ssh using bash script for several nodes

Question

I can't seem to get this script to work. I am trying to query the amount of cpu's on a list of nodes in a file.

readarray fnames < nodes.txt

for fn in "${fnames[@]}"
do
  com="ssh $fn `cat /proc/cpuinfo | grep processor | wc -l`"
  com=${com: -2}
  echo $fn                        $com
done

It should print the hostname than number of cpu's. Instead it prints the hostname and 8 every time. I suspect the 8 is because of

bash: 8: command not found

being displayed.

I noticed it seems to always run the cat /proc/cpuinfo | grep processor | wc -l for the current hostname, which why it always returns 8. — Jacques MALAPRADE
– Jacques MALAPRADE, Commented Jan 29, 2015 at 17:31

Jacques MALAPRADE · Accepted Answer · 2015-01-29 20:27:47Z

1

Change it to this :

readarray fnames < nodes.txt

for fn in "${fnames[@]}"
do
  echo "getinfo:$fn"
  com="ssh $fn cat /proc/cpuinfo | grep processor | wc -l"
  com1=$($com) # or com1=`$com`
  echo "$fn                        $com1"
done

edited Jan 29, 2015 at 20:27

Jacques MALAPRADE

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answered Jan 29, 2015 at 18:04

michael501

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4 Comments

Jacques MALAPRADE Over a year ago

It comes up with ./cpus.sh: line 14: com: command not found error.

michael501 Over a year ago

@JacquesMALAPRADE , is this linux ? what version ? show listing

michael501 Over a year ago

@JacquesMALAPRADE , made change : com1=$($com)

Jacques MALAPRADE Over a year ago

I am running Ubuntu 14.04. I managed to get it to work. I will edit it above. Needs to be com1=backquote$com backquote

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