Make gshuf alias checker work on other bash versions
diff --git a/aliases/available/general.aliases.bash b/aliases/available/general.aliases.bash
index 74f5428..4f49a6a 100644
--- a/aliases/available/general.aliases.bash
+++ b/aliases/available/general.aliases.bash
@@ -14,8 +14,8 @@
 then
   alias ls="ls --color=always"
 fi
-
-if [ ! -z "$(which gshuf)" ]
+which gshuf &> /dev/null
+if [ $? -eq 1 ]
 then
   alias shuf=gshuf
 fi