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Pass subshell through expect and SSH

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# 1  
Old 06-09-2010
Pass subshell through expect and SSH
Hi folks,

What I want to do is to check if there is an instance of running vlc on a remote server, then kill it, and start it again. The code I came up with is:
Code:
#!/bin/bash

expectFcn() {
  expect -c "
  set timeout -1
  spawn ssh \"$1@$2\" \"$4\"
  match_max 100000
  expect {
    -re \".*Are.*yes.*no.*\" {
      send \"yes\r\"
      exp_continue
    }
    \"*?assword:*\" {
      send \"$3\r\"
      send \"\r\"
      interact
    }
  }"
}

...

CMD="if [[ x$`pgrep -x vlc` != x ]]; then /usr/bin/killall -9 vlc; fi; vlc &;"
expectFcn $USER $REMOTE $PASS "$CMD"

but I got stuck at how to pass the subshell `pgrep -x vlc` to the remote through ssh and expect. The subshell is always invoked on the current machine rather than being sent to the remote and invoked there.

Any idea what I am doing wrong?

Thanks,

D.
# 2  
Old 06-09-2010
Hi, wouldn't it be easier to just kill it and start it anyway?

Code:
ssh user@host killall -9 vlc
ssh user@host vlc

Best regards,
Lakris
# 3  
Old 06-09-2010
Quote:
Originally Posted by Lakris
Hi, wouldn't it be easier to just kill it and start it anyway?

Code:
ssh user@host killall -9 vlc
ssh user@host vlc

Best regards,
Lakris
Yeah, I can do that, but I dont like the message "No process vlc found" if there is no instance of vlc is running. The if is to check if there is one running, then it will kill it, otherwise do nothing.

Another thing is that, passing subshell through ssh is fine with double quote, but putting it inside a expect script make it to be invoked on clients.

D.
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