How to Calculate Magic numbers for chmod in Linux? | RedHat Linux Chmod CMD | Helpful in Interview

#linux #linux_tutorial #chmod #read #write #executer
This video will show bit calculation also in such a way that . you will never forget the use of chmod in future.
chmod +rwx filename to add permissions
chmod -rwx directoryname to remove permissions.
chmod +x filename to allow executable permissions.
chmod -wx filename to take out write and executable permissions.

#owners : these permissions will only apply to owners and will not affect other groups.
#groups : you can assign a group of users specific permissions, which will only impact users within the group.
all users: these permissions will apply to all users, and as a result, they present the greatest security risk and should be assigned with caution.

chmod g+w filename
chmod g-wx filename
chmod o+w filename
chmod o-rwx foldername

You may need to know how to change permissions in numeric code in Linux, so to do this you use numbers instead of “r”, “w”, or “x”.
0 = No Permission
1 = Execute
2 = Write
4 = Read
Permission numbers are:
0 = ---
1 = --x
2 = w
3 = -wx
4 = r-
5 = r-x
6 = rw-
7 = rwx
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