[ale] Tinkering with Bash arrays.

[James Sumners]

This really would be a lot simpler with Ansible and local actions.

On Sun, Jun 25, 2017 at 21:48 askabt <askabt at gmail.com> wrote:

> 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 ###
>
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-- 
James Sumners
http://james.sumners.info/ (technical profile)
http://jrfom.com/ (personal site)
http://haplo.bandcamp.com/ (music)
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