Question

How this command used for and provide examples for each one.

Commands:

1-file

2-find

3-pwd

4-ln

5-stat

6- cmp, comm, and diff

7-md5sum

8-du

9-gzip

10-gunzip

11-bzip2, and bunzip

12-cpio

13-tar

14-wc

15-vi editor

Answer 1

I have covered all the commands below with example and explanation of command.

1. file
It determines what is the type of the file is for example


2. find
This command is useful for finding the file amoung the hierarchy.


3. pwd
This command is used to know the current working directory.


4. ln
This command is used create the link between the files.


5. stat
stat command provides the details about the files like file ,size, access, blocks, etc.


6. cmp, comm and diff
cmp is compare , comm is common , diff is diffrance between two files.

7.md5sum
The md5sum verify data integrity using MD5

example
command: md5sum /home/krunal/test/test.cpp > checkmd5.md5

it will store MD5 checksum in test.cpp

command: md5sum -c checkmd5.md5
output: /home/krunal/test/test.cpp: OK
if you have changed the file then it will give output
output: /home/krunal/test/test.cpp: FAILED

8.du 
du command is used for knowing the file space usage in disk
9.gzip
It compress the file and create the file with extansion .gz and have the header of GNU zip header. 
10. gunzip
It expands the compressed file it accept the extensip of file like  .gz , -z, .Z, tar or .tgz.
11. bzip2, and bunzip
bzip is used to compress the files. It usage less storage but uses higher memory.
bunzip is used for de-compress file.
we can de-compress using the bzip also by providing the flag -d
 
12. cpio
cpio stands for copy in, copy out 
this is used to copy file from and into the archived files

13. tar 
tar command is used to create the archive files and extract the archive files.

14. wc
it is used to count the word in file
15. vi editor
its editor where we can edit the files 
vi editor looks like: