zshrc: add the islinux() test before testing for ls -v switch

See https://github.com/grml/grml-etc-core/pull/55#issuecomment-171782089

diff --git a/etc/zsh/zshrc b/etc/zsh/zshrc
index afcb5b7..9040369 100644 (file)
--- a/etc/zsh/zshrc
+++ b/etc/zsh/zshrc
@@ -441,7 +441,8 @@ elif ls -G / >/dev/null 2>&1; then
 fi
 
 # Natural sorting order on GNU ls(1)
-if ls -v / >/dev/null 2>&1; then
+# OSX and IllumOS have a -v option that is not natural sorting
+if islinux && ls -v / >/dev/null 2>&1; then
     ls_options+=( -v )
 fi