diff --git a/install.sh b/install.sh
index 671313d..b6bbaf8 100755
--- a/install.sh
+++ b/install.sh
@@ -4,23 +4,23 @@ set -e
 
 SCRIPT_DIR=${2:-$(CDPATH= cd -- "$(dirname -- "$0")" && pwd -P)}
 
-CLR_SUCCESS="\033[1;32m"    # BRIGHT GREEN
-CLR_WARN="\033[1;33m"       # BRIGHT YELLOW
-CLR_CLEAR="\033[0m"         # DEFAULT COLOR
-ECHO='echo'
+export CLR_SUCCESS="\033[1;32m"    # BRIGHT GREEN
+export CLR_WARN="\033[1;33m"       # BRIGHT YELLOW
+export CLR_CLEAR="\033[0m"         # DEFAULT COLOR
+export ECHO='echo'
 
-HOMEBREW_NO_AUTO_UPDATE=1
+export HOMEBREW_NO_AUTO_UPDATE=1
 
 # when not outputing to a tty, add spacing instead of colors
 if [ ! -t 1 ]; then
-    CLR_SUCCESS="\n------------------------------------------------------------------------------------------------------------------------\n"
-    CLR_WARN=$CLR_SUCCESS
-    CLR_CLEAR=$CLR_SUCCESS
-    ECHO='printf'
+    export CLR_SUCCESS="\n------------------------------------------------------------------------------------------------------------------------\n"
+    export CLR_WARN=$CLR_SUCCESS
+    export CLR_CLEAR=$CLR_SUCCESS
+    export ECHO='printf'
 fi
 
-AM_HOME="$HOME/.am"
-AM_PROMPT="$AM_HOME/prompt"
+export AM_HOME="$HOME/.am"
+export AM_PROMPT="$AM_HOME/prompt"
 
 __am_prompt_success() {
     $ECHO "${CLR_SUCCESS}prompt-install: $1${CLR_CLEAR}"
@@ -80,19 +80,29 @@ __am_prompt_install() {
         fi
     done
 
-    local UNAME=$(uname | tr '[:upper:]' '[:lower:]')
-    local UNAME_INSTALL="$UNAME.sh"
-
     if [ -f /etc/os-release ]; then
         . /etc/os-release
-
-        local UNAME_INSTALL="$ID.sh"
+        local UNAMES="$ID $ID_LIKE"
+    else
+        local UNAMES=$(uname | tr '[:upper:]' '[:lower:]')
     fi
 
-    if [ -f "$AM_PROMPT/sh/install/$UNAME_INSTALL" ]; then
-        __am_prompt_success "installing platform prerequisites ($UNAME_INSTALL)"
-        . "$AM_PROMPT/sh/install/$UNAME_INSTALL"
-    fi
+    local UNAME=
+    until [ "$UNAME" = "$UNAMES" ]; do
+        local UNAME=${UNAMES%%' '*}
+        local UNAMES=${UNAMES#*' '}
+
+        local UNAME_PATH="$AM_PROMPT/sh/install/$UNAME.sh"
+
+        if [ ! -f "$UNAME_PATH" ]; then
+            continue
+        fi
+
+        __am_prompt_success "installing platform prerequisites ($UNAME)"
+        . "$UNAME_PATH"
+
+        break
+    done
 
     if [ ! -d "$AM_PROMPT/zsh/completions" ]; then
         mkdir -p "$AM_PROMPT/zsh/completions" 1>/dev/null
@@ -128,16 +138,16 @@ __am_prompt_install() {
     local PROMPT_SHELL=$(echo $PROMPT_SHELL | tr '[:upper:]' '[:lower:]')
 
     # use the correct shell
-    . "$AM_PROMPT/sh/scripts/use-shell" $PROMPT_SHELL
+    "$AM_PROMPT/sh/scripts/use-shell" $PROMPT_SHELL
 
     # open the changelog url
-    . "$AM_PROMPT/sh/scripts/open-url" "https://github.com/automotivemastermind/prompt/blob/$PROMPT_SHA/CHANGELOG.md"
+    "$AM_PROMPT/sh/scripts/open-url" "https://github.com/automotivemastermind/prompt/blob/$PROMPT_SHA/CHANGELOG.md"
 }
 
-echo
-echo "${CLR_WARN}prompt: establishing sudo (you may be prompted for credentials)...${CLR_CLEAR}"
+$ECHO
+$ECHO "${CLR_WARN}prompt: establishing sudo (you may be prompted for credentials)...${CLR_CLEAR}"
 sudo echo
 
-trap 'echo; echo; echo "${CLR_WARN}prompt: terminating install...${CLR_CLEAR}"; exit -1;' INT
+trap '$ECHO; $ECHO; $ECHO "${CLR_WARN}prompt: terminating install...${CLR_CLEAR}"; exit 1;' INT
 
 __am_prompt_install $@
diff --git a/src/bash/scripts/eval/source-os b/src/bash/scripts/eval/source-os
index 3b9d360..3477a48 100755
--- a/src/bash/scripts/eval/source-os
+++ b/src/bash/scripts/eval/source-os
@@ -2,27 +2,35 @@
 
