45 Essential Linux Command Combos for Everyday Ops: Boost Efficiency

This guide compiles 45 high‑efficiency Linux command combinations covering seven frequent operational scenarios, which can address about 99% of daily sysadmin tasks.

✅ 1. Batch File Operations

Batch creation: touch haodao{1..100}.py

Quickly generate large files: dd if=/dev/zero of=test.txt bs=1M count=1024

Five ways to empty a file: > file , truncate -s 0 file , cat /dev/null > file , etc.

✅ 2. Advanced find Search & Cleanup

Search by name, type, permission, size, or time: find . -name "*.py" (by suffix) find . -type f -perm 777 (by permission) find . -size +100M -size -1G (by size range) find . -mtime +7 -name "*.py" | xargs rm -rf (by time + name)

✅ 3. System Resource Monitoring

View CPU model and core count: cat /proc/cpuinfo | grep name | uniq -c

Top 20 memory/CPU consuming processes: ps aux | sort -rnk 4 | head -20 ps aux | sort -rnk 3 | head -20

Run command in background: nohup cmd > /dev/null 2>&1 &

✅ 4. Log and Access Analysis

Tomcat log analysis examples: awk '{print $4,$1}' access.log | grep "11/Dec/2022:09" (count IPs in a time window) awk '{print $1}' access.log | sort | uniq -c | sort -nr | head -20 (top 20 IPs) grep ^IP access.log | awk '{print $7}' (pages visited by an IP)

✅ 5. Text Processing & Replacement

sed tricks: Replace string: sed -i 's/haodao/HAODAO/g' file.py Replace path: sed -i 's:/etc/dhcp:/home:g' file.py Add/remove content at line start/end, delete comments, insert before/after specific lines, etc.

✅ 6. Network Capture & Port Analysis

Precise tcpdump capture: Capture specific port: tcpdump -i ens33 port 8080 -n Capture IP range: tcpdump portrange 80-443 -i ens33 -n Capture ICMP from source IP: tcpdump icmp and src 192.168.20.231 -i ens33 -n

Top IPs connecting to a port: netstat -anlp | grep 80 | awk '{print $5}' | awk -F: '{print $1}' | sort | uniq -c | sort -nr | head -15

✅ 7. Disk & Directory Cleanup

Find large files in /var: du -xBM --max-depth=2 /var | sort -rn | head -20

Top 10 large files in current directory: du -s * | sort -n | tail

✅ One‑Sentence Summary

45 command combos form a full‑stack ops toolbox—file handling, system monitoring, log analysis, network troubleshooting, text processing, disk cleanup, and packet filtering—that can solve about 99% of everyday Linux administration scenarios.