UNIX COMMAND

1. Find the current time and date.

[cs@localhost~]$ date

Thu Aug 23 09:54:15 EDT 2018

[cs@localhost ~]$

2. Create a blank file.

[cs@localhost ~]$ touch dip.txt

[cs@localhost ~]$

3. Create a file and write some sentences in the file.

[cs@localhost~]$ cat>find1.txt

today is thursday

i am a student

bhairabganguly college

[cs@localhost ~]$

4 . Display the content of the file find1.txt.

[cs@localhost~]$ cat find1.txt

today is thursday

i am a student

bhairabganguly college

[cs@localhost ~]$

5. Append some line in atext file.

[cs@localhost~]$ cat>>find1.txt

Tomorrow  isfriday

[cs@localhost ~]$

6. Create a directory.

[cs@localhost~]$mkdir dip

[cs@localhost ~]$

7. Display all files and directories under current date.

[cs@localhost~]$dir

13.sh  assignment100.sh~  Downloads rina

13.sh~  assignment1.sh     exam     source

1.sh  assignment1.sh~    f1     source.txt

1.sh~  assignment1.txt    f3.txt     source.txt~

2.sh  assignment1.txt~   file.sh     student.txt

2.sh~  assignment2.sh     file.sh~ sudip\ 246

3.sh  assignment2.sh~    find1.txt sudip\ 2461

3.sh~  assignment2.txt    Music suvo\ saha

4.sh  assignment2.txt~   Pictures     tanima.txt~

4.sh~  assignment3.sh~    Public     Templates

5934.sh  Desktop     purbasha.sh     unix.txt

5.sh  destination.txt    purbasha.sh~ unix.txt~

5.sh~  dip purbasha.sp     Untitled\ Document

a  dip.txt     question6.sh    Untitled\ Document~

aritra  dip.txt~     question6.txt   Untitled\ Document\ 2

assignment100.sh  Documents     question6.txt~  Videos

[cs@localhost ~]$

8. Display all files and directories under current date.

[cs@localhost~]$ ls

13.sh             assignment100.sh~ Downloadsrina

13.sh~            assignment1.sh exam            source

1.sh              assignment1.sh~ f1              source.txt

1.sh~             assignment1.txt f3.txt          source.txt~

2.sh              assignment1.txt~ file.sh         student.txt

2.sh~             assignment2.sh file.sh~        sudip 246

3.sh              assignment2.sh~ find1.txt       sudip 2461

3.sh~             assignment2.txt Music           suvosaha

4.sh              assignment2.txt~ Pictures        tanima.txt~

4.sh~             assignment3.sh~ Public          Templates

5934.sh           Desktop purbasha.sh     unix.txt

5.sh              destination.txt purbasha.sh~    unix.txt~

5.sh~             dip purbasha.sp     Untitled Document

a                 dip.txt question6.sh    Untitled Document~

aritra            dip.txt~ question6.txt   Untitled Document 2

assignment100.sh  Documents question6.txt~  Videos

[cs@localhost ~]$

9. Details of all processes which are currently executing.

[cs@localhost~]$ps

 PID TTY          TIME CMD

1317 pts/0    00:00:00 bash

16042 pts/0    00:00:00 ps

[cs@localhost~]$

Date: 28.08.2018

10. Count the total number of lines, words, characters of a file f3.

[cs@localhost~]$ cat>f3.txt

i am a student.

today is tuesday.

bhairabganguly college.

[cs@localhost~]$wc f3.txt

3 10 59 f3.txt

[cs@localhost ~]$

11. Count the total number of lines, words, characters of file f3.txt and f4.txt.

[cs@localhost~]$ cat>f3.txt

i am a student.

today is tuesday.

bhairabganguly college.

[cs@localhost~]$ cat>f4.txt

i am a student.

bhairabganguly college.

[cs@localhost~]$wc f3.txt f4.txt

3  10 59 f3.txt

 2  7 41 f4.txt

5  17 100 total

[cs@localhost ~]$

12. Count the total number of characters of a file f3.

[cs@localhost~]$wc -c f3.txt

59 f3.txt

[cs@localhost ~]$

13. Count the total number of characters of file f3.txt f4.txt.

[cs@localhost~]$ cat>f3.txt

i am a student.

today is tuesday.

bhairabganguly college.

[cs@localhost~]$ cat>f4.txt

i am a student.

bhairabganguly college.

[cs@localhost~]$wc -c f3.txt f4.txt

59 f3.txt

41 f4.txt

100 total

[cs@localhost ~]$

14. Count the total number of words of a file f3.txt.

[cs@localhost~]$ cat>f3.txt

i am a student.

today is tuesday.

bhairabganguly college.

