diff -ur shorewall-5.2.8.orig/shorewall/configure shorewall-5.2.8/shorewall/configure
--- shorewall-5.2.8.orig/shorewall/configure	2020-09-25 00:02:15.000000000 +0200
+++ shorewall-5.2.8/shorewall/configure	2024-05-25 17:49:28.409051456 +0200
@@ -134,7 +134,7 @@
 	*)
 	    if [ -f /etc/debian_version ]; then
 		params[HOST]=debian
-		ls -l /sbin/init | fgrep -q systemd &&  rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
+		ls -l /sbin/init | grep -F -q systemd &&  rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
 	    elif [ -f /etc/altlinux-release ] ; then
 		params[HOST]=alt
 	    elif [ -f /etc/redhat-release ]; then
@@ -163,7 +163,7 @@
     if [ $vendor = linux ]; then
 	rcfile=shorewallrc.default;
     elif [ $vendor = debian -a -f /etc/debian_version ]; then
-	ls -l /sbin/init | fgrep -q systemd && rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
+	ls -l /sbin/init | grep -F -q systemd && rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
     else
 	rcfile=shorewallrc.$vendor
     fi
diff -ur shorewall-5.2.8.orig/shorewall/lib.cli-std shorewall-5.2.8/shorewall/lib.cli-std
--- shorewall-5.2.8.orig/shorewall/lib.cli-std	2024-05-25 14:52:30.564705737 +0200
+++ shorewall-5.2.8/shorewall/lib.cli-std	2024-05-25 17:50:39.342091463 +0200
@@ -1157,7 +1157,7 @@
 			    ;;
 			t)
 			    [ $# -eq 1 ] && fatal_error "The -t option requires a timeout value"
-			    echo $2 | egrep -q '[[:digit:]]+[smh]' || fatal_error "The timeout value must be numeric, optionally followed by a suffix (s, m or h)"
+			    echo $2 | grep -E -q '[[:digit:]]+[smh]' || fatal_error "The timeout value must be numeric, optionally followed by a suffix (s, m or h)"
 			    timeout=$2
 			    option=
 			    shift;
@@ -1331,7 +1331,7 @@
 	    ;;
 	2)
 	    handle_directory $1
-	    echo $2 | egrep -q '[[:digit:]]+[smh]' || fatal_error "The timeout value must be numeric, optionally followed by a suffix (s, m or h)"
+	    echo $2 | grep -E -q '[[:digit:]]+[smh]' || fatal_error "The timeout value must be numeric, optionally followed by a suffix (s, m or h)"
 	    timeout=$2
 	    ;;
 	*)
diff -ur shorewall-5.2.8.orig/shorewall/Perl/lib.runtime shorewall-5.2.8/shorewall/Perl/lib.runtime
--- shorewall-5.2.8.orig/shorewall/Perl/lib.runtime	2024-05-25 14:52:30.564705737 +0200
+++ shorewall-5.2.8/shorewall/Perl/lib.runtime	2024-05-25 17:50:43.246148702 +0200
@@ -116,14 +116,14 @@
 # Generate a list of all network interfaces on the system
 #
 find_all_interfaces() {
-    ${IP:-ip} link list | egrep '^[[:digit:]]+:' | cut -d ' ' -f2 | sed -r 's/(@.*)?:$//'
+    ${IP:-ip} link list | grep -E '^[[:digit:]]+:' | cut -d ' ' -f2 | sed -r 's/(@.*)?:$//'
 }
 
 #
 # Generate a list of all network interfaces on the system that have an ipvX address
 #
 find_all_interfaces1() {
-    ${IP:-ip} -$g_family addr list | egrep '^[[:digit:]]+:' | cut -d ' ' -f2 | sed -r 's/(@.*)?:$//'
+    ${IP:-ip} -$g_family addr list | grep -E '^[[:digit:]]+:' | cut -d ' ' -f2 | sed -r 's/(@.*)?:$//'
 }
 
 #
@@ -679,7 +679,7 @@
     status=0
 
     if ! loopback_interface $1; then
-	if interface_is_up $1 && [ "$(find_first_interface_address_if_any $1)" != 0.0.0.0 ] && [ -z "$($IP -$g_family link list dev $1 2> /dev/null | fgrep 'state DOWN')" ]; then
+	if interface_is_up $1 && [ "$(find_first_interface_address_if_any $1)" != 0.0.0.0 ] && [ -z "$($IP -$g_family link list dev $1 2> /dev/null | grep -F 'state DOWN')" ]; then
 	    if [ "$COMMAND" != enable ]; then
 		[ ! -f ${VARDIR}/${1}_disabled ] && run_isusable_exit $1
 		status=$?
@@ -1016,7 +1016,7 @@
 		gateway="nexthop $gateway dead"
 	    fi
 
