This week, we learned a little more about the UNIX file system. The file system is similar to that of any other major operating system. There are some exceptions however. For instance, instead of having multiple drives (ie. C:\, D:\), everything is located under the root directory (/) as seen below. All other devices (disk drive, etc.) are located under /dev.
One very important command to keep in mind is chmod or change mode. This command allows you to change the permissions of files and directories. I decided to do a little more exploring of the command. While searching, I came across a list of common chmod combinations (below) here.
Command |
Purpose |
| chmod 400 file | To protect a file against accidental overwriting. |
| chmod 500 directory | To protect yourself from accidentally removing, renaming or moving files from this directory. |
| chmod 600 file | A private file only changeable by the user who entered this command. |
| chmod 644 file | A publicly readable file that can only be changed by the issuing user. |
| chmod 660 file | Users belonging to your group can change this files, others don’t have any access to it at all. |
| chmod 700 file | Protects a file against any access from other users, while the issuing user still has full access. |
| chmod 755 directory | For files that should be readable and executable by others, but only changeable by the issuing user. |
| chmod 775 file | Standard file sharing mode for a group. |
| chmod 777 file | Everybody can do everything to this file. |
| chmod +x file | Enables only the file execution. |