用户管理脚本之删除用户――Delete_user.sh

   该脚本非原创，仅发出来做学习参考交流。

   一个删除用户的脚本，思路清晰，构思慎密，考虑方方面面，是学习shell脚本方面的好例子。

1  #!/bin/bash
  2
  3  function get_answer {
  4  unset ANSWER
  5  ASK_COUNT=0
  6  while [ -z "$ANSWER" ]
  7  do
  8      ASK_COUNT=$[ $ASK_COUNT + 1 ]
  9      case $ASK_COUNT in
 10      2)
 11        echo
 12        echo "Please answer the question."
 13        echo
 14      ;;
 15      3)
 16        echo
 17        echo "One last try ... please answer the question."
 18        echo
 19      ;;
 20      4)
 21        echo
 22        echo "Since you refuse to answer the question..."
 23        echo "exiting program."
 24        echo
 25        #
 26        exit
 27      ;;
 28      esac
 29
 30      echo
 31     
 32      if [ -n "$LINE2" ]
 33      then
 34        echo $LINE1
 35        echo -e $LINE2" \c"
 36      else
 37        echo -e $LINE1" \c"
 38      fi
 39
 40      read -t 60 ANSWER
 41  done
 42  unset LINE1
 43  unset LINE2
 44  }
 45
 46  function process_answer {
 47  case $ANSWER in
 48  y|Y|yes|Yes|yEs|yeS|YEs|YES)
 49  ;;
 50  *)
 51     echo
 52     echo $EXIT_LINE1
 53     echo #EXIT_LINE2
 54     echo
 55     exit
 56  ;;
 57  esac
 58  unset EXIT_LINE1
 59  unset EXIT_LINE2
 60  }
 61
 62
 63  echo "Step #1 - Determine User Account name to Delete "
 64  echo
 65  LINE1="Please enter the username of the user"
 66  LINE2="account you wish to delete from system:"
 67  get_answer
 68  USER_ACCOUNT=$ANSWER
 69
 70  LINE1="IS $USER_ACCOUNT the user account"
 71  LINE2="you wish to delete from the system?[y|n]"
 72  get_answer
 73
 74  EXIT_LINE1="Because the account,$USER_ACCOUNT,is not"
 75  EXIT_LINE2="the one you wish to delete,we are leaving the script..."
 76  process_answer
 77
 78  USER_ACCOUNT_RECORD=$(cat /etc/passwd | grep -w $USER_ACCOUNT)
 79  if [ $? -eq 1 ]
 80  then
 81     echo
 82     echo "Account,$USER_ACCOUNT,not found."
 83     echo "Leaving the script..."
 84     echo
 85     exit
 86  fi
 87
 88  echo
 89  echo "I found this record:"
 90  echo $USER_ACCOUNT_RECORD
 91  echo
 92
 93  LINE1="Is this the correct User Account? [y|n]"
 94  get_answer
 95
 96  EXIT_LINE1="Because the account,$USER_ACCOUNT,is not"
 97  EXIT_LINE2="the one you wish to delete,we are leaving the script..."
 98  process_answer
 99
100  echo
101  echo "Step #2 - Find process on system belonging to user Account"
102  echo
103  echo "$USER_ACCOUNT has the following processes running:"
104  echo
105
106  ps -u $USER_ACCOUNT
107
108  case $? in
109  1)
110     echo "There are no processes for this account currently running."
111     echo
112  ;;
113  0)
114     unset ANSWER
115     LINE1="Would you like me to kill the process(es)?[y|n]"
116     get_answer
117
118     case $ANSWER in
119     y|Y|yes|Yes|yEs|yeS|YEs|YES)
120     echo
121     trap "rm $USER_ACCOUNT_Running_Process.rpt" SIGTERM SIGINT SIGQUIT
122     ps -u $USER_ACCOUNT > $USER_ACCOUNT_Running_Process.rpt
123     exec < $USER_ACCOUNT_Running_Process.rpt
124     read USER_PROCESS_REC
125     read USER_PROCESS_REC
126     while [ $? -eq 0 ]
127        do
128        USER_PID=$(echo $USER_PROCESS_REC | cut -d " " -f1)
129        kill -9 $USER_PID
130        echo "Killed process $USER_PID"
131        read USER_PROCESS_REC
132        done
133
134        echo
135        rm $USER_ACCOUNT_Running_Process.rpt
136     ;;
137     *)
138        echo
139        echo "Will not kill the process(es)"
140        echo
141     ;;
142     esac
143  ;;
144  esac
145
146
147  echo
148  echo "Step #3 - Find files on system belonging to user account"
149  echo
150  echo "Creating a report of all files owned by $USER_ACCOUNT."
151  echo
152  echo "It is recommended that you backup/archive these files."
153  echo "and then do one of two things:"
154  echo "   1) Delete the files"
155  echo "   2) Change the files' ownership to a current user account."
156  echo
157  echo "Please wait. This may take a while..."
158
159
160  REPORT_DATE=`date +%y%m%d`
161  REPORT_FILE=$USER_ACCOUNT"_Files_"$REPORT_DATE.rpt
162
163  find / -user $USER_ACCOUNT > $REPORT_FILE 2> /dev/null
164
165  echo
166  echo "Report is complete."
167  echo "Name of report:      $REPORT_FILE"
168  echo "Location of report:      `pwd`"
169  echo
170
171  echo
172  echo "Step #4 - Remove user account"
173  echo
174
175  LINE1="Do you wish to remove $User_Account's account from system?[y|n]"
176  get_answer
177
178
179  EXIT_LINE1="Since you do not wish to remove the user account."
180  EXIT_LINE2="$USER_ACCOUNT at this time.exiting the script..."
181  process_answer
182
183  userdel $USER_ACCOUNT
184  echo
185  echo "User account,$USER_ACCOUNT,has been removed."
186  echo