-	    if eval echo $route \| fgrep -q \'$gateway\'; then
+	    if eval echo $route \| grep -F -q \'$gateway\'; then
 		eval route=\`echo $route \| sed \'s/$gateway/ /\'\`
 		run_ip route replace table $2 $route
 	    fi
diff -ur shorewall-5.2.8.orig/shorewall/Perl/prog.footer shorewall-5.2.8/shorewall/Perl/prog.footer
--- shorewall-5.2.8.orig/shorewall/Perl/prog.footer	2020-09-24 23:46:24.000000000 +0200
+++ shorewall-5.2.8/shorewall/Perl/prog.footer	2024-05-25 17:49:42.813262647 +0200
@@ -483,7 +483,7 @@
 	    #
 	    # See what it is
 	    #
-	    if type $1 2> /dev/null | fgrep -q 'is a function'; then
+	    if type $1 2> /dev/null | grep -F -q 'is a function'; then
 		#
 		# It's a shell function -- call it
 		#
diff -ur shorewall-5.2.8.orig/shorewall/Perl/Shorewall/Chains.pm shorewall-5.2.8/shorewall/Perl/Shorewall/Chains.pm
--- shorewall-5.2.8.orig/shorewall/Perl/Shorewall/Chains.pm	2020-09-25 00:02:15.000000000 +0200
+++ shorewall-5.2.8/shorewall/Perl/Shorewall/Chains.pm	2024-05-25 17:50:54.430312682 +0200
@@ -8762,8 +8762,8 @@
 
     emit( qq(if [ -n "\$g_docker" ]; then),
 	  qq(    $tool -t nat -S DOCKER | tail -n +2 > \${VARDIR}/.nat_DOCKER),
-	  qq(    $tool -t nat -S OUTPUT | tail -n +2 | fgrep DOCKER > \${VARDIR}/.nat_OUTPUT),
-	  qq(    $tool -t nat -S POSTROUTING | tail -n +2 | fgrep -v SHOREWALL | fgrep -v LIBVIRT > \${VARDIR}/.nat_POSTROUTING),
+	  qq(    $tool -t nat -S OUTPUT | tail -n +2 | grep -F DOCKER > \${VARDIR}/.nat_OUTPUT),
+	  qq(    $tool -t nat -S POSTROUTING | tail -n +2 | grep -F -v SHOREWALL | grep -F -v LIBVIRT > \${VARDIR}/.nat_POSTROUTING),
 	  qq(    $tool -t filter -S DOCKER | tail -n +2 > \${VARDIR}/.filter_DOCKER),
 	  qq(    rm -f \${VARDIR}/.filter_DOCKER-*),
 	  qq(    [ -n "\$g_dockeringress"  ] && $tool -t filter -S DOCKER-INGRESS   | tail -n +2 > \${VARDIR}/.filter_DOCKER-INGRESS),
@@ -8780,7 +8780,7 @@
     if ( known_interface( $bridge ) ) {
 	emit( qq(    $tool -t filter -S FORWARD | grep '^-A FORWARD.*[io] br-[a-z0-9]\\{12\\}' > \${VARDIR}/.filter_FORWARD) );
     } else {
-	emit( qq(    $tool -t filter -S FORWARD | egrep '^-A FORWARD.*[io] ($bridge|br-[a-z0-9]{12})' > \${VARDIR}/.filter_FORWARD) );
+	emit( qq(    $tool -t filter -S FORWARD | grep -E '^-A FORWARD.*[io] ($bridge|br-[a-z0-9]{12})' > \${VARDIR}/.filter_FORWARD) );
     }
 
     emit( q(    [ -s ${VARDIR}/.filter_FORWARD ] || rm -f ${VARDIR}/.filter_FORWARD),
@@ -8825,7 +8825,7 @@
 fi
 
