Shell script applies "six" simulation to add users and delete users
Practice script
#! / bin/sh
#
# determine whether the file exists
#
Path=/etc/user.conf
If [!-f "$Path"]; then
Touch $Path
Fi
Chmod 644$ Path
# determine whether there are parameters
If [2-ne $#]; then
Echo "USER: sh adduser {- add |-del | search} username"
Exit 1
Fi
Age=$1
User=$2
If [0-lt $(echo "$User" | grep-E "[^ a Mizz User 0-9 User _]" | wc-l)]; then
Echo "The age format is error"
Exit 2
Fi
# find out whether the user exists
FunCheckUser () {
Check=$ (grep-w "$User" $Path | wc-l)
If [$check-eq 0]; then
Return 0
Else
Return 1
Fi
}
# add user
FunAddUser () {
FunCheckUser
If [$?-eq 0]; then
Echo "$User" > > $Path
Else
Echo "The user is having"
Exit 3
Fi
}
FunDelUser () {
FunCheckUser
If [$?-eq 0]; then
Echo "The $User no having"
Else
Sed-ri / ^ $User$/d $Path
Echo "The $User del"
Fi
}
# search whether a user exists
FunSearch () {
FunCheckUser
If [$?-eq 0]; then
Echo "NO user match"
Else
Echo "$User is having"
Fi
}
Case $Age in
-add)
FunAddUser
-del)
FunDelUser
Search)
FunSearch
*)
Echo "USER: sh adduser {- add |-del | search} username"
Esac
Note: grep-w exact match
