管理用户（删除指定用户）shell脚本实现

系统中删除一个用户，要慎之又慎。编写一个shell脚本交互式实现用户删除。代码逻辑：
1、获取正确用户名
2、创建函数获取正确的用户名
3、验证获取的用户名
4、确认获取的用户是否存在
5、删除属于用户的进程
6、查找属于用户的文件并输出文件报告便于后续删除
7、删除用户
shell脚本如下：

#!/bin/bash 
# 
#Delete_User - Automates the 4 steps to remove an account 
# 
############################################################### 
# Define Functions 
# 
##################################################### 
function get_answer { 
# 
unset ANSWER 
ASK_COUNT=0 
# 
while [ -z "$ANSWER" ] #While no answer is given, keep asking. 
do ASK_COUNT=$[ $ASK_COUNT + 1 ] 
# case $ASK_COUNT in #If user gives no answer in time allotted 2) echo echo "Please answer the question." echo ;; 3) echo echo "One last try...please answer the question." echo ;; 4) echo echo "Since you refuse to answer the question..." echo "exiting program." echo # exit ;; esac 
# echo 
# if [ -n "$LINE2" ] then #Print 2 lines echo $LINE1 echo -e $LINE2" \c" else #Print 1 line echo -e $LINE1" \c" fi
# 
# Allow 60 seconds to answer before time-out read -t 60 ANSWER 
done 
# Do a little variable clean-up 
unset LINE1 
unset LINE2 
# 
} #End of get_answer function 
# 
##################################################### 
function process_answer { 
# 
case $ANSWER in 
y|Y|YES|yes|Yes|yEs|yeS|YEs|yES ) 
# If user answers "yes", do nothing. 
;; 
*) 
# If user answers anything but "yes", exit script echo echo $EXIT_LINE1 echo $EXIT_LINE2 echo exit 
;; 
esac 
# 
# Do a little variable clean-up 
# 
unset EXIT_LINE1 
unset EXIT_LINE2 
# 
} #End of process_answer function 
# 
############################################## 
# End of Function Definitions 
# 
############# Main Script #################### 
# Get name of User Account to check 
# 
echo "Step #1 - Determine User Account name to Delete " 
echo 
LINE1="Please enter the username of the user " 
LINE2="account you wish to delete from system:" 
get_answer 
USER_ACCOUNT=$ANSWER 
# 
# Double check with script user that this is the correct User Account 
# 
LINE1="Is $USER_ACCOUNT the user account " 
LINE2="you wish to delete from the system? [y/n]" 
get_answer 
# 
# Call process_answer funtion:
# if user answers anything but "yes", exit script 
# 
EXIT_LINE1="Because the account, $USER_ACCOUNT, is not " 
EXIT_LINE2="the one you wish to delete, we are leaving the script..." 
process_answer 
# 
################################################################ 
# Check that USER_ACCOUNT is really an account on the system 
# 
USER_ACCOUNT_RECORD=$(cat /etc/passwd | grep -w $USER_ACCOUNT) 
# 
if [ $? -eq 1 ] # If the account is not found, exit script 
then echo echo "Account, $USER_ACCOUNT, not found. " echo "Leaving the script..." echo exit 
fi 
# 
echo 
echo "I found this record:" 
echo $USER_ACCOUNT_RECORD 
# 
LINE1="Is this the correct User Account? [y/n]" 
get_answer 
# 
# 
# Call process_answer function: 
# if user answers anything but "yes", exit script 
# 
EXIT_LINE1="Because the account, $USER_ACCOUNT, is not " 
EXIT_LINE2="the one you wish to delete, we are leaving the script..." 
process_answer 
# 
################################################################## 
# Search for any running processes that belong to the User Account 
# 
echo 
echo "Step #2 - Find process on system belonging to user account" 
echo 
# 
ps -u $USER_ACCOUNT >/dev/null #Are user processes running? 
# 
case $? in 
1) # No processes running for this User Account # echo "There are no processes for this account currently running." echo 
;; 
0) # Processes running for this User Account. # Ask Script User if wants us to kill the processes. # echo "$USER_ACCOUNT has the following processes running: "echo ps -u $USER_ACCOUNT # LINE1="Would you like me to kill the process(es)? [y/n]" get_answer # case $ANSWER in y|Y|YES|yes|Yes|yEs|yeS|YEs|yES ) # If user answers "yes", # kill User Account processes. # echo echo "Killing off process(es)..." # # List user processes running code in variable, COMMAND_1 COMMAND_1="ps -u $USER_ACCOUNT --no-heading" # # Create command to kill proccess in variable, COMMAND_3 COMMAND_3="xargs -d \\n /usr/bin/sudo /bin/kill -9" # # Kill processes via piping commands together $COMMAND_1 | gawk '{print $1}' | $COMMAND_3 # echo echo "Process(es) killed." ;; *) # If user answers anything but "yes", do not kill. echo echo "Will not kill the process(es)" echo ;; esac 
;; 
esac 
################################################################# 
# Create a report of all files owned by User Account 
# 
echo 
echo "Step #3 - Find files on system belonging to user account" 
echo 
echo "Creating a report of all files owned by $USER_ACCOUNT." 
echo 
echo "It is recommended that you backup/archive these files," 
echo "and then do one of two things:" 
echo " 1) Delete the files" 
echo " 2) Change the files' ownership to a current user account." 
echo 
echo "Please wait. This may take a while..." 
# 
REPORT_DATE=$(date +%y%m%d) 
REPORT_FILE=$USER_ACCOUNT"_Files_"$REPORT_DATE".rpt" 
# 
find / -user $USER_ACCOUNT > $REPORT_FILE 2>/dev/null 
# 
echo
echo "Report is complete." 
echo "Name of report: $REPORT_FILE" 
echo "Location of report: $(pwd)" 
echo 
#################################### 
# Remove User Account 
echo 
echo "Step #4 - Remove user account" 
echo 
# 
LINE1="Remove $USER_ACCOUNT's account from system? [y/n]" 
get_answer 
# 
# Call process_answer function: 
# if user answers anything but "yes", exit script 
# 
EXIT_LINE1="Since you do not wish to remove the user account," 
EXIT_LINE2="$USER_ACCOUNT at this time, exiting the script..." 
process_answer 
# 
userdel $USER_ACCOUNT #delete user account 
echo 
echo "User account, $USER_ACCOUNT, has been removed" 
echo 
# 
exit