如何使用bash脚本从csv文件中读取特定的整数？

Question

我已经写了一个bash脚本（下面）来将数据添加到csv文件，现在我想从这个csv文件中读取一个特定的整数。我该怎么做？

我使用了'cat'命令但它打开了整个文件。但是我不想要那个，我想打开，例如id为1的客户。

另一方面，如何更新csv文件中的文件。例如，客户名称在csv文件中保存为“John”。通过使用更新功能，我想将他的名字改为'Mattew Moniz'。我怎样才能做到这一点？

#!/bin/bash
#Final Project 

while :
do

clear

echo "          ITC 350-Open Source Software Project "
echo ""
echo " ==================================================="
echo "    Customer Account Banking System          "
echo " ==================================================="

echo -e "\e[31m1) Create a new customer account\e[0m"       #red
echo -e "\e[32m2) Update account data\e[0m"                 #green
echo -e "\e[33m3) View and manage transaction\e[0m"         #orange
echo -e "\e[34m4) Check customers account details\e[0m"     #blue
echo "5) Delete customer's account"
echo -e "\e[36m6) Exit\e[0m"                                #gray
echo ""
echo ""
echo -e "\e[32mPlease choose an option:\e[1m"               #ligh green 
read usr_cmd

clear

case $usr_cmd in 

1) echo "Enter customer name: "
read cus_name
while ! [[ $cus_name =~ ^-?[[:alpha:]]+$ || $cus_name =~ " " ]]; do
    echo "Please enter a valid name"
    read cus_name
done


echo "Enter customer DOB: "
read cus_dob


echo "Enter customer national ID number: "
read cus_national_num

while ! [[ $cus_national_num =~ ^-?[[:digit:]]+$ ]]; do
    echo "Please enter a valid customer national ID number "
    read cus_national_num
done

echo "Enter customer email address: "
read cus_email

echo "Enter cutomer city: "
read cus_city

while ! [[ $cus_city =~ ^-?[[:alpha:]]+$ || $cus_city =~ " " ]]; do
    echo "Please enter a valid city"
    read cus_city
done

echo "Enter customer country : "
read cus_country

while ! [[ $cus_country =~ ^-?[[:alpha:]]+$ || $cus_country =~ " " ]]; do
    echo "Please enter a valid country "
    read cus_country
done


echo "Enter contact number: "
read cus_phone_num

while ! [[ $cus_phone_num =~ ^-?[[:digit:]]+$ ]]; do
    echo "Please enter a valid customer contact number "
    read cus_phone_num
done

echo "Enter type of the account (Saving/Current): "
read cus_account_type


echo "Enter first deposit amount : "
read cus_first_deposit 

while ! [[ $cus_first_deposit =~ ^-?[[:digit:]]+$ ]]; do
    echo "Please enter a valid customer first deposit amount "
    read cus_first_deposit
done

;;
# For this part I must write the code to generate a unique customer reg. number automatically
2) echo "Enter the customer registration number to update account data:  "
read cus_reg_num

echo "Enter customer name: "
read cus_name

while ! [[ $cus_name =~ ^-?[[:alpha:]]+$ || $cus_name =~ " " ]]; do
    echo "Please enter a valid name"
    read cus_name
done

echo "Enter customer DOB: "
read cus_dob

echo "Enter customer national ID number: "
read cus_national_num

while ! [[ $cus_national_num =~ ^-?[[:digit:]]+$ ]]; do
    echo "Please enter a valid customer national ID number "
    read cus_national_num
done

echo "Enter customer email address: "
read cus_email

echo "Enter customer city: "
read cus_city

while ! [[ $cus_city =~ ^-?[[:alpha:]]+$ || $cus_city =~ " " ]]; do
    echo "Please enter a valid city"
    read cus_city
done


echo "Enter customer country: "
read cus_country

while ! [[ $cus_country =~ ^-?[[:alpha:]]+$ || $cus_country =~ " " ]]; do
    echo "Please enter a valid country "
    read cus_country
done

echo "Enter customer contact number: "
read cus_phone_num

while ! [[ $cus_phone_num =~ ^-?[[:digit:]]+$ ]]; do
    echo "Please enter a valid customer contact number "
    read cus_phone_num
done


echo "Enter type of the account (Saving/Current): "
read cus_account_type

while ! [[ $cus_country =~ ^-?[[:alpha:]]+$ || $cus_country =~ " " ]]; do
    echo "Please enter a valid account type "
    read cus_country
done

echo "Enter first deposit amount: "
read cus_first_deposit

while ! [[ $cus_phone_num =~ ^-?[[:digit:]]+$ ]]; do
    echo "Please enter a valid customer first depsit amount: "
    read cus_phone_num
done


;;

#I must write the code to bring changes to the customer's money from csv file
3) echo "Which operation would you like to process with: "

echo "1) Deposit"
read cus_deposit_to_account

echo "2) Withdraw"
read cus_withdraw


;;

#I must write the code to get the data from FINAL_PROJECT.cvs file and display it
4) echo "Enter the customer's registration number to view details: "
read view_cus_reg_num


;;

#I must write the code to delete the customer from FINAL_PROJECT.csv
5) echo "Enter the customer's registration number to delete: "
read cus_reg_num

;;


6)break;;
*) echo "Invalid option";;
esac

echo "Press 6 to quit, anything else to continue: " 
read confirm_exit 
if [ $confirm_exit -eq 6 ]
then break
fi
done



echo "Customer Name", "Customer DOB", "Customer National ID Number", "Customer Email Address", "Customer City", "Customer Country", "Customer Contact Number", "Customer Account Type", "Customer First Deposit Amount" >> FINAL_PROJECT.csv

echo "$cus_name", "$cus_dob", "$cus_national_num", "$cus_email", "$cus_city", "$cus_country", "$cus_phone_num", "$cus_account_type", "$cus_first_deposit" >> FINAL_PROJECT.csv

#awk '!x[$1]++ && ! /^[[:blank:]]*$/' OSSGrades.csv

grep . FINAL_PROJECT.csv | awk '!a[$1]++' >> FINAL_PROJECT.csv

Answer 1

要在第三列中查找ID 1，您可以使用grep：

grep '^\([^,]*, \)\{2\}1,' file.csv

• ^匹配线的开头;
• [^,]匹配除逗号之外的任何字符;
• *意味着零次或多次，所以[^,]*匹配零个或多个非逗号;
• 这里使用\(...\)来分组“列”;
• \{2\}说前一个元素（上面提到的组）必须重复两次，即id前面有两列。

请注意，这仅适用于简单的CSV文件。对于真实的，可以在单元格中包含引用或转义的逗号甚至换行符，您将需要一种真正的编程语言而不是shell。