diff --git a/src/fsh.nim b/src/fsh.nim
index 624ed69..9b90010 100644
--- a/src/fsh.nim
+++ b/src/fsh.nim
@@ -31,11 +31,35 @@ type
     line: int
     col: int
     whileExec: string
-  ShellVariableError=object of ShellError
+  ShellVariableError= object of ShellError
     variable: string
   ShellCommandError = object of ShellError
     command: string
 
+# procs for making procedures
+proc newShellException(msg: string, line=0, col=0, whileExec=""): ref ShellError =
+  var e = newException(ShellError, msg)
+  e.line=line
+  e.col=col
+  e.whileExec = whileExec
+  return e
+
+proc newShellVariableException(msg: string, vari: string, line=0, col=0, whileExec=""): ref ShellVariableError =
+  var e= newException(ShellVariableError, msg)
+  e.variable =vari
+  e.line=line
+  e.col=col
+  e.whileExec=whileExec
+  return e
+
+proc newShellCommandException(msg: string, command: string, line=0, col=0, whileExec=""): ref ShellCommandError =
+  var e=newException(ShellCommandError, msg)
+  e.command=command
+  e.line=line
+  e.col=col
+  e.whileExec=whileExec
+  return e
+
 # forward declarations
 proc eval(cmd: string): string
 proc substitute(strm: Stream, delim = ";\p"): string