appending values in a dynamic array

Question

#!/bin/bash

range=$(seq -f "cen%04g" 1052 1099) 
range1=$(seq -f "rh%04g" 1052 1099)  

check () {
for node1 in ${range};do
   ping -q -c 1 -w 3 -s 10 $node1 >/dev/null
   if [ $? -eq 0 ];then
       $i_up+=(${node1}",")
   else
       $i_down+=(${node1}",")
   fi
done
}

for i in "site1" "site2" "site3"
do
   declare -a $i_down
   declare -a $i_up
   check &
done

1. I'm not sure how can I name the array based on for loop input so that it can run sites(site1,site2,site3) in parallel and get the array input in separate for each site. Else running each will take longer time.
2. I have range on series cen(1052 to 1099) and if its not found there, I need to check with different series(rh) with same numbers. eg: cen1052 isn't there it needs to check rh1052. how can do that.

Answer 1

I think you are looking for parset:

checkhost() {
    piing() {
        ping -q -c 1 -w 3 -s 10 "$1" >/dev/null
    }
    if piing "cen$1"; then
      echo "+cen$1"
    else
      if piing "rh$1"; then
         echo "+rh$1"
      else
        if piing "deb$1"; then
           echo "+deb$1"
        else
           echo "-cen$1"
        fi
      fi
    fi
}
export -f checkhost
parset updown -j0 checkhost ::: {1052..1099}
echo "${updown[@]}"

It is unclear to me how the you need the sites to work. If, say, it was simply a domain name to append, you can do:

parset updown -j0 checkhost {1}.{2} ::: {1052..1099} ::: site1.com site2.com site3.com

parset is part of GNU Parallel. After installing GNU Parallel you need to activate parset by:

• (permanently) env_parallel --install followed by starting a new shell
• (this session only) . $(which env_parallel.bash)

If this is not what you are looking for, I suggest you make a full example that works, but does so in serial.