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

Comments

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How to see remote changes before doing Git Pull

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Amar Helloween

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