 __am_prompt_source_os() {
 
-    local UNAME=$(uname | tr '[:upper:]' '[:lower:]')
-	local UNAME_PATH="$HOME/.am/prompt/bash/scripts/$UNAME"
-
     if [ -f /etc/os-release ]; then
         . /etc/os-release
+        local UNAMES="$ID $ID_LIKE"
+    else
+        local UNAMES=$(uname | tr '[:upper:]' '[:lower:]')
+    fi
+
+    local UNAME=
+    until [ "$UNAME" = "$UNAMES" ]; do
+        local UNAME=${UNAMES%%' '*}
+        local UNAMES=${UNAMES#*' '}
 
-        local UNAME="$ID"
         local UNAME_PATH="$HOME/.am/prompt/bash/scripts/$UNAME"
-    fi
 
-	if [ -d "$UNAME_PATH" ]; then
+        if [ ! -d "$UNAME_PATH" ]; then
+            continue
+        fi
+
+        export AM_PROMPT_OS=$UNAME
         export PATH="$UNAME_PATH:$PATH"
-	fi
 
-    if [ -d "$UNAME_PATH/eval" ]; then
-		for EVAL_SCRIPT in $UNAME_PATH/eval/*; do
-			. "$EVAL_SCRIPT"
-		done
-    fi
+        if [ -d "$UNAME_PATH/eval" ]; then
+            for EVAL_SCRIPT in $UNAME_PATH/eval/*; do
+                . "$EVAL_SCRIPT"
+            done
+        fi
 
-    export AM_PROMPT_OS=$UNAME
+        break
+    done
 }
 
 __am_prompt_source_os
diff --git a/src/sh/scripts/eval/source-os b/src/sh/scripts/eval/source-os
index 7380024..92211d4 100755
--- a/src/sh/scripts/eval/source-os
+++ b/src/sh/scripts/eval/source-os
@@ -2,27 +2,35 @@
 
 __am_prompt_source_os() {
 
-    local UNAME=$(uname | tr '[:upper:]' '[:lower:]')
-	local UNAME_PATH="$HOME/.am/prompt/sh/scripts/$UNAME"
-
     if [ -f /etc/os-release ]; then
         . /etc/os-release
+        local UNAMES="$ID $ID_LIKE"
+    else
+        local UNAMES=$(uname | tr '[:upper:]' '[:lower:]')
+    fi
+
+    local UNAME=
+    until [ "$UNAME" = "$UNAMES" ]; do
+        local UNAME=${UNAMES%%' '*}
+        local UNAMES=${UNAMES#*' '}
 
-        local UNAME="$ID"
         local UNAME_PATH="$HOME/.am/prompt/sh/scripts/$UNAME"
-    fi
 
-	if [ -d "$UNAME_PATH" ]; then
+        if [ ! -d "$UNAME_PATH" ]; then
+            continue
+        fi
+
+        export AM_PROMPT_OS=$UNAME
         export PATH="$UNAME_PATH:$PATH"
-	fi
 
-    if [ -d "$UNAME_PATH/eval" ]; then
-		for EVAL_SCRIPT in $UNAME_PATH/eval/*; do
-			. "$EVAL_SCRIPT"
-		done
-    fi
+        if [ -d "$UNAME_PATH/eval" ]; then
+            for EVAL_SCRIPT in $UNAME_PATH/eval/*; do
+                . "$EVAL_SCRIPT"
+            done
+        fi
 
-    export AM_PROMPT_OS=$UNAME
+        break
+    done
 }
 
 __am_prompt_source_os
diff --git a/src/sh/scripts/use-shell b/src/sh/scripts/use-shell
index df422ac..044a6f4 100755
--- a/src/sh/scripts/use-shell
+++ b/src/sh/scripts/use-shell
@@ -3,11 +3,11 @@
 __am_prompt_use_shell() {
 
     local PROMPT_SHELL=$1
-    local ECHO=${ECHO:-"echo"}
+    ECHO=${ECHO:-"echo"}
 
     if [ -z "${PROMPT_SHELL:-}" ]; then
-        echo "${CLR_FAIL}You must specify a shell to use, either bash or zsh.${CLR_CLEAR}"
-        exit 1
+        $ECHO "${CLR_FAIL}You must specify a shell to use, either bash or zsh.${CLR_CLEAR}"
+        return 1
     fi
 
     if [ -f /opt/homebrew/bin/brew ]; then
@@ -21,40 +21,63 @@ __am_prompt_use_shell() {
     fi
 
     local PROMPT_SHELL_PATH="$LOCAL_PREFIX/bin/$PROMPT_SHELL"
-    local UNAME=$(uname | tr '[:upper:]' '[:lower:]')
-    local UNAME_INSTALL="$UNAME.sh"
+    local INSTALL_PATH="$AM_PROMPT/$PROMPT_SHELL/install"
 
     if [ -f /etc/os-release ]; then
         . /etc/os-release
-
-        local UNAME_INSTALL="$ID.sh"
+        local UNAMES="$ID $ID_LIKE"
+    else
+        local UNAMES=$(uname | tr '[:upper:]' '[:lower:]')
     fi
 
