This guide shows how to write Bash functions that retrieve process IDs, CPU, memory, file‑descriptor usage, port status, system load and disk space on a Linux server, and how to combine them with conditional checks to generate alerts when thresholds are exceeded.
A shebang (#!) line placed at the start of a script tells the operating system which interpreter to use, can include optional arguments, and may employ the env command to locate the executable, with variations such as hashbang, pound‑bang, and hash‑pling.
This guide explains how to achieve second‑level scheduling on Linux by combining a minute‑based crontab entry with a custom Bash script that loops and uses sleep, including a PHP test task example and step‑by‑step setup instructions.
Learn how to use the Linux script command to capture all terminal output, specify custom log files, employ options for silent or append mode, and automate recording via shell profiles for collaboration and remote session monitoring.
Learn why a Bash script that reads IPs from a file and uses SSH in a while loop only processes the first host, and discover two reliable solutions—switching to a for loop or adding the -n option to SSH—to ensure all servers are queried correctly.
