Bash

Tune Linux VM memory behavior by adjusting vfs_cache_pressure, dirty_ratio, and swappiness to reduce unnecessary swapping and improve I/O throughput.

A quick bash one-liner that pulls per-user CPU time, connection counts, and active session details from MySQL’s INFORMATION_SCHEMA and processlist tables.

Learn how to check and interpret the kernel entropy pool on Linux, why low entropy can slow down SSL handshakes and SSH sessions, and what to do when the pool runs dry.

Pipe the mount command through column -t to get a clean, aligned table of all mounted filesystems. A quick sysadmin trick for scanning devices, mount points, and options at a glance.