1. [root@localhost ~]#
~ Representative home directory
If it is root, it is /root (the root directory under the root directory)
If it is user then /home/user
pwd can display the current location
# means administrator, $ means ordinary user
2. Command option parameters
3. ls shows what is in the current directory
-l
(Beginning - normal file, d directory file, l soft link file)
After removing the first digit, there are 9 digits behind, and each 3 digits represent the owner u, the group g he belongs to, the others o, and three permissions (r read w write x execute)
The last dot represents ACL permissions
1 represents the number of times it was cited
9116 represents the size of the file, but this is not humanized, use ls -lh (h represents human)
-d see the directory itself
-i View id number
