Master Advanced Shell Tricks to Supercharge Your Linux Workflow

1. Command‑Line Shortcuts: Speed Up Navigation

Use Ctrl+a to jump to the start of the line and Ctrl+e to jump to the end. Alt+b and Alt+f move a word backward or forward, roughly ten times faster than arrow keys.

History shortcuts include !! to repeat the previous command, !$ to reuse the last argument, and Ctrl+r for reverse incremental search.

Quick editing commands: Ctrl+w deletes the previous word, Ctrl+u clears everything before the cursor, and Ctrl+k clears everything after the cursor.

2. Pipes and Redirection: Master Data Flow

Combine output and error streams while saving to a file: cmd 2>&1 | tee log.txt Parse JSON directly from a curl request: curl -s http://example.com | jq .data Silence all output: >/dev/null 2>&1 Read input from a file instead of the keyboard: cmd < input.txt Process substitution example for comparing directory listings:

diff <(ls dir1) <(ls dir2)

3. Text Processing: One‑Liner Replacements for Excel‑Level Tasks

awk examples:

Print the last column: awk '{print $NF}' file.txt Count occurrences of each IP in an access log:

awk '{ip[$1]++} END {for (i in ip) print i, ip[i]}' access.log

sed examples:

Replace newlines with commas: sed ':a;N;$!ba;s/\n/,/g' file.txt Delete empty lines: sed '/^$/d' file.txt grep examples:

Show three lines after and two lines before a match: grep -A 3 -B 2 "error" log.txt Exclude lines containing a pattern:

grep -v "success" file.txt

4. Process Management: Take Full Control

Run a command in the background with cmd &. List background jobs with jobs and bring one to the foreground using fg %1. Use nohup cmd & to keep a process alive after SSH disconnects.

Signal handling shortcuts: Ctrl+z pauses a job, kill -9 PID force‑kills it, and pkill -f "pattern" kills by name. Monitor resources with htop and check which process occupies a port: lsof -i :8080.

5. Scripting Tricks: Eliminate Repetitive Work

Default values and substring extraction:

${var:-"default"}   # use default if var is empty
${str:0:5}           # first five characters of $str

Define reusable functions and aliases:

zipdir() { zip -r "$1.zip" "$1"; }
alias ll='ls -alh --color=auto'

Debugging flags: set -x prints each command as it runs, and set -e aborts the script on the first error.

6. File Operations: Bulk Rename and Cleanup

Find and delete logs older than seven days:

find /logs -name "*.log" -mtime +7 -exec rm {} \;

Change permissions for all shell scripts in the current directory:

find . -type f -name "*.sh" -exec chmod 755 {} \;

Batch rename extensions using the rename utility:

rename 's/\.txt$/.md/' *.txt

7. Lesser‑Known Power Tools

xargs parallel download example: cat urls.txt | xargs -P 4 -I {} curl -O {} SSH tunneling:

ssh -L 8080:localhost:80 user@remote   # forward remote port 80 to local 8080

tmux session management:

tmux new -s mysession          # create a new session
Ctrl+b "                        # horizontal split
Ctrl+b %                        # vertical split

8. Security and Permissions: Avoid Common Pitfalls

Configure password‑less sudo by adding the line username ALL=(ALL) NOPASSWD: ALL to /etc/sudoers (use with caution).

Find all SUID files (potential security risks):

find / -perm -4000 2>/dev/null

Conclusion: The Shell Philosophy

Automate everything : Anything you can script should be scripted.

Combine tools : Pipelines, redirections, and tool chaining are the core of Unix power.

Continuous learning : Master one new command each day and become a terminal wizard within a year.