5-Manipulating File Permissions
- Recap
    - 1 owner
    - 1 Group
    - r=read
    - w=write
    - x=execute
    - -rwxrwxrwx
    - applied to First Permissions
        - 1. Owner
        - 2. Group
        - 3. Everyone
- **********WARNING**********
    - Do not mess with File Permissions Unnecessarily
    - Do not mess with System Files and Supplied Directories
        -  ~ , ~/Documents, /System, etc
- 3 Commands
    - chown username file(s)
        - changes the owner of the file
        - Only 1 Flag: -R
            - applies changes recursively, down into the filesystem
            - chown -R username file(s)
    - chgrp group file(s)
        - Only 1 Flag: -R
            - applies changes recursively, down into the filesystem
            - chgrp -R username file(s)
    - Put the two together:
        - chown username:group file(s)
    - chmod
        - OLD Command
            - background
                - permissions are 3 bit binary #s
                    - rwx=111
                    - r-x=101
                    - etc
                - to use this command, a number is necessary to show
                  which permissions to set
                    - to find it, use this trick:
                        - always say rwx in that order
                        - r=4
                        - w=2
                        - x=1
                        - rwx=4+2+1=7
                        - r-x=4+1=5
                        - rw-=4+2=6
                        - r--=4=4
                    - Put them in rwx order:
                    - rwxrwxrwx=777
                    - rwxr-xr-x=755
                        - most common
                    - rw-r--r--=644
                    - rwx------=700
    - chmod the 3 # sequence file(s)
        - Only 1 Flag: -R
            - applies changes recursively, down into the filesystem
            - chmod -R the 3# sequence file(s)
        - example
            - chmod 755 ~/Documents/myfile
        - check to make sure you did it right, do ls -l
        - Bart Busschots
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