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Linux Materials-Free Download

UNIX COMMANDS

1) To Display the Date:

[mca0610015@linux ~]$ date

Tue Jan 8 15:20:42 IST 2008

2) To Display the Time:

[mca0610015@linux ~]$ time

real 0m0.000s

user 0m0.001s

sys 0m0.000s

[mca0610015@linux ~]$

3)To Display the calendar:

[mca0610015@linux ~]$ cal

January 2008

Su Mo Tu We Th Fr Sa

1 2 3 4 5

6 7 8 9 10 11 12

13 14 15 16 17 18 19

20 21 22 23 24 25 26

27 28 29 30 31

4) To clear the screen: 

[mca0610015@linux ~]$clear 

5) To Create a new directory:

[mca0610015@linux sample]$ mkdir first

[mca0610015@linux sample]$

6) To check how many users activated currently:

[mca0610015@linux nana]$ who

mca06100 pts/1 Jan 8 15:21 (192.169.3.20)

mca06100 pts/2 Jan 8 15:17 (192.169.3.10)

mca06100 pts/3 Jan 8 15:27 (192.169.3.33)

mca06100 pts/4 Jan 8 15:18 (192.169.3.36)

mca06100 pts/5 Jan 8 15:18 (192.169.3.18)

mca06100 pts/6 Jan 8 15:19 (192.169.3.43)

7) To Display the current Login:

[mca0610015@linux nana]$ who am i

mca06100 pts/24 Jan 8 15:24 (192.169.3.44)

[mca0610015@linux nana]$ 

8) To Change the Directory: 

[mca0610015@linux ~]$ cd sample

[mca0610015@linux sample]$

9) To Exit to previous directory:

[mca0610015@linux sample]$ cd ..

[mca0610015@linux ~]$

10) To Create a new File:

[mca0610015@linux ~]$ cat > vel

hi i am velmurugan

[mca0610015@linux ~]$

11) Display the content of File:

[mca0610015@linux ~]$ cat vel

hi i am velmurugan

[mca0610015@linux ~]$

12) To Display the Present working directory:

[mca0610015@linux sample]$ pwd

/home/mca0610015/sample

[mca0610015@linux sample]$

13) To Display the Long form of information of files: 

[mca0610015@linux ~]$ ls -l

total 32

drwxrwxr-x 2 mca0610015 mca0610015 4096 Jan 8 15:26 kgln

drwxrwxr-x 2 mca0610015 mca0610015 4096 Jan 8 15:29 nana

drwxrwxr-x 3 mca0610015 mca0610015 4096 Jan 8 15:40 sample

-rw-rw-r-- 1 mca0610015 mca0610015 19 Jan 8 15:47 vel

[mca0610015@linux ~]$ 

14) To Display the Hidden files 

[mca0610015@linux ~]$ ls -a

. .bash_history .bash_profile .emacs .kde nana vel .zshrc

.. .bash_logout .bashrc .gtkrc kgln sample .xemacs

[mca0610015@linux ~]$ 

15) To Copy the file in to another File 

[mca0610015@linux ~]$ cp press vel

[mca0610015@linux ~]$ cat vel

hi i am vel

[mca0610015@linux ~]$

16) To Display the Process State 

[mca0610015@linux ~]$ ps

PID TTY TIME CMD

9307 pts/24 00:00:00 bash

12257 pts/24 00:00:00 ps

[mca0610015@linux ~]$

17) To Remove the File:

Before Remove: 

[mca0610015@linux ~]$ ls -l

total 40

drwxrwxr-x 2 mca0610015 mca0610015 4096 Jan 8 15:26 kgln

drwxrwxr-x 2 mca0610015 mca0610015 4096 Jan 8 15:29 nana

-rw-rw-r-- 1 mca0610015 mca0610015 12 Jan 8 16:11 press

drwxrwxr-x 3 mca0610015 mca0610015 4096 Jan 8 16:05 sample

-rw-rw-r-- 1 mca0610015 mca0610015 12 Jan 8 16:11 vel

[mca0610015@linux ~]$ rm press 

After Remove:

[mca0610015@linux ~]$ ls -l

total 32

drwxrwxr-x 2 mca0610015 mca0610015 4096 Jan 8 15:26 kgln

drwxrwxr-x 2 mca0610015 mca0610015 4096 Jan 8 15:29 nana

drwxrwxr-x 3 mca0610015 mca0610015 4096 Jan 8 16:05 sample

-rw-rw-r-- 1 mca0610015 mca0610015 12 Jan 8 16:11 vel

[mca0610015@linux ~]$

18) To Remove the Directory: 

Before Remove: 

[mca0610015@linux ~]$ ls -l

total 32

drwxrwxr-x 2 mca0610015 mca0610015 4096 Jan 8 15:26 kgln

drwxrwxr-x 2 mca0610015 mca0610015 4096 Jan 8 15:29 nana

drwxrwxr-x 3 mca0610015 mca0610015 4096 Jan 8 16:05 sample

-rw-rw-r-- 1 mca0610015 mca0610015 12 Jan 8 16:11 vel

[mca0610015@linux ~]$ rmdir nana



After Remove: 

[mca0610015@linux ~]$ ls -l

total 24

drwxrwxr-x 2 mca0610015 mca0610015 4096 Jan 8 15:26 kgln

drwxrwxr-x 3 mca0610015 mca0610015 4096 Jan 8 16:05 sample

-rw-rw-r-- 1 mca0610015 mca0610015 12 Jan 8 16:11 vel

[mca0610015@linux ~]$ 

19) To Sort Ascending and descending order: 

[mca0610015@linux ~]$ cat > mani

vel

arun

sathish

press

manikandan

venki

bala

Ascending: 

nana[mca0610015@linux ~]$ sort mani

arun

bala

manikandan

nana

press

sathish

vel

venki

Desending: 

[mca0610015@linux ~]$ sort -r mani

venki

vel

sathish

press

nana

manikandan

bala

arun

[mca0610015@linux ~]$ To Execute the C program: 

[mca0610015@linux ~]$ cat sam

main()

{

printf("Welcome");

}

[mca0610015@linux ~]$ cc sam.c

sam.c:5:2: warning: no newline at end of file

[mca0610015@linux ~]$ ./a.out

Welcome[mca0610015@linux ~]$

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