Shell Programming and Scripting

Hi Everyone,

We are migrating from FTP to SFTP. We used the following script for FTP:

Code:

echo "ftp -np -i -v << EOF" >>  ${FTP_READY_FILE}
echo "open ${SRC_FTP_SERVER} "  >> ${FTP_READY_FILE}
echo "user ${SRC_FTP_USER} ${SRC_FTP_PWD}" >> ${FTP_READY_FILE}
echo "binary" >> ${FTP_READY_FILE}
echo "cd ${FTPDIR} ">> ${FTP_READY_FILE}
echo "lcd ${GETDIR} ">> ${FTP_READY_FILE}
echo "mget ${FileName}*${SRC_OKFILE_XTN_1}" >> ${FTP_READY_FILE}
echo "bye" >> ${FTP_READY_FILE}
echo "EOF" >> ${FTP_READY_FILE}

This code needs to be converted to SFTP code.

The admin people have generated some private and public keys, but I don't know where to place it. Assuming that I have to move files from Server A to Server B, can someone please let me know where to place the keys. Also what changes need to be made to the script to make it work with SFTP?

sftp is not an ftp substitute, it's just ftp-like. Adapting it often means rewriting.

That script looks kind of silly from the get-go, honestly. Why write to a file when you can feed it in directly?

How about:

Code:

sftp username@host <<EOF
cd ${FTPDIR}
lcd ${GETDIR}
mget ${FileName}*${SRC_OKFILE_XTN_1}
bye
EOF

On some systems, you should do sftp -b. If you don't have that option, you're not one of those systems.

Do not indent the last EOF, or the here-document will never end.

What key files do you have?

Hi Corona688,

Many thanks for the quick reply. Yes you are right, the script is kind of silly, but thats how the system was designed in the first place. So they exported everything in a file, then ran the file.

I am sure that the script that you wrote will definitely solve my problem, but for passwordless authentication we need to keep the public key and private key generated for a user to a particular directory in either Server A or Server B or both. Now I am not sure where the files should be kept (its someting like /.ssh/xxx). Can you please let me know the exact locations where the files should be kept to enable passwordless authentication?

Under $USERNAME/.ssh. Set file permissions to 0600 and directory permissions to 0700.

You mean that if I need to move files from Server A (which has the SFTP daemon) to Server B, I need to place the public key in /home/<user>/.ssh/ in Server B?

And what about the private key?

The private key must go on the machine you're running 'sftp username@host' upon. The machine you're logging into, only gets the public key listed in ~/.ssh/authorized_keys.

If you have it, the ideal way would be to just put the keys on the client machine, then 'ssh-copy-id username@host' to copy everything exactly as needed onto the server.

It's difficult to give exact, precise instructions since you didn't tell me what kind of key files you were given when asked(dsa, rsa, other?), just repeated the vague nebulous 'files'... But see passwordless logins with openssh and skip the key-generation steps to see what you need to do.