misc: .screenrc, config, functions & new scripts!

config/functions

@@ -66,6 +66,23 @@ function silent
   "$@" >&/dev/null
 }
 
+function path_remove
+{
+  PATH=$(echo -n "$PATH" | awk -v RS=: -v ORS=: "\$0 != \"$1\"" | sed 's/:$//')
+}
+
+function path_append
+{
+  path_remove "$1"
+  PATH="${PATH:+"$PATH:"}$1"
+}
+
+function path_prepend
+{
+  path_remove "$1"
+  PATH="$1${PATH:+":$PATH"}"
+}
+
 # Defines default antigen bundles
 function x-default-antigen-bundles
 {