shell: use 'command -v' instead of 'hash' (for non-bash)

see https://stackoverflow.com/a/677212

plugins/chat/tinychat_users_

@@ -19,7 +19,7 @@ room=${0##*tinychat_users_}
 ##
 if [ "$1" = "autoconf" ]; then
     # Check that curl is installed
-    if hash curl >/dev/null 2>&1; then
+    if command -v curl >/dev/null 2>&1; then
 echo "yes"
     else
 echo "no (no curl installed)"

plugins/mail/nullmailer_queue

@@ -55,7 +55,7 @@ errordir=${errordir:-/var/spool/nullmailer/failed}
 
 case $1 in
 	autoconf)
-		if hash nullmailer-queue >/dev/null 2>/dev/null; then
+		if command -v nullmailer-queue >/dev/null 2>/dev/null; then
 			[ -r "$queuedir" ] && echo yes || echo "no (queue dir not readable)"
 		else
 			echo "no (nullmailer not installed)"

plugins/network/multibandwidth

@@ -78,7 +78,7 @@ case $1 in
                 done
         exit 0;;
     autoconf)
-                if hash bing 2>/dev/null; then
+                if command -v bing >/dev/null 2>&1; then
                         echo 'yes'
                         exit 0;
                 else

plugins/rabbitmq/rabbitmq_connections

@@ -89,7 +89,7 @@ fi
 # real work - i.e. display the data. Almost always this will be
 # "value" subfield for every data field.
 
-if hash rabbitmqctl >/dev/null 2>&1; then
+if command -v rabbitmqctl >/dev/null 2>&1; then
     connections=$(HOME=/tmp rabbitmqctl list_connections state | grep -c running)
 else
     echo "$0: Could not run rabbitmqctl" >&2

plugins/reddit_karma/reddit_karma_

@@ -32,7 +32,7 @@ reddit_user=${0##*reddit_karma_}
 ##
 if [ "$1" = "autoconf" ]; then
     # Check that curl is installed
-    if hash curl >/dev/null 2>&1; then
+    if command -v curl >/dev/null 2>&1; then
         echo "yes"
     else
         echo "no (no curl installed)"