Essential Command-Line Tools Every DevOps Engineer Should Know

This guide introduces a set of command‑line utilities that can significantly improve productivity for developers and system administrators.

Fast Search and Navigation

ag : A faster recursive search tool compared to grep or ack for finding text inside files.

tig : An interactive, character‑mode interface for browsing Git repositories, serving as a visual alternative to raw Git commands.

fzf : A fuzzy finder that enables interactive, smart searching of files or command history, perfect for pairing with Ctrl‑R in the terminal.

PathPicker (fpp) : Detects directories and files in command output and allows interactive selection; useful with Git, e.g., git diff HEAD~8 --stat | fpp.

Database and JSON Utilities

mycli : A MySQL client offering syntax highlighting and command completion, similar to IPython, to replace the default mysql CLI.

jq : Processes and pretty‑prints JSON files with syntax highlighting, acting as a drop‑in replacement for python -m json.tool.

Code Quality and Formatting

shellcheck : A static analysis tool for shell scripts that detects syntax errors and non‑standard constructs.

yapf : Google’s Python code formatter supporting PEP‑8 and Google style guidelines.

ccache : A compiler cache for C/C++ that speeds up repeated builds; use it by prefixing compilation commands, e.g., ccache gcc foo.c.

Network and Remote Access

mosh : A UDP‑based replacement for SSH that maintains stable connections and automatically reconnects when the IP changes.

axel : A multithreaded download accelerator that can replace curl or wget. Example: axel -n 20 http://example.com/file.iso.

sz/rz : Interactive file transfer tools that simplify copying files across multiple jump hosts.

System Monitoring

htop : An improved, colorful process monitor that replaces the traditional top command.

tmux : A terminal multiplexer that supersedes screen and nohup. It also supports session recording with script and playback via scriptreplay.

you-get : A powerful media downloader supporting YouTube, Youku, Bilibili, and many other platforms.

Clipboard and Speech Utilities (macOS)

cat test.sh | pbcopy

: Copies command output to the system clipboard. pbpaste: Pastes clipboard contents back into the terminal.

for i in `say -v '?' | cut -d '' -f 1`; do echo $i && say -v "$i" "Hello World"; done

: Demonstrates macOS say command with multiple voices.

Command Correction

The tool The Fuck automatically corrects mistyped commands (e.g., turning aptget into apt-get), though it does not add missing sudo automatically.

Additional Recommended Ops Tools

Other useful utilities mentioned include hardware info tools ( i7z, hardinfo), system overview ( screenfetch), network monitoring ( nethogs, nload, bmon), disk usage analysis ( ncdu), security scanners ( nmap, Nessus), container helpers ( anbox), and many classic Unix commands such as grep, awk, sed, dd, find, tar, etc. The article lists dozens of these tools with brief descriptions, providing a handy reference for anyone looking to enhance their command‑line workflow.