-    if [ -f "$AM_PROMPT/$PROMPT_SHELL/install/$UNAME_INSTALL" ]; then
-        . "$AM_PROMPT/$PROMPT_SHELL/install/$UNAME_INSTALL"
+    local UNAME=
+    until [ "$UNAME" = "$UNAMES" ]; do
+        local UNAME=${UNAMES%%' '*}
+        local UNAMES=${UNAMES#*' '}
+
+        local UNAME_PATH="$INSTALL_PATH/$UNAME.sh"
+
+        if [ ! -f "$UNAME_PATH" ]; then
+            continue
+        fi
+    done
+
+    if [ ! -f "$UNAME_PATH" ]; then
+      $ECHO "${CLR_WARN}prompt: shell cannot be installed on this platform."
+      $ECHO "Please open an issue to request support for this distribution.${CLR_CLR}"
+      return 1
     fi
 
+    . "$UNAME_PATH"
+
     if ! grep "$PROMPT_SHELL_PATH" /etc/shells 1>/dev/null 2>&1; then
-        echo "${CLR_SUCCESS}adding updated $PROMPT_SHELL to shells...${CLR_CLEAR}"
+        $ECHO "${CLR_SUCCESS}adding updated $PROMPT_SHELL to shells...${CLR_CLEAR}"
         sudo sh -c "echo $PROMPT_SHELL_PATH >> /etc/shells"
     fi
 
     if [ "$SHELL" != "$PROMPT_SHELL_PATH" ]; then
-        echo "${CLR_SUCCESS}setting updated $PROMPT_SHELL to default shell for user...${CLR_CLEAR}"
+        $ECHO "${CLR_SUCCESS}setting updated $PROMPT_SHELL to default shell for user...${CLR_CLEAR}"
         sudo chsh -s $PROMPT_SHELL_PATH $(whoami)
 
         # set the default shell for the current session
         export SHELL="$PROMPT_SHELL_PATH"
     fi
 
-    echo "${CLR_SUCCESS}"
-    echo "##############################################################################"
-    echo "##############################################################################"
-    echo "     # \$SHELL will be $SHELL"
-    echo "     PLEASE RUN: exec -l \$SHELL"
-    echo "##############################################################################"
-    echo "##############################################################################"
-    echo "${CLR_CLEAR}"
+    $ECHO "${CLR_SUCCESS}"
+    $ECHO "##############################################################################"
+    $ECHO "##############################################################################"
+    $ECHO "     NOTE: to take advantage of the symbols used by the shell, please set"
+    $ECHO "           the terminal font to 'FiraCode Nerd Font Mono'. If you are using"
+    $ECHO "           either macOS terminal or gnome terminal, you can do this"
+    $ECHO "           automatically by loading a `theme`."
+    $ECHO
+    $ECHO "     \$SHELL will be $SHELL"
+    $ECHO "     PLEASE RUN THE FOLLOWING TO START USING THE NEW SHELL:"
+    $ECHO
+    $ECHO "     exec \$SHELL -l"
+    $ECHO "##############################################################################"
+    $ECHO "##############################################################################"
+    $ECHO "${CLR_CLEAR}"
 }
 
 __am_prompt_use_shell $@
diff --git a/src/zsh/scripts/eval/source-os b/src/zsh/scripts/eval/source-os
index 1e0d9c9..3b94465 100755
--- a/src/zsh/scripts/eval/source-os
+++ b/src/zsh/scripts/eval/source-os
@@ -2,27 +2,35 @@
 
 __am_prompt_source_os() {
 
-    local UNAME=$(uname | tr '[:upper:]' '[:lower:]')
-	local UNAME_PATH="$HOME/.am/prompt/zsh/scripts/$UNAME"
-
     if [ -f /etc/os-release ]; then
         . /etc/os-release
+        local UNAMES="$ID $ID_LIKE"
+    else
+        local UNAMES=$(uname | tr '[:upper:]' '[:lower:]')
+    fi
+
+    local UNAME=
+    until [ "$UNAME" = "$UNAMES" ]; do
+        local UNAME=${UNAMES%%' '*}
+        local UNAMES=${UNAMES#*' '}
 
-        local UNAME="$ID"
         local UNAME_PATH="$HOME/.am/prompt/zsh/scripts/$UNAME"
-    fi
 
-	if [ -d "$UNAME_PATH" ]; then
+        if [ ! -d "$UNAME_PATH" ]; then
+            continue
+        fi
+
+        export AM_PROMPT_OS=$UNAME
         export PATH="$UNAME_PATH:$PATH"
-	fi
 
-    if [ -d "$UNAME_PATH/eval" ]; then
-		for EVAL_SCRIPT in $UNAME_PATH/eval/*; do
-			. "$EVAL_SCRIPT"
-		done
-    fi
+        if [ -d "$UNAME_PATH/eval" ]; then
+            for EVAL_SCRIPT in $UNAME_PATH/eval/*; do
+                . "$EVAL_SCRIPT"
+            done
+        fi
 
-    export AM_PROMPT_OS=$UNAME
+        break
+    done
 }
 
 __am_prompt_source_os