我正在使用bash脚本进行DBMS项目。我遇到了一个问题No such file or directory，但该文件已经存在，并且它也在工作，但当我从Main_Menu文件中获取此文件时，它无法按预期工作。有时它可以工作，有时不可以。

Drop_DB.sh：

#!/bin/bash

read -rp "Enter the name of db you want to remove: " db_name

# we use this variable as flag to check everything is ok.
error=""

# function for validations
function validation {
    if [ -d "./DataBases" ]
    then
        error="0"
    else
        error="1"
        echo "Error! DataBases file not exist ❌"
    fi

    if [ -d "./DataBases/$db_name" -a $error = 0 ]
    then
        error="0"
    else
        error="1"
            echo "Error! No Database with this name: $db_name ❌"
    fi
}

# Call function validation first
validation

if [ $error -eq 0 ]
then
        rm -r "./DataBases/$db_name"
    echo "Database: $db_name deleted successfully ✓ ✓"
else

    echo "Can't complete this action ❌"
fi

List_DB.sh：

#!/bin/bash

error=""
function validation {
    
    if [ -d "./DataBases" ]
    then
        error="0"
    else
        error="1"
        echo "Error! DataBases file not exist ❌"
    fi

    if [ ! -d "./DataBases/" -a $error = 0 ]
    then
        error="1"
        echo "Error! There's no DBs yet ❌"
    else
        error="0"
    fi
}

# call validation function
validation

if [ $error -eq 0 ]
then
    # 3 - display only directories.
    cd ./DataBases
    ls -d */
else
    echo "Can't complete this action ❌❌"
fi

主菜单.sh

#!/bin/bash

options=("Create Database" "List Databases" "Connect To Databases" "Drop Database" "Exit")

PS3="Enter choices from 1 to 5: "
while [[ "$choice" != "Exit" ]]
do
    echo " "
    select choice in "${options[@]}"
    do
        case $choice in
            "Create Database" ) source ./Create_DB.sh
                  break
                    ;;
            "List Databases" ) source ./List_DB.sh
                  break
                ;;
            "Connect To Databases" ) source ./Connect_DB.sh
                   break
                ;;
            "Drop Database" ) source ./Drop_DB.sh
                break
                ;;
            "Exit" ) exit
                break
                ;;
            *) echo "Invalid input please try again later"
                    ;;
        esac
    done
done

我以为文件需要执行权限，但我错了：

$ ls -l 
-rwxrwxr-x. 1 aem aem  804 Apr  8 14:45 Drop_DB.sh
-rwxrwxr-x. 1 aem aem  696 Apr  8 14:41 Mainmenu.sh

下面是错误：

./Mainmenu.sh: line25: ./Drop_DB.sh: No such file or directory

********************************"No such file or directory" but it exists，但仍具有相同的错误。
编辑：

我这里的问题是我在List_DB.sh文件中做了cd来列出那里的所有目录。所以，在执行List_DB.sh之后，我的pwd是DataBases/$DB_Name目录，脚本位于另一个路径，这意味着DataBases/$DB_Name中的No such file or directory。我通过在List_DB.sh文件中添加cd ..来解决这个问题，以返回主文件夹。