Add support for different OS package managers; simplify some logic

install_programs

@@ -17,9 +17,7 @@ while [[ $# > 0 ]]; do
     shift
 done
 
-local script_dir=$(cd $(dirname "${ZSH_SOURCE[0]}") &> /dev/null && pwd)
-log "install_programs // script_dir: $script_dir -- args: $single_script_filter"
-cd $script_dir
+log "install_programs // single_script_filter: $single_script_filter"
 local scripts=(`find ./installs_and_builds -maxdepth 1 -mindepth 1 -type f`)
 for script in $scripts; do
     if [[ -x $script ]]; then