
$ mkdir perm; cd perm; echo 'hi' > perm.txt
$ chmod o-rw perm
$ ls -l
...
drwxrwx--x cwpark cwpark 4096 2월 10 22:33 perm
...
$ su cwpark2
$ cd perm
$ ls -l
ls: cannot open directory '.': Permission denied
$ exit
$ chmod o+rw perm
$ su cwpark2
$ cd perm
$ ls -l
rwxrwx--x cwpark cwpark 4096 2월 10 22:33 perm.txt
$ exit
$ chmod -R o+rw perm
$ su cwpark2
$ cd perm
$ ls -l
rwxrwxrwx cwpark cwpark 4096 2월 10 22:33 perm.txt
$ exit