diff --git a/libexec/portzap/setup/setup-doas b/libexec/portzap/setup/setup-doas
index 0808e48..5701815 100644
--- a/libexec/portzap/setup/setup-doas
+++ b/libexec/portzap/setup/setup-doas
@@ -18,7 +18,7 @@ src="${sharedir}"/doas.conf
 dest="${localbase}"/etc/doas.conf
 cat "${src}" |
 while read -r line; do
-    if grep "${line}" "${dest}" > /dev/null 2>&1; then
+    if grep -q "${line}" "${dest}"; then
         continue
     fi
     cat "${src}" >> "${dest}"
diff --git a/libexec/portzap/utils/isportzap-member b/libexec/portzap/utils/isportzap-member
index 593e357..39dabac 100644
--- a/libexec/portzap/utils/isportzap-member
+++ b/libexec/portzap/utils/isportzap-member
@@ -5,5 +5,5 @@ set -e
 # main
 group="_portzap"
 mygroups=$(id -Gn | tr ' ' '\n')
-echo "${mygroups}" | grep -e "^${group}$" > /dev/null 2>&1
+echo "${mygroups}" | grep -qe "^${group}$"
 exit "${?}"