DevOps
15 Advance Linux Commands Every Devops Should Know
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Every Devops professional should be aware about these commands because most production servers run on Linux operating systems. These Linux commands will help you to immediately gain insights into system health, monitoring and performance.
Commands
1) htop
Usage: Interactive process viewer that’s much more advanced than top.
Command: htop
Description: Shows processes, memory, and CPU usage in a user-friendly, color-coded layout.
2) nmap
Usage: Network mapping and discovery.
Command: nmap -sP 192.168.1.0/24
Description: Scans a network range to identify active devices.
To install on Linux, install the nmap package e.g. apt-get install nmap
To install on macOS or Windows, see the nmap.org Download page.
3) rsync
Usage: Syncs directories and files locally or across networked systems.
Command: rsync -av /source /destination
Description: Great for backups and maintaining directories across systems.
4) tmux
Usage: Terminal multiplexer allowing multiple sessions.
Command: tmux
Description: Enables you to switch between several programs in a single terminal.
5) awk
Usage: Text processing and data extraction from files.
Command: awk '{print $1}' oneclick.txt
Description: Powerful for extracting and formatting text data.
6) dig
Usage: DNS lookup tool.
Command: dig oneclickitsolution.com
Description: Provides DNS information for domain troubleshooting.
7) tcpdump
Usage: Packet sniffer for network troubleshooting.
Command: sudo tcpdump -i eth0
Description: Allows monitoring of incoming and outgoing packets.
8) lsof
Usage: Lists open files and the processes using them.
Command: lsof -i :80
Description: Essential for diagnosing file locks and network usage.
9) jq
Usage: Processes JSON data.
Command: jq '.' oneclick.json
Description: Parses and formats JSON data from files or APIs.
10) strace
Usage: Traces system calls and signals.
Command: strace -p <PID>
Description: Useful for debugging by tracing system calls from a process.
11) iftop
Usage: Monitors bandwidth usage per IP.
Command: sudo iftop
Description: Real-time network traffic monitoring by IP address.
12) grep -r
Usage: Searches text within files recursively.
Command: grep -r 'search-term' /path/to/directory
Description: Locates specific text across directories, useful for log analysis.
13) ip a
Usage: Displays network interfaces and IP address configuration.
Command: ip a
Description: Essential for managing network settings on modern Linux systems.
14) iostat
Usage: Monitors CPU and I/O statistics.
Command: iostat -x 1
Description: Helps in understanding disk and CPU usage patterns over time.
15) atop
Usage: Monitors system performance.
Command: atop
Description: Provides a detailed look at processes, memory, disk, and network.
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