如果循环不能正常工作

Question

在我的脚本中，当第一次在 if 循环中执行时，我在第三次执行后无法正常执行时正确执行。如果有任何错误，我该怎么办啊...？请解决我的问题...？在脚本中，我将客户名称的值设为 ABC，然后我再次给了 ABC，它正确执行了 if 条件，但我第三次给了 ABC，因为它无法正常工作..！

#!/bin/bash

echo " --- Enter the Database name ---"
read databasename


echo " --- enter the table name --- "
read table_name

sqlite3 $databasename.db "DROP TABLE IF EXISTS $table_name;"

sqlite3 $databasename.db  "CREATE TABLE IF NOT EXISTS $table_name(cus_id INTEGER PRIMARY KEY AUTOINCREMENT UNIQUE,cus_name TEXT NOT NULL UNIQUE ,cus_domain TEXT UNIQUE, cus_status TEXT NOT NULL,Port INTEGER NOT NULL);"


echo " --- Enter the total number of rows do you want ---"
read cus_count


echo "--- Enter the following details one by one---"

port_num=8080

for((i=1;i<=cus_count;i++))
do


echo "enter the $i customer details"

echo "---Enter the customer name---"
read c_name

customer=$(sqlite3 $databasename.db "select cus_name from $table_name")



if [[ "$port_num" == "$port_num" ]]; then
port_num=$(($port_num + 1))
fi


if [[ $c_name != $customer ]]
then
    echo "---Enter the Status(Active/Inactive)---"
    read c_status



c_domain="$c_name"

else
    echo "---OOPS you entered customer name already available---"
    echo "---Please enter new customer name---"

i=$(($i - 1))

fi

sqlite3 $databasename.db "INSERT OR IGNORE INTO $table_name (cus_name,cus_domain,cus_status, Port) VALUES(\"$c_name\",\"${c_domain,,}.com\",\"$c_status\",\"$port_num\") ;" 


done

echo " --- Records from the $table_name ---"

sqlite3 $databasename.db "select * from $table_name;"

Answer 1

请参考下文“bash 脚本算术运算”

http://tldp.org/LDP/abs/html/arithexp.html

或

http://tldp.org/LDP/abs/html/ops.html