[cs@localhost~]$wc -w f3.txt

10 f3.txt

[cs@localhost ~]$

15. Count the total no of words of file f3.txt f4.txt.

[cs@localhost~]$ cat>f3.txt

i am a student.

today is tuesday.

bhairabganguly college.

[cs@localhost~]$ cat>f4.txt

i am a student.

bhairabganguly college.

[cs@localhost~]$wc -w f3.txt f4.txt

10 f3.txt

 7 f4.txt

17 total

[cs@localhost ~]$

16. Count the total number of lines of a file f3.txt.

[cs@localhost~]$ cat>f3.txt

i am a student.

today is tuesday.

bhairabganguly college.

[cs@localhost~]$wc -l f3.txt

3 f3.txt

[cs@localhost ~]$

17. Count the total number of lines of file f3.txt and f4.txt.

[cs@localhost~]$ cat>f3.txt

i am a student.

today is tuesday.

bhairabganguly college.

[cs@localhost~]$ cat>f4.txt

i am a student.

bhairabganguly college.

[cs@localhost~]$wc -l f3.txt f4.txt

 3 f3.txt

 2 f4.txt

 5 total

[cs@localhost ~]$

18.Create  folder and file mentioned in the tree. [cs@localhost~]$ cat>f1.txt

i am a student.

today is tuesday.

bhairabganguly college.

[cs@localhost~]$ cat>f2.txt

iam a student.

today is tuesday.

bhairabgangulycolege.

[cs@localhost~]$wc f2.txt

3  9 57 f2.txt

[cs@localhost~]$ cat>f3.txt

i am a student.

today is tuesday.

bhairabganguly college.

[cs@localhost~]$wc f3.txt

3 10 59 f3.txt

[cs@localhost~]$ cat>f4.txt

i am a student.

bhairabganguly college.

[cs@localhost~]$wc f3.txt f4.txt

3  10 59 f3.txt

 2  7 41 f4.txt

5  17 100 total

[cs@localhost~]$wc -c f3.txt

59 f3.txt

[cs@localhost~]$wc -c f3.txt f4.txt

59 f3.txt

41 f4.txt

100 total

[cs@localhost~]$wc -w f3.txt

10 f3.txt

[cs@localhost~]$wc -w f3.txt f4.txt

10 f3.txt

 7 f4.txt

17 total

[cs@localhost~]$wc -l f3.txt

3 f3.txt

[cs@localhost~]$wc -l f3.txt f4.txt

 3 f3.txt

 2 f4.txt

 5 total

[cs@localhost~]$mkdir Day

[cs@localhost~]$ cd Day

[cs@localhostDay]$mkdirsunday

[cs@localhostDay]$mkdirmonday

[cs@localhostDay]$mkdirfriday

[cs@localhostDay]$ cd sunday

[cs@localhostsunday]$mkdir 1

[cs@localhostsunday]$mkdir 2

[cs@localhostsunday]$ cd ..

[cs@localhostDay]$ cd monday

[cs@localhostmonday]$mkdir 1

[cs@localhostmonday]$mkdir 2

[cs@localhostmonday]$mkdir 3

[cs@localhostmonday]$ cd ..

[cs@localhostDay]$ cd friday

[cs@localhostfriday]$mkdir 1

[cs@localhostfriday]$mkdir 2

[cs@localhostfriday]$mkdir 3

[cs@localhostfriday]$mkdir 4

[cs@localhostfriday]$ cd ..

[cs@localhostDay]$ cd sunday

[cs@localhostsunday]$ cd 1

[cs@localhost 1]$ touch f1.txt

[cs@localhost 1]$ touch f2.txt

[cs@localhost1]$ cd ..

[cs@localhostsunday]$ cd 2

[cs@localhost 2]$ touch f1.txt

[cs@localhost 2]$ touch f2.txt

[cs@localhost2]$ cd ..

[cs@localhostsunday]$ cd ..

[cs@localhostDay]$ cd monday

[cs@localhostmonday]$ cd 1

[cs@localhost 1]$ touch f1.txt

[cs@localhost 1]$ touch f2.txt

[cs@localhost1]$ cd ..

[cs@localhostmonday]$ cd 2

[cs@localhost 2]$ touch f1.txt

[cs@localhost 2]$ touch f2.txt

[cs@localhost2]$ cd ..

[cs@localhostmonday]$ cd 3

[cs@localhost 3]$ touch f1.txt

[cs@localhost 3]$ touch f2.txt

[cs@localhost3]$ cd ..

