How to Check File Permissions for a Specific User in Linux

To check file permissions for a specific user in Linux, you can use the ls command with the -l option followed by the file name.

For example, to check the file permissions for user 'john' on a file called 'example.txt', you would run the following command:

ls -l example.txt

This will output a list of file permissions in the following format:

-rw-r--r-- 1 owner group size date time filename

The first three characters indicate the permissions for the file owner, the second three characters indicate the permissions for the group, and the last three characters indicate the permissions for everyone else.

To check if a specific user has permission to read, write, or execute the file, you can look at the appropriate character in the permissions string.

For example, if the permissions string for a file is -rw-r--r--, this means that the owner has read and write permission, the group has read permission, and everyone else has read permission.

To check if user 'john' has read permission, you would look at the second character in the permissions string, which is 'r' in this case. If the user has write permission, you would look at the third character, and if the user has execute permission, you would look at the fourth character.