 if chain_exists dynamic; then
-    $tool -S dynamic | tail -n +2 | fgrep -v -- '-j ACCEPT' > \${VARDIR}/.dynamic
+    $tool -S dynamic | tail -n +2 | grep -F -v -- '-j ACCEPT' > \${VARDIR}/.dynamic
 else
     rm -f \${VARDIR}/.dynamic
 fi
diff -ur shorewall-5.2.8.orig/shorewall/Perl/Shorewall/Config.pm shorewall-5.2.8/shorewall/Perl/Shorewall/Config.pm
--- shorewall-5.2.8.orig/shorewall/Perl/Shorewall/Config.pm	2024-05-25 14:52:30.560705678 +0200
+++ shorewall-5.2.8/shorewall/Perl/Shorewall/Config.pm	2024-05-25 17:50:46.862201722 +0200
@@ -5059,7 +5059,7 @@
 }
 
 sub Basic_Ematch() {
-    $tc && have_capability( 'BASIC_FILTER' ) && system( "$tc filter add basic help 2>&1 | egrep -q match" ) == 0;
+    $tc && have_capability( 'BASIC_FILTER' ) && system( "$tc filter add basic help 2>&1 | grep -E -q match" ) == 0;
 }
 
 sub Fwmark_Rt_Mask() {
diff -ur shorewall-5.2.8.orig/shorewall/Perl/Shorewall/Misc.pm shorewall-5.2.8/shorewall/Perl/Shorewall/Misc.pm
--- shorewall-5.2.8.orig/shorewall/Perl/Shorewall/Misc.pm	2020-09-25 00:02:15.000000000 +0200
+++ shorewall-5.2.8/shorewall/Perl/Shorewall/Misc.pm	2024-05-25 17:50:08.705642277 +0200
@@ -2559,7 +2559,7 @@
     case $COMMAND in
         stop|clear|restore)
             if chain_exists dynamic; then
-                ${IPTABLES}-save -t filter | grep '^-A dynamic' | fgrep -v -- '-j ACCEPT' > ${VARDIR}/.dynamic
+                ${IPTABLES}-save -t filter | grep '^-A dynamic' | grep -F -v -- '-j ACCEPT' > ${VARDIR}/.dynamic
             fi
             ;;
         *)
@@ -2574,7 +2574,7 @@
     case $COMMAND in
         stop|clear|restore)
             if chain_exists dynamic; then
-                ${IP6TABLES}-save -t filter | grep '^-A dynamic' | fgrep -v -- '-j ACCEPT' > ${VARDIR}/.dynamic
+                ${IP6TABLES}-save -t filter | grep '^-A dynamic' | grep -F -v -- '-j ACCEPT' > ${VARDIR}/.dynamic
             fi
             ;;
         *)
diff -ur shorewall-5.2.8.orig/shorewall/Perl/Shorewall/Proc.pm shorewall-5.2.8/shorewall/Perl/Shorewall/Proc.pm
--- shorewall-5.2.8.orig/shorewall/Perl/Shorewall/Proc.pm	2020-09-25 00:02:15.000000000 +0200
+++ shorewall-5.2.8/shorewall/Perl/Shorewall/Proc.pm	2024-05-25 17:49:51.965396834 +0200
@@ -364,7 +364,7 @@
 
 	    emit( "    setting=$setting",
 		  '',
-		  "    fgrep -q $setting /proc/net/netfilter/nf_log || setting=$alternative",
+		  "    grep -F -q $setting /proc/net/netfilter/nf_log || setting=$alternative",
 		  '',
 		  "    if echo \$setting > $file; then",
 		  '       progress_message "Log Backend set to $setting"',
diff -ur shorewall-5.2.8.orig/shorewall/Perl/Shorewall/Providers.pm shorewall-5.2.8/shorewall/Perl/Shorewall/Providers.pm
--- shorewall-5.2.8.orig/shorewall/Perl/Shorewall/Providers.pm	2020-09-25 00:02:15.000000000 +0200
+++ shorewall-5.2.8/shorewall/Perl/Shorewall/Providers.pm	2024-05-25 17:50:51.250266058 +0200
@@ -1061,7 +1061,7 @@
     }
 
     emit( qq(\n) ,
-	  qq(if ! \$IP -6 rule ls | egrep -q "32767:[[:space:]]+from all lookup (default|253)"; then) ,
+	  qq(if ! \$IP -6 rule ls | grep -E -q "32767:[[:space:]]+from all lookup (default|253)"; then) ,
 	  qq(    qt \$IP -6 rule add from all table $providers{default}->{id} prio 32767\n) ,
 	  qq(fi) ) if $family == F_IPV6;
 
