10 Linux Command every Software Engineer should know.

Summary

Key Points

• —The `top` and `htop` commands are crucial for real-time monitoring of system performance, including CPU and memory utilization, and active processes. 1:01
• —The `ps` command, along with its extensions like `pgrep` and `pstree`, is used to list running processes, their PIDs, and visualize process hierarchies, which is helpful for understanding process relationships and troubleshooting unknown processes. 4:10
• —The `netstat` command is essential for inspecting network connections and identifying which ports are in use, aiding in resolving 'port already in use' errors. 8:18
• —TCP dump is a powerful tool for capturing and analyzing network packets to diagnose connectivity issues and latency problems. 10:05
• —The `df -h` command is used to check overall disk space utilization, while `du -sh` helps determine the disk space usage of specific directories. 16:54
• —The `free -h` command provides a quick overview of the system's memory utilization, showing total, used, and free memory. 17:25
• —Journalctl is used to access and analyze system logs, particularly for services managed by systemd, which is invaluable for troubleshooting service issues. 18:23
• —The `lsof` command (list open files) is used to identify which process is using a specific port, crucial for resolving port conflicts. 20:48
• —Tail and head commands are fundamental for log analysis, allowing users to view the last (tail) or first (head) lines of large log files. 23:31
• —Ctrl+R (or Command+R on Mac) is a highly useful shortcut for reverse searching command history, enabling quick retrieval of previously executed commands. 26:59
• —The PS1 environment variable can be modified to customize the command prompt, enhancing the user interface for better readability or personalization. 28:08
• —Ping and traceroute are used to check network latency and trace the path of network requests to external resources, helping to identify where delays occur. 29:38