Linux basic command–Discussion about text editor

You are most welcome to this post.

Really thanks to you for your interest in this topics. :)

Now in this post I’m going to discuss about the linux basic command which is shown using vi/vim editor of Linux.

Linux basic command–Discussion about text editor

Generally, windows has the editor named notepad or notepad++

In Linux the editor is marked as vi or vim.

 

Vi is old editor, it is also the black and white version and it remains default.

On the other hand, vim is nice, user friendly and it is also the advanced editor. But one thing that, the package need to be installed.

 

At first we’ve changed our directory to home.=>

 

[root@localhost ~]# cd /home

After that we’ve created a directory named “lnx” using mkdir command, as you know, mkdir command is used for making directories.

[root@localhost home]# mkdir lnx

After that we’ve changed our directories from “home” to “lnx”.

[root@localhost home]# cd lnx

Now we want to copy some content from one folder to our current directory. Here in this example, I “passwd” folder to the current directory, and my current directory is “lnx” folder. The passwd folder is located in  “/etc/passwd” . To copy content, i just have written a dot (.) at the end of the line. So the whole line indicates that copy the contents of passwd to the current directory.

[root@localhost lnx]# cp /etc/passwd .

Now lets see the folder passwd is copied or not.

[root@localhost lnx]# ls

passwd

Yes !! It is copied.

[root@localhost lnx]# vim file1

A writing space will open; write anything you want. For staring writing, just press “i”. To exit, from the writing, press “Shift+q” and then write exit.

Now we want to read the contents of a file. So we’ll use “cat” command.

[root@localhost lnx]# cat file1

See the output !! The contents are displayed.

Welcome to==>> whilenetworking.com

==>> myitzn.blogspot.com

 

 

Some important point you can remember:

 

[root@localhost lnx]# vim file1

This command helps us open our previous writing work.

Now you need to edit our work, so you can apply this:

>> dd which is for delete line by line.

>> ndd which is for delete n line(s)

>> dw — delete word.

>> d1 — delete letter.

>> Shift + d — cut lines from recent cursor position.

>> yy —copy one line.

>> nyy — copy n lines.

>> yw — copy word.

>> y1 — copy letter

>> 2y1 — copy 2 letter

>> p — paste

>> Shift + g — cursor move to last line

>> Ctrl + r — redo

>> u — undo

>> o — writing

 

Now lets have small discussion about touch command.

Logged in as super user

[ece@localhost Desktop]$ su –

Password:

Last login: Sat May 7 04:26:55 EDT 2016 on pts/2

Changed directory to home=>

[root@localhost ~]# cd /home

Create a new directory named “nayan”

[root@localhost home]# mkdir nayan

Entered the directory=>

[root@localhost home]# cd nayan

[root@localhost nayan]# ls

[root@localhost nayan]# ls -l

total 0

Create a txt file by using “touch”command=>

[root@localhost nayan]# touch c.txt

See the list and its permission system in detail=>

[root@localhost nayan]# ls -l

total 0

-rw-r–r– 1 root root 0 May 7 11:59 c.txt

Now going back to home directory=>

[root@localhost nayan]# cd ..

[root@localhost home]# cat nayan

cat: nayan: Is a directory

 

[root@localhost home]# echo hello

Hello

 

[root@localhost home]# echo hello>nayan

-bash: nayan: Is a directory

 

[root@localhost home]# cd nayan

Copy contents of ” /etc/passwd” to current directory=>

[root@localhost nayan]# cp /etc/passwd .

 

[root@localhost nayan]# ls -l

total 4

-rw-r–r– 1 root root   0 May 7 11:59 c.txt

-rw-r–r– 1 root root 3004 May 7 12:02 passwd

 

[root@localhost nayan]# cat passwd  ; Cat command

Now if you want to see the last 10 contents then can use the tail command=>

[root@localhost nayan]# tail passwd   ;

ece1:x:1004:1005::/home/ece1:/bin/bash

amin:x:1005:1006::/home/amin:/bin/bash

magun:x:1006:1007::/home/magun:/bin/bash

dep:x:1007:1009::/home/dep:/bin/bash

pri:x:1008:1010::/home/pri:/bin/bash

irin:x:1009:1011::/home/irin:/bin/bash

a1:x:1010:1013::/home/a1:/bin/bash

a2:x:1011:1014::/home/a2:/bin/bash

u1:x:1012:1016::/home/u1:/bin/bash

u2:x:1013:1017::/home/u2:/bin/bash

 

If you want to see the first 10 line of the contents, then can write the command =>

[root@localhost nayan]# head passwd

 

Last 5 line =>

[root@localhost nayan]# tail -n 5 passwd

irin:x:1009:1011::/home/irin:/bin/bash

a1:x:1010:1013::/home/a1:/bin/bash

a2:x:1011:1014::/home/a2:/bin/bash

u1:x:1012:1016::/home/u1:/bin/bash

u2:x:1013:1017::/home/u2:/bin/bash

 

Location of hosts=>

[root@localhost nayan]# locate hosts

/etc/ghostscript

/etc/hosts

/etc/hosts.allow

/etc/hosts.deny

/etc/X11/fontpath.d/default-ghostscript

/etc/avahi/hosts

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Want to see the jpeg files?? just use the command=>

[root@localhost nayan]# locate -i .jpg

 

Find SElinux=>

[root@localhost nayan]# find /etc -type d -name selinux

/etc/selinux

 

Find the files which is more than 10mb in size using this command =>

[root@localhost ~]# find / -size +10M

/boot/initramfs-0-rescue-72f2d99ea211413bbc082429b977c36b.img

/boot/initramfs-3.10.0-229.el7.x86_64kdump.img

/boot/initramfs-3.10.0-229.el7.x86_64.img

/boot/initramfs-3.10.0-327.10.1.el7.x86_64.img

/boot/initramfs-3.10.0-327.10.1.el7.x86_64kdump.img

/dev/shm/pulse-shm-1796088854

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Find files which is less than 10mb in size using this command =>

[root@localhost ~]# find / -size -10M   ; Size less than 10M

/proc/1421/task/2581/root

/proc/1421/task/2581/exe

/proc/1421/task/2581/mounts

/proc/1421/task/2581/mountinfo

/proc/1421/task/2581/clear_refs

/proc/1421/task/2581/smaps

/proc/1421/task/2581/pagemap

/proc/1421/task/2581/attr

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Hope that you’ve enjoyed.