Master Essential Linux Command-Line Tricks for Faster Sysadmin Work

TOP-1: Cursor Movement Shortcuts

Recommendation: ★★★★★

Scenario: When a command line is long and you need to edit specific parts.

Ctrl + a Move cursor to the beginning of the line</code>
<code>Ctrl + e Move cursor to the end of the line</code>
<code>Ctrl + w Delete the word before the cursor</code>
<code>Esc + b Move left by one word</code>
<code>Esc + f Move right by one word

TOP-2: Vim Quick Operations

Recommendation: ★★★★★

Scenario: Editing configuration files efficiently.

All commands assume you are in Vim’s command mode (press Esc first if unsure).

:set nu Show line numbers</code>
<code>:20 Jump to line 20</code>
<code>:%s/aaa/bbb/g Replace all occurrences of "aaa" with "bbb"</code>
<code>ddp Swap the current line with the next line</code>
<code>ci" Delete everything inside double quotes (use <code>ci'</code> for single quotes)

TOP-3: Return to the Previous Directory

Recommendation: ★★★★★

Scenario: Quickly toggle between two directories. cd - Switch to the last visited directory Running the command again returns you to the original directory.

TOP-4: Cross‑Server File Copy Without Password

Recommendation: ★★★

Scenario: Transfer files between servers when you cannot use scp because the remote password is unknown.

Method 1 – Netcat:

# On the source machine
nc -l 10017 < abc.sh
# On the destination machine
nc 1.1.1.1 10017 > abc.sh

Method 2 – Simple HTTP Server:

# On the source machine
python -m SimpleHTTPServer 10010
# On the destination machine
wget http://1.1.1.1:10010/abc.sh

TOP-5: Simplify Command Output Redirection

Recommendation: ★★★★★

Scenario: Clear a file’s contents or create a new empty file (useful for truncating large logs).

> a.log Truncate <code>a.log</code> if it exists, or create an empty <code>a.log</code>

Appending Ctrl + C after this command stores any buffered output into a.log.

TOP-6: Retrieve Local In‑tranet IP

Recommendation: ★★★★

Scenario: Need to know the machine’s internal IP address.

hostname -i Display the machine’s internal IP

Note: This works only on hosts with DNS resolution; hostname changes the host name, while host queries DNS records.

TOP-7: Quick Redis Connection Without Client

Recommendation: ★★★★

Scenario: When a Redis client is unavailable, use telnet for simple queries.

telnet 127.0.0.1 6379 Connect to a local Redis instance

Use telnet <host> <port> for remote instances. For production, prefer a proper Redis client such as redis-cli.

TOP-8: Send a Job to the Background

Recommendation: ★★★★★

Scenario: While editing a script in Vim, you need to run a command without leaving the editor.

Ctrl + z Suspend the current foreground job (e.g., Vim)</code>
<code>fg Resume the suspended job

Example: Edit vim /abc/aaa.py, press Ctrl+z, run python aaa.py, then type fg to return to Vim.

TOP-9: Locate the Directory of a Running Process

Recommendation: ★★★★★

Scenario: Find where the executable file of a process resides.

pwdx <pid> Show the working directory of the given process ID

Replace <pid> with the actual process ID (e.g., the PID of python test.py).

TOP-10: Save Command Output While Still Viewing It

Recommendation: ★★★★★

Scenario: Run a script, keep a log file, and watch the output live.

python test.py | tee a.log Execute the script, display output, and write it to <code>a.log</code> simultaneously

Alternatively, you can redirect to a file and tail it in another terminal, but tee does it in a single window.

These ten tips provide a compact toolbox for everyday Linux terminal work, helping administrators and developers operate more efficiently and avoid repetitive manual steps.