diff --git a/pash-posix b/pash-posix
index 0f38f03..14288f8 100755
--- a/pash-posix
+++ b/pash-posix
@@ -46,12 +46,12 @@ pw_copy() {
     if [ "$TMUX" ]; then
         tmux load-buffer "$pass"
     else
-        has xclip && echo "$pass" | xclip -selection clipboard
+        hash xclip && echo "$pass" | xclip -selection clipboard
     fi
 }
 
 pw_list() {
-    if has tree; then
+    if hash tree 2>/dev/null; then
         tree --noreport
     else
         find . -mindepth 1
@@ -83,6 +83,15 @@ yn() {
     glob "$REPLY" '[yY]' || return 1 && return 0
 }
 
+glob() {
+    # This is a simple wrapper around a case
+    # statement to allow for simple string
+    # comparisons against globs.
+    #
+    # Example: if glob "Hello World" '* World'; then
+    case $1 in $2) return 0; esac; return 1
+}
+
 die() {
     printf 'error: %s\n' "$1" >&2
     exit 1
@@ -104,20 +113,12 @@ Store location:   export PASH_DIR=~/.local/share/pash
 exit 1
 }
 
-has() {
-    command -v "$1" >/dev/null 2>&1
-}
-
-glob() {
-    case $1 in $2) return 0; esac; return 1
-}
-
 main() {
     [ "$1" = '-?' ] || [ -z "$1" ] &&
         usage
 
-    has gpg  && gpg=gpg
-    has gpg2 && gpg=gpg2
+    hash gpg  2>/dev/null && gpg=gpg
+    hash gpg2 2>/dev/null && gpg=gpg2
 
     [ "$gpg" ] || die "GPG not found."