diff --git a/README.md b/README.md
index 33611ba..1c6c0b0 100644
--- a/README.md
+++ b/README.md
@@ -116,7 +116,7 @@ server-xray <server-options>
     -r|--request-domain <domain-name>     Domain name to request for letsencrypt cert
     -c|--cert-home <cert-home-dir>        Reading TLS certs from folder <cert-home-dir>/<domain-name>/
     -i|--stdin                            Read config from STDIN instead of auto generation
-    -j|--json                             Json snippet to merge into the config. Say '{log:{loglevel:info}}'
+    -j|--json                             Json snippet to merge into the config. Say '{"log":{"loglevel":"info"}}'
     -d|--debug                            Start in debug mode with verbose output
 ```
 
diff --git a/run.sh b/run.sh
index dacfb97..b8c2bce 100755
--- a/run.sh
+++ b/run.sh
@@ -1,7 +1,6 @@
 #!/bin/bash
 
 DIR=$(dirname $0)
-DIR="$(cd $DIR; pwd)"
 CERTHOME="/opt/cert"
 XCONF=/tmp/server-xray.json
 
@@ -36,7 +35,7 @@ usage() {
     echo "    -r|--request-domain <domain-name>     Domain name to request for letsencrypt cert"
     echo "    -c|--cert-home <cert-home-dir>        Reading TLS certs from folder <cert-home-dir>/<domain-name>/"
     echo "    -i|--stdin                            Read config from STDIN instead of auto generation"
-    echo "    -j|--json                             Json snippet to merge into the config. Say '{"log":{"loglevel":"info"}}'"
+    echo "    -j|--json                             Json snippet to merge into the config. Say '{\"log\":{\"loglevel\":\"info\"}}'"
     echo "    -d|--debug                            Start in debug mode with verbose output"
 }
 
@@ -232,7 +231,7 @@ done
 if [ -n "${DEBUG}" ]; then loglevel="debug"; else loglevel="warning"; fi
 Jroot=$(echo $Jroot| jq --arg loglevel "${loglevel}" '.log.loglevel |= $loglevel')
 
-if [ -n "${INJECT}" ]; then
+if [ -n "${INJECT[@]}" ]; then
     for JSON_IN in "${INJECT[@]}"
     do
         Jmerge=$(jq -nc "${JSON_IN}")
diff --git a/server-lgp.sh b/server-lgp.sh
index f09aa7b..2501ca5 100755
--- a/server-lgp.sh
+++ b/server-lgp.sh
@@ -1,7 +1,5 @@
 #!/bin/bash
 
-DIR=$(dirname $0)
-
 usage() {
     >&2 echo -e "VLESS-GRPC-PLAIN server builder"
     >&2 echo -e "Usage: server-lgp <s=svcname>,<d=domain.com>,<p=listen-port>,<u=id0>,<u=id1>...,[proxy_acpt],[fallback=host:port:path]"
@@ -50,7 +48,7 @@ if [ -z "${serviceName}" ]; then
     usage; exit 1
 fi
 
-if [ -z "${xuser}" ]; then
+if [ -z "${xuser[@]}" ]; then
     >&2 echo -e "Error: User undefined.\n"
     usage; exit 1
 fi
@@ -90,7 +88,7 @@ do
     IFS=':'; fopt=(${fb}); fopt=(${fopt[@]})
     fhost="${fopt[0]}"; fport="${fopt[1]}"; fpath="${fopt[2]}"
     unset IFS
-    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: ${fallback}\n"; usage; exit 1; fi
+    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: $fb\n"; usage; exit 1; fi
     if [ -z "${fhost}" ]; then fhost="127.0.0.1"; fi
     fdest="$fhost:$fport"
