now shrc can be invoked as a script

shrc

@@ -1,13 +1,7 @@
-#!/bin/bash
+#!/bin/sh
 
 # TODO: use tput
 
-# If not running interactively, don't do anything
-alias isinteractive=false
-expr "$-" : '^.*i' >/dev/null  && alias isinteractive=true
-
-isinteractive || return
-
 ##########################################
 null(){
     "$@" >/dev/null 2>&1
@@ -17,11 +11,16 @@ __try_exec(){
 }
 
 __match(){
-    # __match str1 str2
-    # return 0 if str2 is found in str1
+    # __match str word
+    # return 0 if word is found in str
     expr "$1" : ".*$2.*" >/dev/null
 }
 
+alias isinteractive=false
+__match "$-" i >/dev/null  && alias isinteractive=true
+alias issourced=true
+expr "$0" : "^.*shrc$" >/dev/null && alias issourced=false # invoked as script
+
 ##########################
 # system type
 
@@ -55,6 +54,18 @@ fi
 
 #################################
 
+if inbash
+then
+    shrc="$BASH_SOURCE"
+elif inzsh
+then
+    shrc="$0"
+fi
+
+dotdir="`dirname "$shrc"`"
+
+#################################
+
 alias firstload=false
 __match "$PATH" "$HOME/.local/bin" || alias firstload=true
 
@@ -175,6 +186,10 @@ fi
 
 #######################
 
+# If not running interactively, don't do anything
+issourced || exit
+isinteractive || return
+
 iswindows && alias tty="echo cmd.exe"
 type fortune >/dev/null 2>&1 && {
     fortune