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While loop Error in one line

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# 1  
Old 12-23-2017
IBM While loop Error in one line
Code:
ssh -q Node_name lspv |egrep -w 'hdisk0|hdisk1' |awk '{print $1}' |while read line; do echo $line " " ssh -q Node_name `bootinfo -s $line`;done

Please let me know why i getting this error
Last edited by jim mcnamara; 12-23-2017 at 01:25 PM..
# 2  
Old 12-23-2017
You are missing a lot of quotes, but it is hard to untangle.
What I do:

1. create a multiline script that works when on my home box ( assuming it is the same as the remote, otherwise create the code over on the remote)

2. scp -p the script to the remote

3.
Code:
ssh Node_name /path/to/myscript.sh

# 3  
Old 12-23-2017
Hi Jim,
Thanks for your quick reply.I did made some changes...
now the issue the script is only going to first disk info.. it is not taking 2nd disk in loop

Here is the updated code....the code is ending after hdisk0 "After first disk"


Code:
ssh -q node_name lspv |egrep -w 'hdisk0|hdisk1' |awk '{print $1}' |while read line; do
echo $line
outp=`ssh -q node_name bootinfo -s $line`
echo $outp
done


Code:
+ ssh -q Node_name lspv
+ egrep -w hdisk0|hdisk1
+ awk {print $1}
+ read line
+ echo hdisk0
hdisk0
+ + ssh -q Node_name bootinfo -s hdisk0
outp=140013
+ echo 140013
140013
+ read line

why it is not going to hdisk1 ?
Last edited by Don Cragun; 12-23-2017 at 03:34 PM.. Reason: Add CODE tags.
# 4  
Old 12-23-2017
Hi javedwmu,
Presumably, it doesn't go to hdisk1 because the output from the pipeline:
Code:
ssh -q node_name lspv |egrep -w 'hdisk0|hdisk1' |awk '{print $1}'

only has a line matching hdisk0 and not a line matching hdisk1. Please show us the output you get from the pipeline:
Code:
ssh -q node_name lspv |egrep -w 'hdisk0|hdisk1'

(in CODE tags).
Last edited by Don Cragun; 12-23-2017 at 05:56 PM.. Reason: Fix typo s/only a/only has a/
# 5  
Old 12-23-2017
Hi Don,
it is getting two disks.

Here is the output of the command

Code:
ssh -q Node_name lspv |egrep -w 'hdisk0|hdisk1'
hdisk0 00f8122de92xxxxx rootvg active
hdisk1 00f8122d43xxxxxx old_rootvg

Moderator's Comments:
Mod Comment Continued refusal to use CODE tags when displaying sample input, output, and code segments (as required by the forum rules you agreed to when joining this forum) may result in you being banned from this site.

And removing CODE tags that have been inserted for you by a moderator is no way to win support.
Last edited by Don Cragun; 12-23-2017 at 09:08 PM.. Reason: Re-add CODE tags again.
# 6  
Old 12-23-2017
Quote:
Originally Posted by javedwmu
Hi Don,
it is getting two disks.

Here is the output of the command

Code:
ssh -q Node_name lspv |egrep -w 'hdisk0|hdisk1'
hdisk0 00f8122de92xxxxx rootvg active
hdisk1 00f8122d43xxxxxx old_rootvg

Moderator's Comments:
Mod Comment Continued refusal to use CODE tags when displaying sample input, output, and code segments (as required by the forum rules you agreed to when joining this forum) may result in you being banned from this site.

And removing CODE tags that have been inserted for you by a moderator is no way to win support.
I don't see anything obvious that should fail in the loop you have shown us. What operating system and shell are you using?

What happens if you try the simpler script:
Code:
set -xv
ssh -q node_name lspv | grep -wo 'hdisk[01]' | while read line
do	echo $line
	outp=`ssh -q node_name bootinfo -s $line`
	echo "$outp"
done

# 7  
Old 12-24-2017
Certainly the ssh sucks from the loop input (pipe).
Even the `subshell` connects to the input.
You need ssh -n ... or </dev/null ssh ... .
This User Gave Thanks to MadeInGermany For This Post:
Don Cragun
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