Efficient Linux Command Cheat Sheet

This article provides a concise collection of practical Linux command-line tricks aimed at improving daily workflow efficiency for system administrators and developers.

It starts with a quick method to create multiple files of the same type using brace expansion:

touch haodao{1..100}.py

To generate a large test file, the dd command can be used:

dd if=/dev/zero of=/root/haodaolinux/test.txt bs=1M count=1024

Several ways to truncate or clear a file are presented, for example:

cat /dev/null > haodao.py

echo -n "" > haodao.py

true > haodao.py

: > haodao.py

truncate -s 0 haodao.py

File searching examples include locating a specific file, all .py files, files with certain permissions, and size ranges:

find . -name haodao.py

find . -name "*.py"

find . -type f -perm 755

find . -type f -size +100M -size -1G

Process management snippets show how to run commands in the background with nohup and how to kill processes matching a name pattern:

nohup ping www.baidu.com &

ps aux | grep xxx | grep -v grep | awk '{print $2}' | xargs kill -9

Network traffic capture examples using tcpdump demonstrate filtering by interface, protocol, source/destination IP, and port ranges:

tcpdump -i ens33 -s 0 -w haodao.cap

tcpdump icmp and src 192.168.20.231 -i ens33 -n

Finally, the article includes useful sed one‑liners for in‑place text replacement, line deletion, and insertion.