Today I have practiced Linux Basic commands as follows:

1. locate
2. find
3. chmod
4. chown
5. grep
6. history
7. alias
8. sort
9. jobs
10. ping
11. wget
12. top
13. uname
14. zip
15. unzip
16. hostname
17. useradd
18. userdel
19. lscpu
20. free
21. umstat
22. id
23. getent
24. lsof
25. nslookup
26. netstat
27. sed
28. cut
29. htop

Description:

1. To locate a file and return the directory it present in

locate

• In case to display all files and the directory it present in

locate "*.txt"

1. To display all files in the directory

find .

• display in the previous direc

find ..

• display only direc

find . -type d

• display only files

find . -type f

• display files with a specific name

find . -type f -name "two"

• display files modifies specific time ago

find . -type f -mmin-20

• display files that are empty

find . -empty

• display files with read,write,execute

find . -perm 777

• find all text files and remove

find . -type f -name "*.txt" -exec rm -rf {} +

1. To control/modify file permissions

chmod u=rwx,g=rw,o=r  file.txt

• modifying with numbers, 4 for read, 2 for write, 1 for execute

chmod 777 file.txt

1. To change file owner

chown root file.txt

1. To search for a string in group of files

grep "kunal" names.txt

• search complete word

grep -w "kunal kush" names.txt

• search and display line number

grep -n "name" names.txt

• complete word which is case sensitive, line number in all files

grep -win "name" ./*.txt

1. To know the history of commands used

histroy

1. To replace one string with another

alias

1. To sort in a file

sort

1. To show running processes

jobs

1. To connect to server and receive packet

ping

1. To download

wget

1. To show running softwares

top

1. To display kernel name

uname

1. To create compressed file

zip

1. To unzip file

unzip

1. To obtain hostname and DNS info

hostname

1. To add user

useradd

1. To delete user

userdel

1. To show cpu details

lscpu

1. To show free memory check

free

1. To show virtual memory check

umstat

1. To see groups

id

1. To see user exit

getent

1. To list all open files

lsoff

1. To check IP of a domain

nsloopup

1. To see active ports

netstat

1. stream editor logs

sed

1. To cut out selected portions of each file of a line

cut

1. To show resource consumptions

htop

Conclusion: I have completed training on basic Linux commands on day 3 of learning devops course by kunal.

Source: Kunal YT