@@ -1078,7 +1078,7 @@
 	} elsif ( ! $noautosrc ) {
 	    if ( $shared ) {
 		if ( $persistent ) {
-		    emit( qq(if ! egrep -q "^20000:[[:space:]]+from $address lookup $id"; then),
+		    emit( qq(if ! grep -E -q "^20000:[[:space:]]+from $address lookup $id"; then),
 			  qq(    qt \$IP -$family rule del from $address pref 20000),
 			  qq(    run_ip rule add from $address pref 20000 table $id),
 			  qq(    echo "\$IP -$family rule del from $address pref 20000> /dev/null 2>&1" >> \${VARDIR}/undo_${table}_routing ),
diff -ur shorewall-5.2.8.orig/shorewall6/configure shorewall-5.2.8/shorewall6/configure
--- shorewall-5.2.8.orig/shorewall6/configure	2020-09-25 00:02:16.000000000 +0200
+++ shorewall-5.2.8/shorewall6/configure	2024-05-25 17:48:41.736367147 +0200
@@ -134,7 +134,7 @@
 	*)
 	    if [ -f /etc/debian_version ]; then
 		params[HOST]=debian
-		ls -l /sbin/init | fgrep -q systemd &&  rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
+		ls -l /sbin/init | grep -F -q systemd &&  rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
 	    elif [ -f /etc/altlinux-release ] ; then
 		params[HOST]=alt
 	    elif [ -f /etc/redhat-release ]; then
@@ -163,7 +163,7 @@
     if [ $vendor = linux ]; then
 	rcfile=shorewallrc.default;
     elif [ $vendor = debian -a -f /etc/debian_version ]; then
-	ls -l /sbin/init | fgrep -q systemd && rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
+	ls -l /sbin/init | grep -F -q systemd && rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
     else
 	rcfile=shorewallrc.$vendor
     fi
diff -ur shorewall-5.2.8.orig/shorewall6-lite/configure shorewall-5.2.8/shorewall6-lite/configure
--- shorewall-5.2.8.orig/shorewall6-lite/configure	2020-09-25 00:02:16.000000000 +0200
+++ shorewall-5.2.8/shorewall6-lite/configure	2024-05-25 17:49:23.932985828 +0200
@@ -134,7 +134,7 @@
 	*)
 	    if [ -f /etc/debian_version ]; then
 		params[HOST]=debian
-		ls -l /sbin/init | fgrep -q systemd &&  rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
+		ls -l /sbin/init | grep -F -q systemd &&  rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
 	    elif [ -f /etc/altlinux-release ] ; then
 		params[HOST]=alt
 	    elif [ -f /etc/redhat-release ]; then
@@ -163,7 +163,7 @@
     if [ $vendor = linux ]; then
 	rcfile=shorewallrc.default;
     elif [ $vendor = debian -a -f /etc/debian_version ]; then
-	ls -l /sbin/init | fgrep -q systemd && rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
+	ls -l /sbin/init | grep -F -q systemd && rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
     else
 	rcfile=shorewallrc.$vendor
     fi
diff -ur shorewall-5.2.8.orig/shorewall-core/configure shorewall-5.2.8/shorewall-core/configure
--- shorewall-5.2.8.orig/shorewall-core/configure	2020-09-25 00:02:15.000000000 +0200
+++ shorewall-5.2.8/shorewall-core/configure	2024-05-25 17:49:13.276829586 +0200
@@ -134,7 +134,7 @@
 	*)
 	    if [ -f /etc/debian_version ]; then
 		params[HOST]=debian
-		ls -l /sbin/init | fgrep -q systemd &&  rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
+		ls -l /sbin/init | grep -F -q systemd &&  rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
 	    elif [ -f /etc/altlinux-release ] ; then
 		params[HOST]=alt
 	    elif [ -f /etc/redhat-release ]; then
@@ -163,7 +163,7 @@
     if [ $vendor = linux ]; then
 	rcfile=shorewallrc.default;
     elif [ $vendor = debian -a -f /etc/debian_version ]; then
-	ls -l /sbin/init | fgrep -q systemd && rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
+	ls -l /sbin/init | grep -F -q systemd && rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
     else
 	rcfile=shorewallrc.$vendor
     fi
diff -ur shorewall-5.2.8.orig/shorewall-core/lib.cli shorewall-5.2.8/shorewall-core/lib.cli
--- shorewall-5.2.8.orig/shorewall-core/lib.cli	2024-05-25 14:52:30.564705737 +0200
+++ shorewall-5.2.8/shorewall-core/lib.cli	2024-05-25 17:50:34.890026189 +0200
@@ -252,7 +252,7 @@
 
