SSH commands and if statements

Drigo · 08-01-2011, 02:11 PM

So I want to run command through ssh but also run a if check in bash to see if a file exist. I know that to run ssh commands you do ssh user@server YOURCOMMAND

but if i need to run an if statements, how would this work??

colucix · 08-01-2011, 02:31 PM

It should work exactly as you mentioned, example:

Code:

ssh user@host "if [[ -f /path/to/some/file ]]; then echo file exists; else echo file not found; fi"

corp769 · 08-01-2011, 02:35 PM

Hello,

I used to use a small quick and dirty script in the past for something like this..... I just ran the ssh command along with 1>temp1.txt, and I tested the output against regular expressions. There are many ways to do this, it's all about how you want to tackle this. You could also just ssh into your remote server, and use a expect script of some sort to do your dirty work.

Cheers,

Josh

kailash19 · 08-01-2011, 02:37 PM

You can add she bang line in front for bash shell to sure.
ssh user@host "#!/bin/sh if [[ -f /path/to/some/file ]]; then echo file exists; else echo fi

colucix · 08-01-2011, 02:49 PM

Quote:

Originally Posted by kailash19

You can add she bang line in front for bash shell to sure.
ssh user@host "#!/bin/sh if [[ -f /path/to/some/file ]]; then echo file exists; else echo fi

This cannot work, first because the ! is interpreted as a shell's history call, second - even if you protect the ! using single quotes to embed the command - the sha-bang in interactive mode will be interpreted as a comment and the whole line will be ignored. The sha-bang is correctly interpreted only inside scripts.