Explanation About Chmod in linux

chmod is the command and system call which is used to change the access permission of file system ( file and directory ).

*references  https://en.wikipedia.org/wiki/Chmod

 

basically chmod is used to give protection for user file system,

we can chose who can access this file system and who doesn't allowed to access file system.

Owner-Group-Other

ls -l

# this command is using to show all file system permission

# if file system is "directory" type

# drwxrwxrwx

# if file system is "file" type

# -rwxrwxrwx 

 

 

* d = Directory

* r = Read

* w = Write

* x = Execute

* -R = Rekursif / to change all file system inside Directory

How To Use chmod

chmod -R 000 <File-System-Name>

# First '0' is for "Owner"

# Second '0' is for "Group"

# Third '0' is for "Other"

Numerical Permissions

# 

1 is for " Execute "

2 is for " Write "

4 is for " Read "

< You can combination Numerical Permissions >

Example:

1 + 2 = 3 ( 3 is for " Execute and Write " )

1 + 4 = 5 ( 5 is for " Execute and Read " )

2 + 4 = 6 ( 6 is for " Write and Read " )

Example How To use chmod

chmod -R 700 <File-System-Name>

# what will we get is: only owner is can " Execute, Write, And Read "

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