replace deprecated `...` syntax with $(...) in shell scripts

lbu.in

@@ -723,8 +723,8 @@ cmd_migrate_include_exclude() {
 #-----------------------------------------------------------
 # Main
 
-cmd=`echo "$PROGRAM" | cut -s -d_ -f2`
-PROGRAM=`echo "$PROGRAM" | cut -d_ -f1`
+cmd=$(echo "$PROGRAM" | cut -s -d_ -f2)
+PROGRAM=$(echo "$PROGRAM" | cut -d_ -f1)
 if [ -z "$cmd" ] ; then
 	cmd="$1"
 	[ -z "$cmd" ] && usage
@@ -773,7 +773,7 @@ while getopts "adehlM:np:qrv" opt ; do
 			;;
 	esac
 done
-shift `expr $OPTIND - 1`
+shift $(expr $OPTIND - 1)
 
 trap exit_clean SIGINT SIGTERM
 cmd_$SUBCMD "$@"

libalpine.sh.in

@@ -2,7 +2,7 @@
 
 PREFIX=@PREFIX@
 
-PROGRAM=`basename $0`
+PROGRAM=$(basename $0)
 
 : ${ROOT:=/}
 [ "${ROOT}" = "${ROOT%/}" ] && ROOT="${ROOT}/"
@@ -12,7 +12,7 @@ echon () {
 	if [ X"$ECHON" = X ]; then
 		# Determine how to "echo" without newline: "echo -n"
 		# or "echo ...\c"
-		if [ X`echo -n` = X-n ]; then
+		if [ X$(echo -n) = X-n ]; then
 			ECHON=echo
 			NNL="\c"
 			# "
@@ -46,8 +46,8 @@ die() {
 }
 
 init_tmpdir() {
-	local omask=`umask`
-	local __tmpd="/tmp/$PROGRAM-${$}-`date +%s`-$RANDOM"
+	local omask=$(umask)
+	local __tmpd="/tmp/$PROGRAM-${$}-$(date +%s)-$RANDOM"
 	umask 077 || die "umask"
 	mkdir -p "$__tmpd" || exit 1
 	trap "rm -fr \"$__tmpd\"; exit" 0

setup-acf.in

@@ -23,14 +23,14 @@ while getopts "ae:hl:n" opt ; do
 		*) usage;;
 	esac
 done
-shift `expr $OPTIND - 1`
+shift $(expr $OPTIND - 1)
 
 while [ $# -gt 0 ]; do
 	pkgs="$pkgs acf-$1"
 	shift
 done
 
-# install packages 
+# install packages
 apk add mini_httpd $pkgs || exit 1
 
 if [ "$create_passwd" != "no" ]; then

setup-alpine.in

@@ -46,7 +46,7 @@ while getopts "af:c:hq" opt ; do
 		*) usage;;
 	esac
 done
-shift `expr $OPTIND - 1`
+shift $(expr $OPTIND - 1)
 
 rc_sys=$(openrc --sys)
 # mount xenfs so we can detect xen dom0

setup-apkrepos.in

@@ -176,12 +176,12 @@ fi
 
 MIRRORS_PATH=/usr/share/alpine-mirrors/MIRRORS.txt
 if [ -z "$MIRRORS" ] && [ -r "$MIRRORS_PATH" ]; then
-	MIRRORS=`cat $MIRRORS_PATH`
+	MIRRORS=$(cat $MIRRORS_PATH)
 fi
 