[cs@localhostmonday]$ cd ..

[cs@localhostDay]$ cd friday

[cs@localhostfriday]$ cd 1

[cs@localhost 1]$ touch f1.txt

[cs@localhost 1]$ touch f2.txt

[cs@localhost1]$ cd ..

[cs@localhostfriday]$ cd 2

[cs@localhost 2]$ touch f1.txt

[cs@localhost 2]$ touch f2.txt

[cs@localhost2]$ cd ..

[cs@localhostfriday]$ cd 3

[cs@localhost 3]$ touch f1.txt

[cs@localhost 3]$ touch f2.txt

[cs@localhost3]$ cd ..

[cs@localhostfriday]$ cd 4

[cs@localhost 4]$ touch f1.txt

[cs@localhost 4]$ touch f2.txt

[cs@localhost4]$ cd ..

[cs@localhostfriday]$ cd ..

[cs@localhostDay]$ cd ..

[cs@localhost ~]$

19. Delete a file.

[cs@localhost1]$ ls

f1.txt  f2.txt

[cs@localhost1]$ rm f1.txt

[cs@localhost1]$ ls

f2.txt

[cs@localhost 1]$

20. Copy a file.

[cs@localhost1]$ ls

f2.txt

[cs@localhost1]$ cp f2.txt f3.txt

[cs@localhost1]$ ls

f2.txt  f3.txt

[cs@localhost 1]$

21. Move a file.

[cs@localhost1]$ ls

f2.txt  f3.txt

[cs@localhost1]$ mv f3.txt f4.txt

[cs@localhost1]$ ls

f2.txt  f4.txt

[cs@localhost 1]$

                                                                 Date: 29.08.2018

22. Show the lines in which the word "student" is present.

[bgc@localhost ~]$ cat>file2.txt

I am a student

You are not a student

Today is wednesday

Student life is the best life

[bgc@localhost ~]$ grep "student" file2.txt

I am a student

You are not a student

[bgc@localhost ~]$

23. Show the lines and line no. in which the word "student" is present.

[bgc@localhost ~]$ cat>file2.txt

I am a student

You are not a student

Today is wednesday

Student life is the best life

[bgc@localhost ~]$ grep -n "student" file2.txt

1:I am a student

2:You are not a student

[bgc@localhost ~]$

24. Show the lines in which the word "student" is present ignoring case-sensitive.

[bgc@localhost ~]$ cat>file2.txt

I am a student

You are not a student

Today is wednesday

Student life is the best life

[bgc@localhost ~]$ grep -i "student" file2.txt

I am a student

You are not a student

Student life is the best life

[bgc@localhost ~]$

25. Show the lines and line no. in which the word "student" is present ignoring case-sensitive.

[bgc@localhost ~]$ cat>file2.txt

I am a student

You are not a student

Today is wednesday

Student life is the best life

[bgc@localhost ~]$ grep -ni "student" file2.txt

1:I am a student

2:You are not a student

4:Student life is the best life

[bgc@localhost ~]$

26. Show the total no. of lines in which the word "student" is present.

[bgc@localhost ~]$ cat>file2.txt

I am a student

You are not a student

Today is wednesday

Student life is the best life

[bgc@localhost ~]$ grep -c "student" file2.txt

2

[bgc@localhost ~]$

27. Show the total no. of lines in which the word "student" is present ignoring case-sensitive.

[bgc@localhost ~]$ cat>file2.txt

I am a student

You are not a student

Today is wednesday

Student life is the best life

[bgc@localhost ~]$ grep -nci "student" file2.txt

3

[bgc@localhost ~]$

28. Show the lines in which the word "student" is not present.

[bgc@localhost ~]$ cat>file2.txt

I am a student

You are not a student

Today is wednesday

Student life is the best life

[bgc@localhost ~]$ grep -v "student" file2.txt

Today is wednesday

Student life is the best life

[bgc@localhost ~]$

29. Show the lines in which the word "student" is not present ignoring case-sensitive.

[bgc@localhost ~]$ cat>file2.txt

I am a student

You are not a student

Today is wednesday

Student life is the best life

[bgc@localhost ~]$ -vi "student" file2.txt

bash: -vi: command not found...

[bgc@localhost ~]$

30. Show the lines and line no. in which the word "student" is not present ignoring case-sensitive.

[bgc@localhost ~]$ cat>file2.txt

I am a student

You are not a student

Today is wednesday

Student life is the best life

[bgc@localhost ~]$ grep -nvi "student" file2.txt

3:Today is wednesday

[bgc@localhost ~]$