delete

linux C 写的图书馆学生登入界面源码

#! /bin/sh -
record_file=passwd
clear
echo "             删除用户记录 "
while true
do

echo " "
echo  "输入用户ID: "
  read uid


if
(test -z $uid)
then
echo  " 没有键入ID,请再次输入"
                                                                                
continue
elif(
         echo $uid>temp
         grep -q "[^0-9]" temp
)
then
     echo "无效ID"
elif
(  test "$uid" -lt "500")               #判空方法2 "$uid" = " "
then
    echo "用户ID需要大于500,请再次输入"
continue
                                                                                
elif
# ( cut -f 3 -d ':' $record_file|grep -wq $uid
(awk -F : ' {print $3} ' $record_file|grep -wq $uid)
then
awk -F : ' $3 == '$uid' ' $record_file

break

else
echo "此用户名不存在"
continue
fi
done




while true
do
echo "确认删除?(Y或N)"

read answer1
case $answer1 in

y) awk -F : ' $3 == "$uid" ' $record_file|grep -v $uid $record_file >temp
mv -f temp $record_file

#userdel -r 
echo "记录已删除"
break;;
 Y) awk -F : ' $3 == "$uid" ' $record_file|grep -v $uid $record_file >temp
mv -f temp $record_file
echo "记录已删除"
break;;
 n)sh menu ;;
 N)sh menu ;;

 *)echo "错误,请输入Y或N"
continue ;;
esac

done

while true
do
echo "再删除一个么?(Y或N)"
read answer2
case $answer2 in
y)sh delete;;
Y)sh delete;;
n)sh menu;;
N)sh menu;;
*)echo "错误,请输入Y或N"
 continue
esac
done