Single Line sftp from Terminal

Question

Several times throughout the day, I may be running a test where I need to look through a log file on a remote server. I've gotten used to using my terminal to sftp into the remote server and pull the desired log file down to /tmp on my local machine.

I was looking through the options today using man sftp in an attempt to figure out a way to run the following commands basically in a single line so that I don't have to type a command, press enter, type a command press enter, etc.

(what I do now)

sftp myuser@myserver
--mypassword at prompt
lcd /tmp
get /dir/dir/dir/dir/file
quit

I found while looking through man sftp a reference to scp which I haven't used before. I feel it may be what I'm looking for, but I didn't see a way to specify where I wanted the securely copied file to go.

Could someone provide me with a way to get /dir/file from a remote server and have it download to /tmp/file_plus-my-description?

I was hoping to be able to run an sftp or scp command similar to a regularUNIX copy like:

scp myuser@myserver /dir/file /tmp/file_plus-my-description

I'm using the built in Terminal in Mac OS X 10.8. Thanks.

Answer 1

Update Sep 2017 - tl;dr

Download a single file from a remote ftp server to your machine:

sftp {user}@{host}:{remoteFileName} {localFileName}

Upload a single file from your machine to a remote ftp server:

sftp {user}@{host}:{remote_dir} <<< $'put {local_file_path}'

---

Original answer:

Ok, so I feel a little dumb. But I figured it out. I almost had it at the top with:

sftp user@host remoteFile localFile

The only documentation shown in the terminal is this:

sftp [user@]host[:file ...]
sftp [user@]host[:dir[/]]

However, I came across this site which shows the following under the synopsis:

sftp [-vC1 ] [-b batchfile ] [-o ssh_option ] [-s subsystem | sftp_server ] [-B buffer_size ] [-F ssh_config ] [-P sftp_server path ] [-R num_requests ] [-S program ] host 
sftp [[user@]host[:file [file]]] 
sftp [[user@]host[:dir[/]]]

So the simple answer is you just do : after your user and host then the remote file and local filename. Incredibly simple!

Single line, sftp copy remote file:

sftp username@hostname:remoteFileName localFileName
sftp kyle@kylesserver:/tmp/myLogFile.log /tmp/fileNameToUseLocally.log

Update Feb 2016

In case anyone is looking for the command to do the reverse of this and push a file from your local computer to a remote server in one single line sftp command, user @Thariama below posted the solution to accomplish that. Hat tip to them for the extra code.

sftp {user}@{host}:{remote_dir} <<< $'put {local_file_path}'