21crontabThis demonstrates scheduling a task using cron syntax to run a command daily at 6:15 AM.15 6 * * * fooexternal toolscroncrontab
23bashThis demonstrates listing all scheduled tasks using the at command.at -lexternal toolsattask scheduling
24bashThis demonstrates secure file transfer between machines using the scp command.scp foo.txt ubuntu@hostname:/home/ubuntuexternal toolsscpfile transfer
25bashThis demonstrates inspecting the content of a scheduled task using the at command.at -c 1external toolsattask inspection
26bashThis demonstrates scheduling a one-time task to run in 2 minutes using the at command.at now + 2 minutesexternal toolsatone-time scheduling
27bashThis demonstrates using the whereis command to locate the binary, source, and manual page files for the wget command.whereis wgetexternal toolswhereiscommand location
28bashExtract the word "lazy" from the sentence "The quick brown fox jumps over the lazy dog." using sed. This demonstrates how to use sed to capture and print a specific part of a string based on a pattern.echo "The quick brown fox jumps over the lazy dog." | sed -n "s|.*the \(.*\) dog.*|\1|p"external toolssed
29bashThis demonstrates attaching to an existing tmux session by specifying the target session ID.tmux attach -t 0external toolstmuxsession managementsession attachment
30bashThis demonstrates using the mv command to move or rename a file.mv s0urc3.txt dst.txt # sorry, l33t hackers...external toolsmvfile operationsmove or rename
31bashThis command lists all active screen sessions in a terminal multiplexer environment.screen -lsexternal toolsscreensession managementlist sessions
32bashThis demonstrates connecting to a remote server using SSH.ssh hostnameexternal toolssshremote connection
33bashThis demonstrates using find to locate and delete specific files.find /path -name foo.txt -deleteexternal toolsfindfile deletion
34bashThis demonstrates reattaching to a detached screen session using the screen command.screen -R 31166external toolsscreensession managementreattach session
35bashThis demonstrates using the tail command to view the last 10 lines of a file.tail -n 10 file.txtexternal toolstailfile tailing (viewing end of file)
36bashThis script sorts the contents of random_order.txt and removes duplicate lines.sort random_order.txt | uniqexternal toolsuniq
37bashThis demonstrates using the netstat command to list all listening ports on the system for network troubleshooting.netstat --listeningexternal toolsnetstatnetwork monitoringlist listening ports
38bashThis demonstrates using grep to filter lines based on a regular expression.grep "^foo.*bar$" file.txtexternal toolsgrepregex filter (regular expression filter)
39bashThis demonstrates using the traceroute command to trace the network path to a specified destination, useful for diagnosing network issues.traceroute example.comexternal toolstraceroutenetwork diagnostics
40bashThis demonstrates connecting to a remote server using SSH with a private key for authentication.ssh -i foo.pem hostnameexternal toolssshremote accesskey-based authentication