     Jfb=$(jq -nc --arg fdest "${fdest}" --arg fpath "${fpath}" '. |= {"dest":$fdest,"path":$fpath,"xver":1}')
diff --git a/server-lgr.sh b/server-lgr.sh
index 525bcc1..42ea2a7 100755
--- a/server-lgr.sh
+++ b/server-lgr.sh
@@ -1,7 +1,5 @@
 #!/bin/bash
 
-DIR=$(dirname $0)
-
 usage() {
     >&2 echo -e "VLESS-GRPC-REALITY server builder"
     >&2 echo -e "Usage: server-lgr ,<s=svcname>,<d=dest.com>,<prv=yy>,[pub=xx],[shortId=zz],<p=listen-port>,<u=id0>,<u=id1>...,[proxy_acpt],[fallback=host:port:path],[xtls]"
@@ -76,7 +74,7 @@ if [ -z "${serviceName}" ]; then
     usage; exit 1
 fi
 
-if [ -z "${xuser}" ]; then
+if [ -z "${xuser[@]}" ]; then
     >&2 echo -e "Error: User undefined.\n"
     usage; exit 1
 fi
@@ -115,7 +113,7 @@ inbound=$(echo $inbound| jq -c --arg dest "${dest}" --arg pubkey "${pubkey}" --a
 '.streamSettings.realitySettings += {"show":true,"dest":"\($dest):443","serverNames":[$dest],"privateKey":$prvkey,"publicKey":$pubkey}')
 
 # serverNames settings
-if [ -n "${serverNames}" ]; then
+if [ -n "${serverNames[@]}" ]; then
     JserverNames=$(printf '%s\n' "${serverNames[@]}"|jq -R|jq -sc)
     inbound=$(echo $inbound| jq -c --argjson JserverNames "${JserverNames}" '.streamSettings.realitySettings.serverNames += $JserverNames')
 fi
@@ -130,7 +128,7 @@ do
     IFS=':'; fopt=(${fb}); fopt=(${fopt[@]})
     fhost="${fopt[0]}"; fport="${fopt[1]}"; fpath="${fopt[2]}"
     unset IFS
-    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: ${fallback}\n"; usage; exit 1; fi
+    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: $fb\n"; usage; exit 1; fi
     if [ -z "${fhost}" ]; then fhost="127.0.0.1"; fi
     fdest="$fhost:$fport"
     Jfb=$(jq -nc --arg fdest "${fdest}" --arg fpath "${fpath}" '. |= {"dest":$fdest,"path":$fpath,"xver":1}')
diff --git a/server-lgt.sh b/server-lgt.sh
index ab6d16f..9a18c14 100755
--- a/server-lgt.sh
+++ b/server-lgt.sh
@@ -1,7 +1,5 @@
 #!/bin/bash
 
-DIR=$(dirname $0)
-
 usage() {
     >&2 echo -e "VLESS-GRPC-TLS server builder"
     >&2 echo -e "Usage: server-lgt <s=svcname>,<c=certhome-dir>,<d=domain.com>,<p=listen-port>,<u=id0>,<u=id1>...,[proxy_acpt],[fallback=host:port:path],[xtls]"
@@ -64,7 +62,7 @@ if [ -z "${serviceName}" ]; then
     usage; exit 1
 fi
 
-if [ -z "${xuser}" ]; then
+if [ -z "${xuser[@]}" ]; then
     >&2 echo -e "Error: User undefined.\n"
     usage; exit 1
 fi
@@ -111,7 +109,7 @@ do
     IFS=':'; fopt=(${fb}); fopt=(${fopt[@]})
     fhost="${fopt[0]}"; fport="${fopt[1]}"; fpath="${fopt[2]}"
     unset IFS
-    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: ${fallback}\n"; usage; exit 1; fi
+    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: $fb\n"; usage; exit 1; fi
     if [ -z "${fhost}" ]; then fhost="127.0.0.1"; fi
     fdest="$fhost:$fport"
     Jfb=$(jq -nc --arg fdest "${fdest}" --arg fpath "${fpath}" '. |= {"dest":$fdest,"path":$fpath,"xver":1}')
diff --git a/server-lsp.sh b/server-lsp.sh
