Use replace non-standard egrep/fgrep with grep `-E/-F`

key-rotation.sh

@@ -14,5 +14,5 @@ rotation_needed() {
 }
 
 [ "$(rotation_needed)" = true ] || exit 0
-sv status dnscrypt-wrapper | egrep -q '^run:' || exit 0
+sv status dnscrypt-wrapper | grep -E -q '^run:' || exit 0
 sv restart dnscrypt-wrapper

unbound.sh

@@ -4,7 +4,7 @@ KEYS_DIR="/opt/dnscrypt-wrapper/etc/keys"
 ZONES_DIR="/opt/unbound/etc/unbound/zones"
 
 reserved=12582912
-availableMemory=$((1024 * $( (fgrep MemAvailable /proc/meminfo || fgrep MemTotal /proc/meminfo) | sed 's/[^0-9]//g' ) ))
+availableMemory=$((1024 * $( (grep -F MemAvailable /proc/meminfo || grep -F MemTotal /proc/meminfo) | sed 's/[^0-9]//g' ) ))
 if [ $availableMemory -le $((reserved * 2)) ]; then
     echo "Not enough memory" >&2
     exit 1