     qt tc -s filter ls root dev $1 && tc -s filter ls root dev $device | grep -v '^$'
     tc filter show dev $1
-    tc class show dev $1 | fgrep 'leaf ' | fgrep -v ' hfsc' | sed 's/^.*leaf //;s/ .*//' | while read class; do
+    tc class show dev $1 | grep -F 'leaf ' | grep -F -v ' hfsc' | sed 's/^.*leaf //;s/ .*//' | while read class; do
 	if [ -n "$class" ]; then
 	    echo
 	    echo Node $class
@@ -426,7 +426,7 @@
 savesets() {
     local supported
 
-    supported=$(run_it $g_firewall help | fgrep savesets )
+    supported=$(run_it $g_firewall help | grep -F savesets )
 
     [ -n "$supported" ] && run_it $g_firewall savesets ${g_restorepath}-ipsets 
 }
@@ -437,7 +437,7 @@
 savesets1() {
     local supported
 
-    supported=$(run_it $g_firewall help | fgrep savesets )
+    supported=$(run_it $g_firewall help | grep -F savesets )
 
     [ -n "$supported" ] && run_it $g_firewall savesets ${VARDIR}/ipsets.save && progress_message3 "The ipsets have been saved to ${VARDIR}/ipsets.save"
 }
@@ -696,7 +696,7 @@
     local junk
     local setname
 
-    $IPSETN -L | egrep "^Name: ${1}(_.+)?$" | while read junk setname; do echo $setname; done
+    $IPSETN -L | grep -E "^Name: ${1}(_.+)?$" | while read junk setname; do echo $setname; done
 }
 
 list_zone() {
@@ -707,9 +707,9 @@
     determine_ipset_version
 
     if [ $g_family -eq 4 ]; then
-	sets=$($IPSETN -L | egrep "^$1(_.+)?");
+	sets=$($IPSETN -L | grep -E "^$1(_.+)?");
      else
-	sets=$($IPSETN -L | egrep "^6_$1(_.+)?")
+	sets=$($IPSETN -L | grep -E "^6_$1(_.+)?")
     fi
 
     [ -n "$sets" ] || sets=$(find_sets $1)
@@ -1207,7 +1207,7 @@
     $IP -s -$g_family xfrm policy | spd_filter
 
     heading "PFKEY SAD"
-    $IP -s -$g_family xfrm state | egrep -v '[[:space:]]+(auth-trunc|enc )' # Don't divulge the keys
+    $IP -s -$g_family xfrm state | grep -E -v '[[:space:]]+(auth-trunc|enc )' # Don't divulge the keys
 }
 
 show_ipsec_command() {
@@ -1533,7 +1533,7 @@
 	    if chain_exists dynamic; then
 		g_ipt_options="$g_ipt_options --line-numbers"
 		$g_tool -t filter -L dynamic $g_ipt_options  | head -n2
-		$g_tool -t filter -L dynamic $g_ipt_options  | fgrep ACCEPT | $output_filter
+		$g_tool -t filter -L dynamic $g_ipt_options  | grep -F ACCEPT | $output_filter
 	    fi
 	    ;;
 	ipsec)
@@ -1625,7 +1625,7 @@
 
 	if [ -n "$hnames" ]; then
 	    for hname in $hnames; do
-		iptaccount -l $hname | egrep '^IP:|^Show'
+		iptaccount -l $hname | grep -E '^IP:|^Show'
 		echo
 	    done
 	else
@@ -3253,7 +3253,7 @@
 
 	if $TC filter add basic help 2>&1 | grep -q ^Usage; then
 	    BASIC_FILTER=Yes
-	    $TC filter add basic help 2>&1 | egrep -q match && BASIC_EMATCH=Yes
+	    $TC filter add basic help 2>&1 | grep -E -q match && BASIC_EMATCH=Yes
 	fi
 
 	if $TC action add connmark help 2>&1 | grep -q ^Usage; then
@@ -3674,7 +3674,7 @@
     if [ $COMMAND = 'blacklist!' ]; then
 	timeout='timeout 0'
     else
-	echo "$@" | fgrep -q ' timeout ' || timeout="timeout $g_dbltimeout"
+	echo "$@" | grep -F -q ' timeout ' || timeout="timeout $g_dbltimeout"
     fi
 