 APKREPOS_PATH="${ROOT}"etc/apk/repositories
 if [ -r "$APKREPOS_PATH" ]; then
-	APKREPOS=`cat "$APKREPOS_PATH"`
+	APKREPOS=$(cat "$APKREPOS_PATH")
 fi
 
 get_alpine_release

setup-bootable.in

@@ -215,7 +215,7 @@ fi
 srcdir=
 # Find the srcdir or srcurl. mount loopback if needed
 if [ -f "$src"/.alpine-release ]; then
-	srcdir="`echo $src | sed -r 's,/$,,'`"
+	srcdir="$(echo $src | sed -r 's,/$,,')"
 else
 	case "$src" in
 	http://*|ftp://*) srcurl="$src";;

setup-dns.in

@@ -31,8 +31,8 @@ shift $(($OPTIND - 1))
 conf="${ROOT}etc/resolv.conf"
 
 if [ -f "$conf" ] ; then
-	domain=`awk '/^domain/ {print $2}' $conf`
-	dns=`awk '/^nameserver/ {print $2}' $conf`
+	domain=$(awk '/^domain/ {print $2}' $conf)
+	dns=$(awk '/^nameserver/ {print $2}' $conf)
 fi
 
 if [ -n "$DOMAINNAME" ];then

setup-hostname.in

@@ -57,7 +57,7 @@ fi
 
 HOST="$name"
 while [ -z "$name" ]; do
-	HOST=`hostname`
+	HOST=$(hostname)
 	echon "Enter system hostname (short form, e.g. 'foo') [$HOST]: "
 	default_read HOST "$HOST"
 	if valid_hostname "$HOST"; then

setup-interfaces.in

@@ -190,7 +190,7 @@ config_iface() {
 	done
 
 	if [ "$resp" = "yes" ]; then
-		bridge="br"`echo $iface | sed 's/[^0-9]//g'`
+		bridge="br$(echo $iface | sed 's/[^0-9]//g')"
 		ask "Name of the bridge you want add $iface to:" $bridge
 		bridge_add_port $resp $iface
 		return
@@ -261,7 +261,7 @@ config_iface() {
 	# use ipcalc -m to validate netmask. we dont accept <addr>/mask suffix
 	# so we pass on a dummy mask to ipcalc.
 	while ! ipcalc -s -m $netmask/0 >/dev/null 2>&1; do
-		netmask=`get_default_mask $address`
+		netmask=$(get_default_mask $address)
 		ask "Netmask?" $netmask
 		netmask=$resp
 		[ "$netmask" = "abort" ] && return
@@ -270,7 +270,7 @@ config_iface() {
 	# use ipcalc -m to validate netmask. we dont accept <addr>/mask suffix
 	# so we pass on a dummy mask to ipcalc.
 	while ! ipcalc -s -m $gateway/0 >/dev/null 2>&1; do
-		gateway=`get_default_gateway $iface`
+		gateway=$(get_default_gateway $iface)
 		[ -z "$gateway" ] && gateway=none
 		ask "Gateway? (or 'none')" $gateway
 		gateway=$resp
@@ -480,7 +480,7 @@ prompt_for_interfaces() {
 	hostname=$(cat $ROOT/etc/hostname 2>/dev/null)
 
 	for i in *.conf ; do
-		iface=`basename $i .conf`
+		iface=$(basename $i .conf)
 		iface=${iface#[0-9]*~}
 		bridge_ports=
 		bond_slaves=

update-conf.in

@@ -26,7 +26,7 @@ __EOF__
 
 is_modified() {
 	[ -f "$LBUCACHE" ] || lbu status -a | awk '{print $2}' > "$LBUCACHE"
-	test -n "`( echo \"$1\" ; cat \"$LBUCACHE\" ) | sort | uniq -d`"
+	test -n "$( ( echo \"$1\" ; cat \"$LBUCACHE\" ) | sort | uniq -d)"
 }
 
 
@@ -34,7 +34,7 @@ is_initd() {
 	echo "$1" | grep etc/init.d/ > /dev/null
 }
 
-args=`getopt -o ailh --long all,initd,list,help -n "$PROGRAM" -- "$@"`
+args=$(getopt -o ailh --long all,initd,list,help -n "$PROGRAM" -- "$@")
 if [ $? -ne 0 ]; then
 	usage
 	exit 2