index 92eca70..b589a65 100755
--- a/server-lsp.sh
+++ b/server-lsp.sh
@@ -1,7 +1,5 @@
 #!/bin/bash
 
-DIR=$(dirname $0)
-
 usage() {
     >&2 echo -e "VLESS-SPLT-PLAIN server builder"
     >&2 echo -e "Usage: server-lsp <w=webpath>,<d=domain.com>,<p=listen-port>,<u=id0>,<u=id1>...,[proxy_acpt],[fallback=host:port:path]"
@@ -50,7 +48,7 @@ if [ -z "${webpath}" ]; then
     usage; exit 1
 fi
 
-if [ -z "${xuser}" ]; then
+if [ -z "${xuser[@]}" ]; then
     >&2 echo -e "Error: User undefined.\n"
     usage; exit 1
 fi
@@ -90,7 +88,7 @@ do
     IFS=':'; fopt=(${fb}); fopt=(${fopt[@]})
     fhost="${fopt[0]}"; fport="${fopt[1]}"; fpath="${fopt[2]}"
     unset IFS
-    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: ${fallback}\n"; usage; exit 1; fi
+    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: $fb\n"; usage; exit 1; fi
     if [ -z "${fhost}" ]; then fhost="127.0.0.1"; fi
     fdest="$fhost:$fport"
     Jfb=$(jq -nc --arg fdest "${fdest}" --arg fpath "${fpath}" '. |= {"dest":$fdest,"path":$fpath,"xver":1}')
diff --git a/server-lst.sh b/server-lst.sh
index 6deffc3..b94e563 100755
--- a/server-lst.sh
+++ b/server-lst.sh
@@ -1,7 +1,5 @@
 #!/bin/bash
 
-DIR=$(dirname $0)
-
 usage() {
     >&2 echo -e "VLESS-SPLT-TLS server builder"
     >&2 echo -e "Usage: server-lst <w=webpath>,<c=certhome-dir>,<d=domain.com>,<p=listen-port>,<u=id0>,<u=id1>...,[proxy_acpt],[fallback=host:port:path],[xtls]"
@@ -64,7 +62,7 @@ if [ -z "${webpath}" ]; then
     usage; exit 1
 fi
 
-if [ -z "${xuser}" ]; then
+if [ -z "${xuser[@]}" ]; then
     >&2 echo -e "Error: User undefined.\n"
     usage; exit 1
 fi
@@ -111,7 +109,7 @@ do
     IFS=':'; fopt=(${fb}); fopt=(${fopt[@]})
     fhost="${fopt[0]}"; fport="${fopt[1]}"; fpath="${fopt[2]}"
     unset IFS
-    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: ${fallback}\n"; usage; exit 1; fi
+    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: $fb\n"; usage; exit 1; fi
     if [ -z "${fhost}" ]; then fhost="127.0.0.1"; fi
     fdest="$fhost:$fport"
     Jfb=$(jq -nc --arg fdest "${fdest}" --arg fpath "${fpath}" '. |= {"dest":$fdest,"path":$fpath,"xver":1}')
diff --git a/server-ltr.sh b/server-ltr.sh
index 4cf0aab..764cb1b 100755
--- a/server-ltr.sh
+++ b/server-ltr.sh
@@ -1,7 +1,5 @@
 #!/bin/bash
 
-DIR=$(dirname $0)
-
 usage() {
     >&2 echo -e "VLESS-TCP-REALITY server builder"
     >&2 echo -e "Usage: server-ltr <d=dest.com>,<prv=yy>,[pub=xx],[shortId=zz],<p=listen-port>,<u=id0>,<u=id1>...,[proxy_acpt],[fallback=host:port:path],[xtls]"
@@ -68,7 +66,7 @@ if [ -z "${prvkey}" ]; then
     >&2 echo -e "PublicKey: $pubkey\n"
 fi
 
-if [ -z "${xuser}" ]; then
+if [ -z "${xuser[@]}" ]; then
     >&2 echo -e "Error: User undefined.\n"
     usage; exit 1
 fi
@@ -107,7 +105,7 @@ inbound=$(echo $inbound| jq -c --arg dest "${dest}" --arg pubkey "${pubkey}" --a
 '.streamSettings.realitySettings += {"show":true,"dest":"\($dest):443","serverNames":[$dest],"privateKey":$prvkey,"publicKey":$pubkey}')
 
