Merge pull request #4890 from dokku/drop-which

Drop which in favor of command -v

plugins/nginx-vhosts/dependencies

@@ -7,7 +7,7 @@ nginx_needs_upgrade() {
   local MAJOR_VERSION MINOR_VERSION
   local NEEDS_UPGRADE=true
 
-  if ! which nginx >/dev/null 2>&1; then
+  if ! command -v nginx &>/dev/null; then
     echo $NEEDS_UPGRADE
     return
   fi
@@ -45,7 +45,7 @@ trigger-nginx-vhosts-dependencies() {
         return
       fi
 
-      if ! which nginx >/dev/null 2>&1; then
+      if ! command -v nginx &>/dev/null; then
         nginx_install
         return
       fi

plugins/nginx-vhosts/internal-functions

@@ -75,7 +75,7 @@ fn-nginx-vhosts-nginx-location() {
   declare desc="check that nginx is at the expected location and return it"
   local NGINX_LOCATION
 
-  NGINX_LOCATION=$(which nginx 2>/dev/null)
+  NGINX_LOCATION=$(command -v nginx 2>/dev/null)
   if [[ -z "$NGINX_LOCATION" ]]; then
     NGINX_LOCATION="/usr/sbin/nginx"
   fi