Linux File persmissions

Below is a basic explination of how the file permissions work in a Linux system and how to alter them using chmod.

File Permissions

• output of ls -l shows file permissions and users with file info
• Groups  - USER , GROUP , EVERYONE
• Permissions - r = read (4 bit) , w = write(2 bit) , x = execute(1 bit) , all = 8 bit
• adding the values will produce appropriate number for rights given

Remeber all chmod commands require sudo privilages

• chmod 700 file1 - makes the file read write exec only for user
• chmod 744 file1 - makes the file rwx for user , and read for others
• chmod 644 file1 - user can rw and others only read
• chmod 755 file1 - user can rwx and others can rx
• chmod 755 dir - mostly used for directories , rwx[USER] | rx[Group] | rx[Every]