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Linux Useful commands

Here are the list of some useful Linux commands that's used on a day-to-day work and are equally important for interview purposes. 

1. How to check memory usage
free -h

-h is to make the result readable by humans.

2. How to check disk usage
df -h






3. How to check CPU Usage
top





4. How to quickly find the process id of a program
pgrep <ProcessName>





5. How to find the Linux Kernal version
uname -r
amar@LPF22E8MA:~$ uname -r
4.4.0-19041-Microsoft

6. How to find the Operating System (OS) version
cat /etc/os-release
lsb_release -a

amar@LPF22E8MA:~$ cat /etc/os-release
NAME="Ubuntu"
VERSION="20.04 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal

amar@LPF22E8MA:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04 LTS
Release: 20.04
Codename: focal

6. Want to see weather forecast in the Shell
curl wttr.in/bengaluru












7. Get live memory usage stats in a human readable format
watch vmstat -sSM









8. How to encrypt a file using VI Editor
    vi -x test.txt

9. How to check whether computer is 32 bit or 64 bit
getconf LONG_BIT
amar@LPF22E8MA:~$ getconf LONG_BIT
64


10. How to limit the CPU Usage for a process
cpulimit -p <pid of the process> -l 25

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