What do permission characters mean?

In Linux, file and directory permissions are represented by a series of characters that indicate the access rights for the owner, group, and others. Here’s what each character means:

1. File Type Character:

   • The first character indicates the type of the file:
     • -: Regular file
     • d: Directory
     • l: Symbolic link
     • c: Character device
     • b: Block device
     • s: Socket
     • p: Named pipe (FIFO)

2. Permission Characters:
   The next nine characters are grouped into three sets of three, representing permissions for the owner, group, and others:

   • Owner Permissions (first three characters):

     • r: Read permission (the owner can read the file)
     • w: Write permission (the owner can modify the file)
     • x: Execute permission (the owner can execute the file or access the directory)

   • Group Permissions (next three characters):

     • r: Read permission (group members can read the file)
     • w: Write permission (group members can modify the file)
     • x: Execute permission (group members can execute the file or access the directory)

   • Others Permissions (last three characters):

     • r: Read permission (others can read the file)
     • w: Write permission (others can modify the file)
     • x: Execute permission (others can execute the file or access the directory)

3. Example:
   For a file with permissions -rwxr-xr--, the breakdown is:

   • -: Regular file
   • rwx: Owner has read, write, and execute permissions
   • r-x: Group has read and execute permissions, but not write
   • r--: Others have read permission only

Understanding these permission characters helps you manage access rights effectively in a Linux environment.