Consolidate grep text searching predicates to use "grep -qs"

If this is deemed not portable enough in the future, it should be easy
enough to find/replace.

Signed-off-by: Chris Lamb <chris@chris-lamb.co.uk>

helpers/lh_binary_local-includes

@@ -42,7 +42,7 @@ Check_lockfile .lock
 # Creating lock file
 Create_lockfile .lock
 
-if ls -A config/binary_local-includes/ | grep . > /dev/null 2>&1
+if ls -A config/binary_local-includes/ | grep -qs .
 then
 	# Copying includes
 	cd config/binary_local-includes

helpers/lh_binary_net

@@ -78,7 +78,7 @@ case "${LH_NET_TARBALL}" in
 		;;
 
 	gzip)
-		if gzip --help | grep -q "\-\-rsyncable"
+		if gzip --help | grep -qs "\-\-rsyncable"
 		then
 			tar cf binary-net.tar "$(basename ${OLDPWD})/${ROOT_DIR}" "$(basename ${OLDPWD})/tftpboot"
 			gzip --rsyncable --best binary-net.tar

helpers/lh_binary_syslinux

@@ -280,7 +280,7 @@ Configure_syslinux_templates ()
 	# Syslinux v3.31 in etch does not support include statements
 	if [ "${LH_DISTRIBUTION}" = "etch" ]
 	then
-		while grep -q ^include ${SCREEN_PATH}/syslinux.cfg
+		while grep -qs ^include ${SCREEN_PATH}/syslinux.cfg
 		do
 			INCLUDES=$(grep ^include ${SCREEN_PATH}/syslinux.cfg |awk '{print $2}')
 

helpers/lh_binary_tar

@@ -50,7 +50,7 @@ Create_lockfile .lock
 # Remove old binary
 rm -f binary.tar.gz
 
-if gzip --help | grep -q '\-\-rsyncable'
+if gzip --help | grep -qs '\-\-rsyncable'
 then
 	tar cf binary-tar.tar binary
 	gzip --rsyncable --best binary-tar.tar

helpers/lh_chroot_local-includes

@@ -42,7 +42,7 @@ Check_lockfile .lock
 # Creating lock file
 Create_lockfile .lock
 
-if ls -A config/chroot_local-includes/ | grep . > /dev/null 2>&1
+if ls -A config/chroot_local-includes/ | grep -qs .
 then
 	# Copying includes
 	cd config/chroot_local-includes

helpers/lh_source_debian-live

@@ -60,7 +60,7 @@ cp -a config source/debian-live
 # Create tarball
 cd source
 
-if gzip --help | grep -q '\-\-rsyncable'
+if gzip --help | grep -qs '\-\-rsyncable'
 then
 	tar cf debian-live-config_$(date +%Y%m%d.%s).tar debian-live
 	gzip --rsyncable --best debian-live-config_$(date +%Y%m%d.%s).tar

helpers/lh_source_net

@@ -59,7 +59,7 @@ then
 fi
 
 # Create tarball
-if gzip --help | grep -q '\-\-rsyncable'
+if gzip --help | grep -qs '\-\-rsyncable'
 then
 	tar cf source-net.tar source
 	gzip --rsyncable --best source-net.tar

helpers/lh_source_tar

@@ -60,7 +60,7 @@ then
 fi
 
 # Create tarball
-if gzip --help | grep -q '\-\-rsyncable'
+if gzip --help | grep -qs '\-\-rsyncable'
 then
 	tar cf source.tar source
 	gzip --rsyncable --best source.tar