Linux Basic Five

1. File operation     stat  display file or file system status         touch         access time         modify time        change time         -C: Do not create empty file         -a: Modify access time only          -m: Modify only modified time         -T:STAMP [CC] Yymmddhhmm.ss           2. User and Rights Management       User: Resource allocation, one of the core elements of the security permissions model      password: User authentication          Create user         ueradd  adduser             -u  uid: Specify uid             -g &nbsp GID: Specify user base Group ID, group must already exist             -G   GID: Specify user extra group, group must already exist             -d     &NBSP: Specifies the user directory, which does not exist in advance             -c    " ": Specify comment information             -s     &NBSP: Specifies the default shell (with path), specifying the use of shell         that appears in the/etc/shells file     -M    &NBSP: When creating a user, force the home directory to be created              -M    &NBSP: When creating a user, the home directory is not created              -D    &NBSP: Create a new default value for the user

Linux Basic Five