txt
• mkdir newdir
• mkdir -p moredir/dir1/dir2
• rm -rf moredir

• ps
• ./sleeper.sh &
• fg 1

Let's practice some common shell commands

Part 1: Navigate the file system

cd into the foo directory Part 2: Create a file with touch

Run the command again? What happens? Part 3: Remove files and directories

Make a file and then delete it: touch bar.xt then run rm bar.txt Part 4: List files list the contents of /usr/bin by running the command ls -l /usr/bin What did you see?