diff --git a/tools/bgpscanner/bgpscanner b/tools/bgpscanner/bgpscanner
index f841562..b91f201 100755
--- a/tools/bgpscanner/bgpscanner
+++ b/tools/bgpscanner/bgpscanner
@@ -106,7 +106,7 @@ chkint() {
 }
 isip4() {
     for i in 1 2 3 4; do
-        case $(echo "$1" | cut -d. -f"$i") in
+        case $(printf %s\\n "$1" | cut -d. -f"$i") in
         [0-9]|[0-9][0-9]|[0-1][0-9][0-9]|2[0-4][0-9]|25[0-5]) ;;
         *) return 1;;
         esac
@@ -114,7 +114,7 @@ isip4() {
 }
 isip6() {
     test "$( \
-        echo "$1" | \
+        printf %s\\n "$1" | \
         grep -Ec '^(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]).){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]).){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))$' \
     )" -eq 1
 }
@@ -165,22 +165,22 @@ templatef() {
         [ -n "$2" ] && "$2" "$UNQ"
         [ $? -ne 0 ] && exit 1
 
-        echo "$UNQ"
+        printf %s\\n "$UNQ"
     done > "$TPL" || die "'$1': File conversion failed"
 
     echo "$TPL"
 }
 
-append() {
-    echo "${1:+${1}${3:+ ${3}} }${2}"
-}
+quote () { printf %s\\n "$1" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/'/"; }
+
+append() { printf %s\\n "${1:+${1}${3:+ ${3}} }${2}"; }
 
 TERM=""
 EXPR=""
 
 appendtermargs() {
     _T=$1; shift
-    TERM="$_T ( $* )"
+    TERM="$_T \( $* \)"
 }
 
 appendtermfiles() {
@@ -188,7 +188,7 @@ appendtermfiles() {
 
     for i in "$@"; do _L=$(append "$_L" "$_T $i" "-or"); done
 
-    [ -n "$TERM" ] && TERM="( $TERM -or $_L )" || TERM="$_L"
+    [ -n "$TERM" ] && TERM="\( $TERM -or $_L \)" || TERM="$_L"
 }
 
 pushterm() {
@@ -201,12 +201,12 @@ exprcompile() {
     pushterm
 
     for i in $ATTRS; do TERM=$(append "$TERM" "-attr $i" "-or"); done
-    [ "$(echo "$ATTRS" | wc -w)" -gt 1 ] && TERM="( $TERM )"
+    [ "$(echo "$ATTRS" | wc -w)" -gt 1 ] && TERM="\( $TERM \)"
     pushterm
 
-    [ -n "$NCOMMS" ] && TERM="-not -communities ( $NCOMMS )"
-    [ -n "$COMMS" ] && TERM=$(append "$TERM" "-all-communities ( $COMMS )" "-or")
-    [ -n "$NCOMMS" ] && [ -n "$COMMS" ] && TERM="( $TERM )"
+    [ -n "$NCOMMS" ] && TERM="-not -communities \( $NCOMMS \)"
+    [ -n "$COMMS" ] && TERM=$(append "$TERM" "-all-communities \( $COMMS \)" "-or")
+    [ -n "$NCOMMS" ] && [ -n "$COMMS" ] && TERM="\( $TERM \)"
     pushterm
 
     [ -n "$EXACT" ] && appendtermargs -exact $EXACT
@@ -229,10 +229,15 @@ exprcompile() {
 
     [ -n "$REXPS" ] && TERM="-aspath \"$REXPS\""
     [ -n "$NREXPS" ] && TERM=$(append "$TERM" "-not -aspath \"$NREXPS\"" "-or")
-    [ -n "$REXPS" ] && [ -n "$NREXPS" ] && TERM="( $TERM )"
+    [ -n "$REXPS" ] && [ -n "$NREXPS" ] && TERM="\( $TERM \)"
     pushterm
 }
 
+execute() {
+    eval "set -- $OPTS -- "$@" $EXPR"
+    "$CMD" "$TGT" "$@"
+}
+
 GOTEXACT=""; GOTRELATED=""; GOTSUBNETS=""; GOTSUPNETS=""
 while getopts "a:A:cde:E:fi:I:lLo:m:M:p:P:r:R:s:S:t:T:u:U:" o; do
     case $o in
@@ -273,10 +278,10 @@ while getopts "a:A:cde:E:fi:I:lLo:m:M:p:P:r:R:s:S:t:T:u:U:" o; do
     o) OUTREDIR="$OPTARG"
        ;;
     p) chkrexp "$OPTARG"
-       REXPS=$(append "$REXPS" "$(echo "$OPTARG" | tr "?" ".")" "|")
+       REXPS=$(append "$REXPS" "$(printf %s\\n "$OPTARG" | tr "?" ".")" "|")
        ;;
     P) chkrexp "$OPTARG"
-       NREXPS=$(append "$NREXPS" "$(echo "$OPTARG" | tr "?" "." )" "|")
+       NREXPS=$(append "$NREXPS" "$(printf %s\\n "$OPTARG" | tr "?" "." )" "|")
        ;;
     r) chkprefix "$OPTARG"
        GOTRELATED=y; RELATED=$(append "$RELATED" "$OPTARG")
@@ -321,6 +326,9 @@ exprcompile
 [ -n "$OUTREDIR" ] && OPTS=$(append "$OPTS" "-o $OUTREDIR")
 
 CMD="exec"
-[ -n "$PRETEND" ] && [ "$PRETEND" = 1 ] || [ "$PRETEND" = y ] || [ "$PRETEND" = yes ] && CMD="echo"
+if [ -n "$PRETEND" ] && [ "$PRETEND" = 1 ] || [ "$PRETEND" = y ] || [ "$PRETEND" = yes ]; then
+    CMD="echo"
+    EXPR=$(quote "$EXPR")
+fi
 
-"$CMD" "$TGT" $OPTS -- "$@" $EXPR
+execute "$@"