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https://github.com/arkasarkar19/linux_shell_implementation

Refer Readme.md
https://github.com/arkasarkar19/linux_shell_implementation

cat-command cd cd-command date-command history-command linux-shell ls-command mkdir-command operating-system operating-systems rm-command shell terminal

Last synced: 17 days ago
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Refer Readme.md

Host: GitHub
URL: https://github.com/arkasarkar19/linux_shell_implementation
Owner: ArkaSarkar19
Created: 2020-01-12T10:50:07.000Z (about 5 years ago)
Default Branch: master
Last Pushed: 2020-06-18T09:28:10.000Z (over 4 years ago)
Last Synced: 2024-11-18T04:45:07.986Z (3 months ago)
Topics: cat-command, cd, cd-command, date-command, history-command, linux-shell, ls-command, mkdir-command, operating-system, operating-systems, rm-command, shell, terminal
Language: C
Homepage:
Size: 66.4 KB
Stars: 1
Watchers: 1
Forks: 0
Open Issues: 0
Metadata Files:
- Readme: README.md
- Changelog: history.txt

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README

# Linux_Shell_Imlementation
I have implemented a linux bash shell. The code is in C.

#### >>>This is my shell, use at our own risk <<<

### COMMANDS HANDLED
* **cd**
* cd command changes your present working directory to the directory or path entered as an argument.
* Syntax : $ cd [directory_name / directory_path]
* Example :

* cd directory or cd dir1/dir2/dir3

myterminal@arka:~/home/arkasarkar/Desktop/CAOS $ cd try
myterminal@arka:~/home/arkasarkar/Desktop/CAOS/try $
myterminal@arka:~/home/arkasarkar $ cd Desktop/CAOS/try
myterminal@arka:~/home/arkasarkar/Desktop/CAOS/try $

* cd .. , changes to the parent directory of the current directory.

myterminal@arka:~/home/arkasarkar/Desktop/CAOS/try $ cd ..
myterminal@arka:~/home/arkasarkar/Desktop/CAOS $
* cd ~, changes to the home directory

myterminal@arka:~/home/arkasarkar/Desktop/CAOS/try $ cd ~
myterminal@arka:~/home/arkasarkar $

* cd , works just like cd ~ command

myterminal@arka:~/home/arkasarkar/Desktop/CAOS/try $ cd
myterminal@arka:~/home/arkasarkar $

* cd / , changes to the root directory

myterminal@arka:~/home/arkasarkar/Desktop $ cd /
myterminal@arka:~/ $
* **echo**
* echo command is used to display line of text/string that are passed as an argument.
* Syntax : echo [option] [text]
* Example:

* echo “[text]”

myterminal@arka:~/home/arkasarkar $ echo "hello"
hello
myterminal@arka:~/home/arkasarkar $Arka Sarkar
2018222
* echo -n [text] , -n omits a new trailing line after printing the text.

myterminal@arka:~/home/arkasarkar $ echo -n "hello"
hellomyterminal@arka:~/home/arkasarkar $

* echo * , displays all the files/folders

myterminal@arka:~/home/arkasarkar/Desktop/CAOS $ echo *
a.out cat.c date.c demo1.c history.txt ls.c makefile mkdir.c rm.c try
* **history**
* Displays all the commands previously executed.
* Syntax : history [option]
* Example:
* history

myterminal@arka:~/home/arkasarkar/Desktop/CAOS $ history
history
mkdir try try2 try3
mkdir t
ls
mkdir
ry
mkdir try
ls
ls
ls -l
ls -l -h -a
cd demo
ls
cd
ls
........ Cont..

* history - c
* clears the history.
* **pwd**
* Displays the present working directory
* Syntax : pwd
* Example :
* pwd

myterminal@arka:~/home/arkasarkar/Desktop/CAOS $ pwd
current working directory :- /home/arkasarkar/Desktop/CAOS
* **exit**
* Exits the terminal
* Syntax : exit
* Example:

myterminal@arka:~/home/arkasarkar/Desktop/CAOS $ exit
* **ls**
* Ls command displays all the files / folders in the present working directory
* Syntax : ls [option]
* Example:
* ls

myterminal@arka:~/home/arkasarkar/Desktop/CAOS $ ls
a.out cat.c date.c demo1.c history.txt ls.c makefile mkdir.c rm.c try

* ls -l , shows long format → all permisions, space , time modifed.

