27 Essential Linux Command‑Line Tricks to Boost Your Productivity

Cautious File Deletion

Use rm -i to request confirmation before removing files; many admins set this as an alias.

Disable Aliases Temporarily

Run unalias rm to turn off the rm alias for the current session, or place the command in ~/.bashrc to re‑enable it later.

Convenient sudo Usage

Repeat the last command with sudo by typing sudo !!, or create aliases such as alias update='sudo apt update' to prepend sudo automatically.

More Complex Tricks with Functions

Define shell functions in .bashrc for richer behavior. Example function creates a directory and immediately cd’s into it:

md() { mkdir -p "$@" && cd "$1"; }

Command Editing and Cursor Movement

Ctrl+U

deletes from the start of the line to the cursor. Ctrl+K deletes from the cursor to the end of the line. Ctrl+A moves the cursor to the beginning; Ctrl+E to the end. Alt+F and Alt+B move forward/backward one word. Ctrl+W deletes the word before the cursor.

History‑Based Quick Execution

Use !<em>n</em> (where n is a history number) to rerun a previous command, or !! for the most recent one.

Real‑Time Log Viewing

Run tail -f filename.log to follow a log file live; less with Shift+F achieves the same effect.

Disk and Memory Inspection

Check mounted filesystem usage with df -h and overall memory with free -h. The -h flag makes sizes human‑readable.

Process Identification and Management

Find a PID by name: pgrep hello or pidof hello.

Terminate by name: killall hello or pkill hello.

View Process Runtime

Show start time and elapsed time with ps -p 24525 -o lstart,etime.

Directory Navigation Shortcuts

cd -

returns to the previous directory; cd alone jumps to the home directory.

Multiple Commands in One Line

Separate commands with ; (executes regardless of previous success) or use && to run the next command only if the prior one succeeds.

Viewing Compressed Logs

Use zcat test.gz or zless test.gz to read gzipped logs without manual decompression.

Clearing File Contents

Truncate a file instantly with >filename.

Logging While Displaying Output

Pipe a script’s output through tee to write to a log file and still see it on the console: ./test.sh | tee test.log.

Suspend and Resume Processes

Press Ctrl+Z to suspend; resume with fg (foreground) or bg (background).

Measure Program Execution Time

Wrap a command with time to see real, user, and system durations, e.g., time ./fibo 30.

Top Memory‑Consuming Processes

List the ten processes using the most memory: ps -aux | sort -k4nr | head -n 10.

Search for Commands

Find commands related to a keyword with man -k "copy files", which lists matching manual entries.

Copy‑Paste in Terminal

Use Ctrl+Insert to copy and Shift+Insert to paste.

Search Files for a String

Locate files containing a pattern: grep -rn "test" . shows filename and line number.

Freeze/Unfreeze Terminal Output

Press Ctrl+S to pause output (XOFF) and Ctrl+Q to resume (XON).

Edit Files Without an Editor

Redirect input to a new file with cat >file.txt, type content, then press Ctrl+D to save.

Inspect ELF Files

Show ELF header: readelf -h filename.

Search for a symbol: nm filename | grep interface.

Command Line Editing Shortcuts

Move to line start/end with Ctrl+A / Ctrl+E. Use ^old^new^ to replace text in the previous command and re‑execute.

Alias for Remote SSH Login

Create a shortcut like alias butterfly='ssh -v -l jdoe 192.168.0.11' and store it in ~/.bashrc for persistent use.

Reuse Commands from History

!!

– repeat the last command. !ec – repeat the most recent command starting with “ec”. !76 – repeat command number 76 from history.

Live Log Monitoring

Continuously display new log entries with tail -f /var/log/syslog.