Top 10 commands for DevOps professionals | LinuxGist
Top 10 commands which every DevOps professional will find very useful.
Here are ten powerful Linux commands that DevOps professionals often find useful, along with detailed usage and examples:
1. grep
The grep command is used to search text or files using patterns.
Usage:
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grep <pattern> <file>
Example: Search for the word “error” in a log file:
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grep "error" /var/log/syslog
2. awk
The awk command is used for pattern scanning and processing.
Usage:
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awk '/pattern/ { action }' <file>
Example: Print the second column of a CSV file:
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awk -F, '{print $2}' data.csv
3. sed
The sed command is used for stream editing of text.
Usage:
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sed 's/old/new/' <file>
Example: Replace “hello” with “world” in a file:
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sed -i 's/hello/world/g' message.txt
4. curl
The curl command is used for transferring data from or to a server.
Usage:
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curl <URL>
Example: Fetch and display the content of a webpage:
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curl https://www.example.com
5. git
Git is a distributed version control system.
Usage:
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git <command> <arguments>
Examples:
- Clone a repository:
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git clone https://github.com/user/repo.git
- Add and commit changes:
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git add . git commit -m "Update documentation"
6. ssh
The ssh command is used for secure remote login.
Usage:
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ssh <user>@<hostname>
Example: Log in to a remote server:
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ssh user@remote-server
7. df
The df command is used to display disk space usage.
Usage:
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df -h
Example: Display disk space in a human-readable format:
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df -h /home
8. du
The du command is used to estimate file space usage.
Usage:
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du -sh <directory>
Example: Estimate the disk usage of a directory:
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du -sh /var/log
9. rsync
The rsync command is used for fast, versatile, and remote file transfer.
Usage:
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rsync <source> <destination>
Example: Sync files from a local directory to a remote server:
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rsync -avz /home/user/documents/ user@remote-server:/backup/
10. top
The top command is used for real-time system monitoring.
Usage:
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top
Example: Display real-time CPU and memory usage:
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top
These commands are fundamental tools in DevOps for automating tasks, managing systems, and working with version control.