 # serverNames settings
-if [ -n "${serverNames}" ]; then
+if [ -n "${serverNames[@]}" ]; then
     JserverNames=$(printf '%s\n' "${serverNames[@]}"|jq -R|jq -sc)
     inbound=$(echo $inbound| jq -c --argjson JserverNames "${JserverNames}" '.streamSettings.realitySettings.serverNames += $JserverNames')
 fi
@@ -122,7 +120,7 @@ do
     IFS=':'; fopt=(${fb}); fopt=(${fopt[@]})
     fhost="${fopt[0]}"; fport="${fopt[1]}"; fpath="${fopt[2]}"
     unset IFS
-    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: ${fallback}\n"; usage; exit 1; fi
+    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: $fb\n"; usage; exit 1; fi
     if [ -z "${fhost}" ]; then fhost="127.0.0.1"; fi
     fdest="$fhost:$fport"
     Jfb=$(jq -nc --arg fdest "${fdest}" --arg fpath "${fpath}" '. |= {"dest":$fdest,"path":$fpath,"xver":1}')
diff --git a/server-ltt.sh b/server-ltt.sh
index 4c2b306..c9d6c8e 100755
--- a/server-ltt.sh
+++ b/server-ltt.sh
@@ -1,7 +1,5 @@
 #!/bin/bash
 
-DIR=$(dirname $0)
-
 usage() {
     >&2 echo -e "VLESS-TCP-TLS server builder"
     >&2 echo -e "Usage: server-ltt <c=certhome-dir>,<d=domain.com>,<p=listen-port>,<u=id0>,<u=id1>...,[proxy_acpt],[fallback=host:port:path],[xtls]"
@@ -56,7 +54,7 @@ if [ -z "${port}" ]; then
     usage; exit 1 ;
 fi
 
-if [ -z "${xuser}" ]; then
+if [ -z "${xuser[@]}" ]; then
     >&2 echo -e "Error: User undefined.\n"
     usage; exit 1
 fi
@@ -103,7 +101,7 @@ do
     IFS=':'; fopt=(${fb}); fopt=(${fopt[@]})
     fhost="${fopt[0]}"; fport="${fopt[1]}"; fpath="${fopt[2]}"
     unset IFS
-    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: ${fallback}\n"; usage; exit 1; fi
+    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: $fb\n"; usage; exit 1; fi
     if [ -z "${fhost}" ]; then fhost="127.0.0.1"; fi
     fdest="$fhost:$fport"
     Jfb=$(jq -nc --arg fdest "${fdest}" --arg fpath "${fpath}" '. |= {"dest":$fdest,"path":$fpath,"xver":1}')
diff --git a/server-lwp.sh b/server-lwp.sh
index 41e703e..ae9c94d 100755
--- a/server-lwp.sh
+++ b/server-lwp.sh
@@ -48,7 +48,7 @@ if [ -z "${wspath}" ]; then
     usage; exit 1
 fi
 
-if [ -z "${xuser}" ]; then
+if [ -z "${xuser[@]}" ]; then
     >&2 echo -e "Error: User undefined.\n"
     usage; exit 1
 fi
@@ -88,7 +88,7 @@ do
     IFS=':'; fopt=(${fb}); fopt=(${fopt[@]})
     fhost="${fopt[0]}"; fport="${fopt[1]}"; fpath="${fopt[2]}"
     unset IFS
-    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: ${fallback}\n"; usage; exit 1; fi
+    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: $fb\n"; usage; exit 1; fi
     if [ -z "${fhost}" ]; then fhost="127.0.0.1"; fi
     fdest="$fhost:$fport"
     Jfb=$(jq -nc --arg fdest "${fdest}" --arg fpath "${fpath}" '. |= {"dest":$fdest,"path":$fpath,"xver":1}')
diff --git a/server-lwt.sh b/server-lwt.sh
index a02840c..43e85cb 100755
--- a/server-lwt.sh
+++ b/server-lwt.sh
@@ -1,7 +1,5 @@
 #!/bin/bash
 
-DIR=$(dirname $0)
-
