Though I’m using RHEL8 for this post, almost everything applies to other Linux distributions as well.
whoami- shows the name of the current user
hostname- shows the name of the host
uname -a- information about the kernel, build, and platform
passwd- manage password
touch- create a new file and change the timestamp
date- shows the current date and time and you can also set the current date and time.
last- all the users that have logged into your system last.
[bk@rhel ~]$ whoami bk [bk@rhel ~]$ hostname rhel [bk@rhel ~]$ uname -a Linux rhel 4.18.0-240.el8.x86_64 #1 SMP Wed Sep 23 05:13:10 EDT 2020 x86_64 x86_64 x86_64 GNU/Linux [bk@rhel ~]$ passwd Changing password for user bk. [bk@rhel ~]$ touch myfile.txt [bk@rhel ~]$ date Mon May 31 08:22:48 IST 2021 [bk@rhel ~]$ last bk pts/2 192.168.244.1 Mon May 31 06:24 still logged in bk pts/1 192.168.244.1 Sun May 30 20:45 gone - no logout bk tty2 tty2 Sun May 30 20:26 gone - no logout