     if $IPSET -A $g_blacklistipset $@ $timeout -exist; then
@@ -4932,12 +4932,12 @@
 		#
 		# First look for it here
 		#
-		if type $1 2> /dev/null | fgrep -q 'is a function'; then
+		if type $1 2> /dev/null | grep -F -q 'is a function'; then
 		    #
 		    # It's a shell function -- call it
 		    #
 		    $@
-		elif type $1 2> /dev/null | fgrep -q 'is a shell function'; then
+		elif type $1 2> /dev/null | grep -F -q 'is a shell function'; then
 		    #
 		    # It's a shell function -- call it
 		    #
diff -ur shorewall-5.2.8.orig/shorewall-core/lib.common shorewall-5.2.8/shorewall-core/lib.common
--- shorewall-5.2.8.orig/shorewall-core/lib.common	2024-05-25 14:52:30.564705737 +0200
+++ shorewall-5.2.8/shorewall-core/lib.common	2024-05-25 17:49:09.004766950 +0200
@@ -639,7 +639,7 @@
 #Determines if the passed interface is a loopback interface
 #
 loopback_interface() { #$1 = Interface name
-    [ "$1" = lo ] || $IP link show $1 | fgrep -q LOOPBACK
+    [ "$1" = lo ] || $IP link show $1 | grep -F -q LOOPBACK
 }
 
 #
@@ -648,7 +648,7 @@
 find_loopback_interfaces() {
     local interfaces
 
-    [ -x "$IP" ] && interfaces=$($IP link show | fgrep LOOPBACK | sed 's/://g' | cut -d ' ' -f 2)
+    [ -x "$IP" ] && interfaces=$($IP link show | grep -F LOOPBACK | sed 's/://g' | cut -d ' ' -f 2)
 
     [ -n "$interfaces" ] && echo $interfaces || echo lo
 }
diff -ur shorewall-5.2.8.orig/shorewall-init/configure shorewall-5.2.8/shorewall-init/configure
--- shorewall-5.2.8.orig/shorewall-init/configure	2020-09-25 00:02:16.000000000 +0200
+++ shorewall-5.2.8/shorewall-init/configure	2024-05-25 17:48:10.515909400 +0200
@@ -134,7 +134,7 @@
 	*)
 	    if [ -f /etc/debian_version ]; then
 		params[HOST]=debian
-		ls -l /sbin/init | fgrep -q systemd &&  rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
+		ls -l /sbin/init | grep -F -q systemd &&  rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
 	    elif [ -f /etc/altlinux-release ] ; then
 		params[HOST]=alt
 	    elif [ -f /etc/redhat-release ]; then
@@ -163,7 +163,7 @@
     if [ $vendor = linux ]; then
 	rcfile=shorewallrc.default;
     elif [ $vendor = debian -a -f /etc/debian_version ]; then
-	ls -l /sbin/init | fgrep -q systemd && rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
+	ls -l /sbin/init | grep -F -q systemd && rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
     else
 	rcfile=shorewallrc.$vendor
     fi
diff -ur shorewall-5.2.8.orig/shorewall-lite/configure shorewall-5.2.8/shorewall-lite/configure
--- shorewall-5.2.8.orig/shorewall-lite/configure	2020-09-25 00:02:16.000000000 +0200
+++ shorewall-5.2.8/shorewall-lite/configure	2024-05-25 17:49:17.420890348 +0200
@@ -134,7 +134,7 @@
 	*)
 	    if [ -f /etc/debian_version ]; then
 		params[HOST]=debian
-		ls -l /sbin/init | fgrep -q systemd &&  rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
+		ls -l /sbin/init | grep -F -q systemd &&  rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
 	    elif [ -f /etc/altlinux-release ] ; then
 		params[HOST]=alt
 	    elif [ -f /etc/redhat-release ]; then
@@ -163,7 +163,7 @@
     if [ $vendor = linux ]; then
 	rcfile=shorewallrc.default;
     elif [ $vendor = debian -a -f /etc/debian_version ]; then
-	ls -l /sbin/init | fgrep -q systemd && rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
+	ls -l /sbin/init | grep -F -q systemd && rcfile=shorewallrc.debian.systemd || rcfile=shorewallrc.debian.sysvinit
     else
 	rcfile=shorewallrc.$vendor
     fi