 usage() {
     >&2 echo -e "VLESS-WS-TLS server builder"
     >&2 echo -e "Usage: server-lwt <w=wskpath>,<c=certhome-dir>,<d=domain.com>,<p=listen-port>,<u=id0>,<u=id1>...,[proxy_acpt],[fallback=host:port:path],[xtls]"
@@ -64,7 +62,7 @@ if [ -z "${wspath}" ]; then
     usage; exit 1
 fi
 
-if [ -z "${xuser}" ]; then
+if [ -z "${xuser[@]}" ]; then
     >&2 echo -e "Error: User undefined.\n"
     usage; exit 1
 fi
@@ -111,7 +109,7 @@ do
     IFS=':'; fopt=(${fb}); fopt=(${fopt[@]})
     fhost="${fopt[0]}"; fport="${fopt[1]}"; fpath="${fopt[2]}"
     unset IFS
-    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: ${fallback}\n"; usage; exit 1; fi
+    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: $fb\n"; usage; exit 1; fi
     if [ -z "${fhost}" ]; then fhost="127.0.0.1"; fi
     fdest="$fhost:$fport"
     Jfb=$(jq -nc --arg fdest "${fdest}" --arg fpath "${fpath}" '. |= {"dest":$fdest,"path":$fpath,"xver":1}')
diff --git a/server-mtt.sh b/server-mtt.sh
index 04ebba3..ce76219 100755
--- a/server-mtt.sh
+++ b/server-mtt.sh
@@ -1,7 +1,5 @@
 #!/bin/bash
 
-DIR=$(dirname $0)
-
 usage() {
     >&2 echo -e "VMESS-TCP-TLS server builder"
     >&2 echo -e "Usage: server-mtt <c=certhome-dir>,<d=domain.com>,<p=listen-port>,<u=id0>,<u=id1>...,[proxy_acpt],[fallback=host:port:path],[xtls]"
@@ -56,7 +54,7 @@ if [ -z "${port}" ]; then
     usage; exit 1 ;
 fi
 
-if [ -z "${xuser}" ]; then
+if [ -z "${xuser[@]}" ]; then
     >&2 echo -e "Error: User undefined.\n"
     usage; exit 1
 fi
@@ -103,7 +101,7 @@ do
     IFS=':'; fopt=(${fb}); fopt=(${fopt[@]})
     fhost="${fopt[0]}"; fport="${fopt[1]}"; fpath="${fopt[2]}"
     unset IFS
-    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: ${fallback}\n"; usage; exit 1; fi
+    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: $fb\n"; usage; exit 1; fi
     if [ -z "${fhost}" ]; then fhost="127.0.0.1"; fi
     fdest="$fhost:$fport"
     Jfb=$(jq -nc --arg fdest "${fdest}" --arg fpath "${fpath}" '. |= {"dest":$fdest,"path":$fpath,"xver":1}')
diff --git a/server-mwp.sh b/server-mwp.sh
index 3887f29..9da3874 100755
--- a/server-mwp.sh
+++ b/server-mwp.sh
@@ -1,7 +1,5 @@
 #!/bin/bash
 
-DIR=$(dirname $0)
-
 usage() {
     >&2 echo -e "VMESS-WS-PLAIN server builder"
     >&2 echo -e "Usage: server-mwp <w=wskpath>,<d=domain.com>,<p=listen-port>,<u=id0>,<u=id1>...,[proxy_acpt],[fallback=host:port:path]"
@@ -50,7 +48,7 @@ if [ -z "${wspath}" ]; then
     usage; exit 1
 fi
 
-if [ -z "${xuser}" ]; then
+if [ -z "${xuser[@]}" ]; then
     >&2 echo -e "Error: User undefined.\n"
     usage; exit 1
 fi
@@ -91,7 +89,7 @@ do
     fhost="${fopt[0]}"; fport="${fopt[1]}"; fpath="${fopt[2]}"
     unset IFS
     if [ -z "${fport}" ]; then
-        >&2 echo -e "Incorrect fallback format: ${fallback}\n"
+        >&2 echo -e "Incorrect fallback format: $fb\n"
         usage; exit 1
     fi
     if [ -z "${fhost}" ]; then fhost="127.0.0.1"; fi
diff --git a/server-mwt.sh b/server-mwt.sh
