NOC Knowledge Base
Enterprise Linux Commands
A curated reference of essential commands for troubleshooting, networking, and securing production environments.
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SysAdmin Quick References
Essential bash shortcuts and critical system paths for rapid debugging.
Bash Survival Shortcuts
Reverse Search
Ctrl + R
Suspend Job
Ctrl + Z
Interrupt Process
Ctrl + C
Clear Screen
Ctrl + L
Go to Start of Line
Ctrl + A
Go to End of Line
Ctrl + E
Repeat Last Command
!!
Run Last as Sudo
sudo !!
Critical File Paths
Auth / Security Logs
/var/log/secure (or auth.log)
System Mounts
/etc/fstab
Nginx Configuration
/etc/nginx/nginx.conf
Systemd Services
/etc/systemd/system/
Cron Directory
/var/spool/cron/
Critical Incident Escalation
Commands not fixing the issue?
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