UNIX for Dummies Questions & Answers

Dear unix experts,

i have a requirement as below.

i need to use SFTP as FTP.

Code:

 
ftp -n -v << ENDFTP
open test_ftp.server
user ftp_user_name ftp_password
quit
ENDFTP

if i use this in a shell script, it's not asking for password. But i want the similar thing achived using SFTP. (without asking for password). Can anyone please help me on this?

Thanks in advance

You have to install ssh keys for the user(s) that connects using your script. root access is usually blocked by sftp (ssh prototcol).

ssh-keygen: password-less SSH login

Hi...

i have generated public and private keys. now i am not sure how to proceed further. can you please help me on this.

Thanks

Ok,
Consider you have Server A and Server B, and you want to connect from A to B without password,
Since you have generated the keys, you copy the public key of Server A (id_Xsa.pub, whereX=d or r) and paste it on Server B (under <user home directory>/.ssh) directory of desired user as authorized_keys.

So Server A Public key (id_Xsa.pub) is copied to Server B as authorized_keys.

How try to ssh from A to B and it should work.

If you have ssh-copy-id that's a simple way to do it.

Code:

ssh-copy-id username@host

Presumably you want this to run from a scheduled script that does not need to be prompted for a password.

Once you have your keys set up properly (your originator's public key appended to the recipient's authorized_keys file) and you have done an initial connection "manually" (which makes it so that the recipient is notated in your own known_hosts file), have your script write your sftp commands into a file and execute sftp with the -b option.

For example,

Code:

sftp -b ${sftpCommandScript} ${userid}@${remoteHost}

where the sftpCommandScript file contains things like

Code:

put fromfilename tofilename
chmod 664 tofilename