UNIX for Dummies Questions & Answers

Hi,

I am new to shell script. I am trying to code on shell script but not able to find the correct syntax to write the code once it comes inside ssh.

For eg:

Code:

ssh -q HOST "
 
SwapInUse=\`vmstat -nm  | (while read; do echo "$(date +%Y%m%d.%H%M%S) $REPLY"; done) | tail -n +3 | awk '{print $4}'\`
 
echo \$SwapInUse
"

Does not work it suppose to.

Can someone please help and if possible can some one direct me to good link where I can read more about exceptions inside ssh.

Thanks,
Yagami

Code:

man ssh

and focus on the -n and -t and -T options

Hi,

Sorry but I am not able to understand the hint provided by you, can you please elaborate?

Thx.

did you try

Code:

# ssh HOST "SIU=`vmstat -nm | { while read line; do echo \"\$(date +%Y%m%d.%H%M%S) \$line\";done } | tail -n +3 | awk '{print\$4}'`;echo \"SIU=\$SIU\""
SIU=39512080

By the way, why not to setup a script directly on the remote machine and then just call it ?

Thanks for the help! But looks like that is also not giving the correct Swap In Use. I have couple of servers where I want to ssh so that might be a problem. Currently I am looping in HOST names and checking SIU.

I only focused on the syntax : i assumed the command you gave was providing the expected result.

If it is not the case, then fix it first (directly on the remote machine).

When you have fixed the command so that it displays the result you expect, then just show us which command you passed and we will try to help you to find out the right syntax to pass it via ssh