r – 4, w – 2, x – 1
_rw_ r_ _ r_ _ (644) Default file permission
drwx r_x r_x (755) Default directory permission
O G O - Permission categories
# ls –n /var/adm
drwxrwxr_x 5 4 4 512 nov 15 14:55 file1
5 - No of hard link to the file or directory
4 – The UID of the owner
4 – The GID of the group
512 – Size
# Chmod –R 755
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