How do I create a directory on remote host if it doesn't exist without ssh-ing in?


Question

I'm not sure if this is possible or not. Basically, I'm writing a script that allows me to scp a file to my hosting. This is it so far. Argument 1 is the file and argument 2 is the folder I want it to be placed in on the remote server:

function upload {
    scp $1 myusername@ssh.myhost.net:$2
}

As you may/may not know, if the directory I specify when I call the function doesn't exist, then the transfer fails. Is there a way to check if the directory exists in the function and if it doesn't, create it.

I would prefer not having to ssh in every time and create the directory, but if I have got no choice, then I have got no choice.

1
52
7/18/2012 4:16:15 PM

Accepted Answer

You can use rsync.

For example,

rsync -ave ssh fileToCopy ssh.myhost.net:/some/nonExisting/dirToCopyTO

Note about rsync:

rsync is utility software and network protocol for Unix which synchronizes files and directories from one location to another while minimizing data transfer by using delta encoding when appropriate using the rsync algorithm which is faster than other tools.

32
6/24/2014 6:32:01 PM

I assume you mean you don't want to interactively log in and create directories by hand, rather than that you want to avoid using ssh altogether, since you still need a password or public key with scp.

If using ssh non-interactively is acceptable, then you can stream your file using cat over ssh:

cat $1 | ssh $2 "mkdir $3;cat >> $3/$1"

where

$1 = filename 
$2 = user@server
$3 = dir_on_server

If the directory already exists, mkdir complains but the file is still copied over. The existing directory will not be overwritten. If the directory does not exist, mkdir will create it.


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