Bash script to compile a SourceMod plugin on Linux for multiple compiler versions. For Windows, see Python script: https://gist.github.com/Rainyan/ce55dec3d07742311bbfdc070e4a5b4f

multicomp.sh

#!/usr/bin/env bash

# file name without the extension
Plugin=my_plugin

declare -a SmVersions=("1.8" "1.9" "1.10" "1.11" "1.12" "1.13")

BasePath=~/code/spcomp
ExtraIncludes="${BasePath}/includes"

for version in "${SmVersions[@]}"
do
    # assuming 32bit compiler
    compiler="${BasePath}/${version}/addons/sourcemod/scripting/spcomp"
    "$compiler" -i "$ExtraIncludes" "./scripting/${Plugin}.sp"
done