Linux: Switch to nologin User

unix linux
Explains how to switch and execute commands or scripts as a user with the nologin shell on Linux.

Linux: Check Inode Usage

unix linux
Explains how to get the inode usage count and the number of free inodes on a Linux system. Also covers how to find inode number of a file and search for a file using a inode number.

Bash: Multi-dimensional Arrays

shell script
Learn how to simulate a multi-dimensional array in bash using an associate array with clever use of the hash key. Bash 4 only provides one-dimensional indexed and associative array variables.

Linux: Restrict su to Group

unix linux
Explains how to restrict the use of su command to a limited number of users belonging to a group.