Understanding the /etc/passwd File
The etc/passwd file is a text file with one entry per line, representing a user account. Each line of the file contains seven comma-separated fields.
Diff Command in Linux
diff is a command-line utility that allows you to compare two files line by line. It can also compare the contents of directories.
How to Mount Windows Share on Linux using CIFS
On Linux and UNIX operating systems, a Windows share can be mounted on a particular mount point in the local directory tree using the cifs option of the mount command.
W Command in Linux
w is a command-line utility that displays information about currently logged in users and what each user is doing.