[ale] Tinkering with Bash arrays.

[askabt]

Trying to write a script in Bash to generate an ssh config file from a 
list. The list will grow and shrink and the script will regenerate ssh's 
config file.

I know there is a better way to do this and probably this isn't the best 
approach.  But still was trying to do it with bash, just to figure it 
out if it can be done. Maybe someone knows where I need to look to 
figure it out, or maybe it's not possible. I'm fine either way.

This script builds several arrays from one array(file) to call them 
later in a loop. Will have to create a ./ssh_config file with variables 
to run script. Or generate your own arrays, I kept it short.

build_config () ; Works in theory but doesn't increment.

build_fail () ; Well it fails.

Running the build_fail Function will error out with

script: line 48: Host ${aaray$[f][0]}: bad substitution

or

script: line 48: Host ${aaray$f[0]}: bad substitution


#!/bin/bash

# Example file format for the ./ssh_config file, remove hash in file:
#{Host} {Hostname}
#bastion b.server.com
#mail mail.server.com
#mail2 mail2.server.com
#dns dns.server.com

# Establish Variables:
IFS=' '
readarray -t list < ./ssh_config


# Builds a set of arrays in loop $aaray{1..?}
# Loop to create individual aarays, range 1 through ${!list[@]}
for i in ${!list[@]}
    do

      declare -a aaray${i}
      declare "aaray${i}=( ${list[${i}]} )"

done


#
# Loop to build config file. Works but does not increment.
#
build_config () {

for i in ${!list[@]}; do

echo "Host ${aaray1[0]}"
echo "    Hostname ${aaray1[1]}"
echo

done
}

#
# Loop to increment $aaray[number] by on on each pass. Fails.
#
build_fail ()
{

for f in ${!list[@]}; do

echo "Host ${aaray$[f][0]}"
echo "    Hostname ${aaray$[f][1]}"
echo

done
}

# Toggle functions for testing

#build_config
build_fail

### EOF ###