在Mac中使用终端应用程序将.p12文件转换为.pem。“没有此类文件或目录”错误？

Question

I have export the "Apple Development IOS Push Service" certificate from Keychain Access and save the "apns-dev-cert.p12" in my desktop. I want to enable Apple Push Notification I have followed these blogs to convert apns-dev-cert.p12 to apns-dev-cert.pem from Terminal app,

http://bhaveshkumbhani.blogspot.in/2011/12/convert-p12-to-pem-for-apns.html
http://www.raywenderlich.com/3443/apple-push-notification-services-tutorial-part-12
Apple Document RemoteNotificationPG.pdf

I have used these commands in Terminal,

    1.V******-Ms-iMac-2:~ c*****$ openssl pkcs12 -in apns-dev-cert.p12 -out apns-dev-cert.pem -nodes -clcerts
        Response : Error opening input file apns-dev-cert.p12
        Certificates.p12: No such file or directory
    2.V******-Ms-iMac-2:~ c*****$ openssl pkcs12 -clcerts -nokeys -out apns-dev-cert.pem -in apns-dev-cert.p12
        Response : Error opening input file apns-dev-cert.p12
        Certificates.p12: No such file or directory
    3.V******-Ms-iMac-2:~ c*****$ ls
            All_iOS_Applications_Document.doc   Pictures
            AppStoreSubmissionSteps.doc     Public
            Desktop                 Sites
            Documents               Softwares
            Downloads               Untitled.txt
            Dropbox                 pic
            Library                 pic.zip
            Movies                  pricelist.txt
            Music                   sms.txt
            Nana_User_Case_Documents.odt
   4. V******-Ms-iMac-2:~ c*****$ cd
   5.V******-Ms-iMac-2:~ c*****$ cd/Users/c*****/Desktop/A
-bash: cd/Users/c*****/Desktop/A: No such file or directory

I can't understand why the terminal always saying "No such file or directory"?. Where i need to save the .p12 file in my Mac?

Am using Terminal app Version 2.1.2 (273.1). Mac OS X version 10.6.8 Terminal app Version 2.1.2 (273.1). Mac OS X version 10.6.8 .

Can you please what i need to do? I need to enable the APNS by using the .pem file. Please help me. Thanks in advance.

EDIT:

I have added tried Raywenderlich.com termial code in my mac Terminal app

1. V******-Ms-iMac-2:~ c*****$ pwd
/Users/creagx
2. V******-Ms-iMac-2:~ c*****$ cd/ Users/creagx/Desktop/A
-bash: cd/: No such file or directory

Answer 1

Type in:

cd /Users/creagx/Desktop/A (Space between cd and Slash: cd[SPACE]/Users/creagx/Desktop/A

if there is a Folder named "A" on your Desktop where the p12 files are in.

Then go on with the other Commands

openssl pkcs12 -in apns-dev-cert.p12 -out apns-dev-cert.pem -nodes -clcerts

openssl pkcs12 -clcerts -nokeys -out apns-dev-cert.pem -in apns-dev-cert.p12