Linux System Administration & Automation 🐧⚙️

✅ What I worked on:

🔹 User & Group Management

• Created users and groups

• Configured sudo access

• Restricted SSH access for better security

🔹 File & Directory Permissions

• Applied precise permission controls using chmod and chown

• Verified access using ls -l

🔹 Log File Analysis (AWK, grep, sed)

• Searched errors with grep

• Extracted timestamps & log levels using awk

• Masked IP addresses with sed

• Identified most frequent log entries

🔹 Volume & Disk Management

• Mounted storage under /mnt

• Verified mounts using df -h and mount

🔹 Process Monitoring

• Managed background processes

• Monitored using ps, top, and htop

• Safely terminated processes

🔹 Shell Scripting & Automation

• Wrote a backup script using tar

• Added colored success output

• Automated backups using cron

💡 This week strengthened my understanding of how Linux powers real DevOps environments, from security and monitoring to automation.

📌 I’ll be sharing commands, scripts, and learnings soon on GitHub / Blog.

#90DaysOfDevOps

#LinuxAdmin

#DevOps

#ShellScripting

#Automation

#SysAdmin

#LearningInPublic

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🧠 (Optional) GitHub / Blog – Command Highlights

# User & Group
sudo useradd devops_user
sudo groupadd devops_team
sudo usermod -aG devops_team devops_user
sudo usermod -aG sudo devops_user

# Permissions
mkdir /devops_workspace
touch /devops_workspace/project_notes.txt
chmod 640 project_notes.txt

# Log Analysis
grep -i "error" Linux_2k.log
awk '{print $1, $2, $3}' Linux_2k.log
sed -E 's/[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/[REDACTED]/g' Linux_2k.log

# Process
ping google.com > ping_test.log &
ps aux | grep ping
kill <PID>

# Backup Script
tar -czvf backup_$(date +%F).tar.gz /devops_workspace