epm pack: use grep with -q

pack.d/aksusbd.sh

@@ -5,12 +5,12 @@ RETURNTARNAME="$2"
 
 . $(dirname $0)/common.sh
 
-if echo "$TAR" | grep "Sentinel_LDK_Linux_Run-time_Installer_script.tar.gz" ; then
+if echo "$TAR" | grep -q "Sentinel_LDK_Linux_Run-time_Installer_script.tar.gz" ; then
     erc $TAR || fatal
     TAR="Sentinel_LDK_Linux_Run-time_Installer_script/aksusbd-*.tar.gz"
 fi
 
-if echo "$TAR" | grep "aksusbd" ; then
+if echo "$TAR" | grep -q "aksusbd" ; then
     erc $TAR || fatal
 else
     fatal "How no idea how to handle $TAR"

pack.d/cnrdrvcups-ufr2-uk.sh

@@ -5,8 +5,8 @@ RETURNTARNAME="$2"
 
 . $(dirname $0)/common.sh
 
-if ! echo "$TAR" | grep "linux-UFRII-drv" ; then
-    fatal "How no idea how to handle $TAR"
+if ! echo "$TAR" | grep -q "linux-UFRII-drv" ; then
+    fatal "No idea how to handle $TAR"
 fi
 
 erc unpack $TAR && cd linux-* || fatal

pack.d/kyodialog.sh

@@ -5,12 +5,12 @@ RETURNTARNAME="$2"
 
 . $(dirname $0)/common.sh
 
-if echo "$TAR" | grep Linux_Universal_Driver.zip ; then
+if echo "$TAR" | grep -q Linux_Universal_Driver.zip ; then
     erc $TAR || fatal
     TAR=$(echo KyoceraLinuxPackages-*.tar.gz)
 fi
 
-if echo "$TAR" | grep KyoceraLinuxPackages ; then
+if echo "$TAR" | grep -q KyoceraLinuxPackages ; then
     erc $TAR || fatal
 else
     fatal "How no idea how to handle $TAR"

pack.d/pantum.sh

@@ -5,11 +5,11 @@ RETURNTARNAME="$2"
 
 . $(dirname $0)/common.sh
 
-if echo "$TAR" | grep "Pantum Ubuntu Driver V.*.zip" ; then
+if echo "$TAR" | grep -q "Pantum Ubuntu Driver V.*.zip" ; then
     erc "$TAR" || fatal
-elif echo "$TAR" | grep "Pantum%20Ubuntu%20Driver%20V.*.zip" ; then
+elif echo "$TAR" | grep -q "Pantum%20Ubuntu%20Driver%20V.*.zip" ; then
     erc "$TAR" || fatal
-elif echo "$TAR" | grep "linux_pantum.7z" ; then
+elif echo "$TAR" | grep -q "linux_pantum.7z" ; then
     erc "$TAR" || fatal
     return_tar linux_pantum.deb
 else