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Enter a three-digit code to see the effect on the permissions.
chmod testfile -rw-r--r-- testfile
Enter a combination of r, w, x, and - to see the corresponding numeric code.
- --- --x -w- -wx r-- r-x rw- rwx --- --x -w- -wx r-- r-x rw- rwx --- --x -w- -wx r-- r-x rw- rwx testfile
chmod 000 testfile
chmod