myterminal@arka:~/home/arkasarkar/Desktop/CAOS $ ls -l
total 60
-rwxr-xr-x 1 arkasarkar arkasarkar 17584 Sep 1 22:05 a.out
-rw-rw-r-- 1 arkasarkar arkasarkar 1281 Sep 1 13:39 cat.c
-rw-rw-r-- 1 arkasarkar arkasarkar 1142 Aug 30 16:08 date.c
-rw-rw-r-- 1 arkasarkar arkasarkar 4944 Sep 1 22:05 demo1.c
-rw-rw-r-- 1 arkasarkar arkasarkar 1039 Sep 1 22:18 history.txt
-rw-rw-r-- 1 arkasarkar arkasarkar 757 Aug 30 01:58 ls.c
-rw-r--r-- 1 arkasarkar arkasarkar
38 Aug 31 13:31 makefile
-rw-rw-r-- 1 arkasarkar arkasarkar 1420 Aug 30 02:02 mkdir.c
-rw-rw-r-- 1 arkasarkar arkasarkar 1144 Aug 30 16:03 rm.c
drwxr-xr-x 2 arkasarkar arkasarkar 4096 Sep 1 21:12 try

* ls -lh, formats into human readable form.

total 60K
-rwxr-xr-x 1 arkasarkar arkasarkar 18K Sep 1 22:05 a.out
-rw-rw-r-- 1 arkasarkar arkasarkar 1.3K Sep 1 13:39 cat.c
-rw-rw-r-- 1 arkasarkar arkasarkar 1.2K Aug 30 16:08 date.c
-rw-rw-r-- 1 arkasarkar arkasarkar 4.9K Sep 1 22:05 demo1.c
-rw-rw-r-- 1 arkasarkar arkasarkar 1.2K Sep 1 22:20 history.txt
-rw-rw-r-- 1 arkasarkar arkasarkar 757 Aug 30 01:58 ls.c
-rw-r--r-- 1 arkasarkar arkasarkar 38 Aug 31 13:31 makefile
-rw-rw-r-- 1 arkasarkar arkasarkar 1.4K Aug 30 02:02 mkdir.c
-rw-rw-r-- 1 arkasarkar arkasarkar 1.2K Aug 30 16:03 rm.c
drwxr-xr-x 2 arkasarkar arkasarkar 4.0K Sep 1 21:12 try
* **cat**
* Read content from a file and displays it.
* Syntax : cat [filename]
* Example :
* cat [filename]

myterminal@arka:~/home/arkasarkar/Desktop/CAOS $ cat del.txt
Hello
myterminal@arka:~/home/arkasarkar/Desktop/CAOS $
* **date**
* Displays current date
* Syntax : date [arg]
* Example:
* date

myterminal@arka:~/home/arkasarkar/Desktop/CAOS $ date
Sun Sep 1 22:31:43 IST 2019
* date -R

myterminal@arka:~/home/arkasarkar/Desktop/CAOS $ date -R
Sun, 01 Sep 2019 22:31:54 +0530
* **rm**
* rm removes files or directories entered by the user.
* Syntax : rm [option] [filename]
* Example:
* rm [filename]

myterminal@arka:~/home/arkasarkar/Desktop/CAOS $ rm del.txt
* rm -r [dir_name] , deletes a directory and its contents

myterminal@arka:~/home/arkasarkar/Desktop/CAOS $ rm -r del
* rm -f [filename] , forcefully deletes a file if write protected.

myterminal@arka:~/home/arkasarkar/Desktop/CAOS $ rm -f del.txt
* rm * , deletes all the files of the parent directory ( not the directories)

myterminal@arka:~/home/arkasarkar/Desktop/CAOS $ rm *
* rm -r * , empties the parent directory

myterminal@arka:~/home/arkasarkar/Desktop/CAOS $ rm -r *
* **mkdir**
* mkdir creates an empty directory in the present working directory
* Syntax : mkdir [dir_name]
* Example :
* mkdir [dir_name]

myterminal@arka:~/home/arkasarkar/Desktop/CAOS $ mkdir hello
myterminal@arka:~/home/arkasarkar/Desktop/CAOS $ ls
a.out date.c hello
ls.c
mkdir.c try
cat.c demo1.c history.txt makefile rm.c
* mkdir [dir1_name] [dir2_name]

myterminal@arka:~/home/arkasarkar/Desktop/CAOS $ mkdir hello hello2
myterminal@arka:~/home/arkasarkar/Desktop/CAOS $ ls
a.out date.c hello history.txt makefile rm.c
cat.c demo1.c hello2 ls.c
mkdir.c try

### COMPILE AND RUNNING
**demo1.c** is the main file. Compile it on the terminal using **gcc demo1.c -o main** and run the executable main as **./main** commands.