Common Linux Commands

1. Processes

1.1. top

• top

1.2. vmstat

• vmstat

1.3. ps

• ps

1.4. pstree

• pstree

1.5. ulimit

• ulimit

1.6. systemd

• systemd

1.7. pidstat

pidstat

1.8. perf

perf

2. Memory

2.1. free

• free

3. Disk

3.1. df

• df

3.2. iostat

• iostat

3.3. lsof

lsof

3.4. strace

strace

3.5. chroot

chroot

3.6. Text

• The cat command can display an entire file at once. If the file is relatively large, it is not very convenient to use.
• The more command can pause when the screen fills. Press Space to page forward and b to page backward.
• The less command can also display files page by page. The differences from more are:
  • It supports scrolling with the up/down keys and searching.
  • It does not need to read the entire file at the beginning, so it opens large files faster than more or vim.
• The head command is used to view the first n lines of a file.
• The tail command is used to view the last n lines of a file. With the -f option, it is very convenient for viewing online logs because it can print newly added log lines.
  • tail -f grep –color -A xxx -B xxx

3.7. Copying

3.7.1. scp

scp

3.7.2. rsync

rsync

4. Networking

4.1. ifstat

• ifstat

4.2. netstat

• netstat

4.3. ifconfig

• ifconfig

4.4. Test Host Connectivity

• curl tests HTTP.

curl https://www.baidu.com:443

• telnet tests TCP.

telnet www.baidu.com 80

4.5. traceroute

traceroute

4.6. dig

dig

4.7. nslookup

nslookup

4.8. nethogs

nethogs

4.9. sar

sar

4.10. Packet Capture

• tcpdump

5. References

• Troubleshooting Linux Performance Bottlenecks - CSDN
• Detailed Explanation of CPU Information in the Linux top Command - CNBlogs
• Tool Reference — Linux Tools Quick Tutorial
• Detailed Explanation of Linux ulimit | Otokaze’s Blog
• Summary of the Maximum Number of File Handles in Linux - ITeye
• Comparison of cat, less, more, head, and tail Commands - CSDN
• Difference Between buffer and cache Shown by vmstat - CSDN
• 008 Detailed Explanation of the top Command, Linux Basic Commands (4) - Bilibili