index 1ad2d73..a240938 100755
--- a/server-mwt.sh
+++ b/server-mwt.sh
@@ -1,7 +1,5 @@
 #!/bin/bash
 
-DIR=$(dirname $0)
-
 usage() {
     >&2 echo -e "VMESS-WS-TLS server builder"
     >&2 echo -e "Usage: server-mwt <w=wskpath>,<c=certhome-dir>,<d=domain.com>,<p=listen-port>,<u=id0>,<u=id1>...,[proxy_acpt],[fallback=host:port:path],[xtls]"
@@ -64,7 +62,7 @@ if [ -z "${wspath}" ]; then
     usage; exit 1
 fi
 
-if [ -z "${xuser}" ]; then
+if [ -z "${xuser[@]}" ]; then
     >&2 echo -e "Error: User undefined.\n"
     usage; exit 1
 fi
@@ -112,7 +110,7 @@ do
     fhost="${fopt[0]}"; fport="${fopt[1]}"; fpath="${fopt[2]}"
     unset IFS
     if [ -z "${fport}" ]; then
-        >&2 echo -e "Incorrect fallback format: ${fallback}\n"
+        >&2 echo -e "Incorrect fallback format: $fb\n"
         usage; exit 1
     fi
     if [ -z "${fhost}" ]; then fhost="127.0.0.1"; fi
diff --git a/server-nginx.sh b/server-nginx.sh
index cc26dc8..75ffc66 100755
--- a/server-nginx.sh
+++ b/server-nginx.sh
@@ -1,7 +1,5 @@
 #!/bin/bash
 
-DIR=$(dirname $0)
-DIR="$(cd $DIR; pwd)"
 SITE_TPL="nginx-site.tpl"
 STREAM_TPL="nginx-stream.tpl"
 NGCONF="/etc/nginx/nginx.conf"
@@ -106,7 +104,7 @@ options=($(echo $STSVR |tr ',' ' '))
             esac
         done
         # Naming the upstream as yahoo_com_jp for SNI yahoo.com.jp
-        upsname=$(echo $sni|sed 's/\./_/g')
+        upsname=$(echo "${sni//\./_}")
         echo "        $sni $upsname;"       >>/tmp/stmap.conf
         echo "    upstream $upsname {"      >>/tmp/stups.conf
         echo "        server $upstream;"    >>/tmp/stups.conf
diff --git a/server-ttt.sh b/server-ttt.sh
index 282f6ef..b6f7f60 100755
--- a/server-ttt.sh
+++ b/server-ttt.sh
@@ -1,7 +1,5 @@
 #!/bin/bash
 
-DIR=$(dirname $0)
-
 usage() {
     >&2 echo -e "TROJAN-TCP-TLS server builder"
     >&2 echo -e "Usage: server-ttt <c=certhome-dir>,<d=domain.com>,<p=listen-port>,<u=id0>,<u=id1>...,[proxy_acpt],[fallback=host:port:path],[xtls]"
@@ -56,7 +54,7 @@ if [ -z "${port}" ]; then
     usage; exit 1 ;
 fi
 
-if [ -z "${xuser}" ]; then
+if [ -z "${xuser[@]}" ]; then
     >&2 echo -e "Error: User undefined.\n"
     usage; exit 1
 fi
@@ -103,7 +101,7 @@ do
     IFS=':'; fopt=(${fb}); fopt=(${fopt[@]})
     fhost="${fopt[0]}"; fport="${fopt[1]}"; fpath="${fopt[2]}"
     unset IFS
-    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: ${fallback}\n"; usage; exit 1; fi
+    if [ -z "${fport}" ]; then >&2 echo -e "Incorrect fallback format: $fb\n"; usage; exit 1; fi
     if [ -z "${fhost}" ]; then fhost="127.0.0.1"; fi
     fdest="$fhost:$fport"
     Jfb=$(jq -nc --arg fdest "${fdest}" --arg fpath "${fpath}" '. |= {"dest":$fdest,"path":$fpath,"xver":1}')
diff --git a/server-twp.sh b/server-twp.sh
index 4418a7d..fde1e87 100755
--- a/server-twp.sh
+++ b/server-twp.sh
@@ -1,7 +1,5 @@
 #!/bin/bash
 
-DIR=$(dirname $0)
-
 usage() {
     >&2 echo -e "TROJAN-WS-PLAIN server builder"
     >&2 echo -e "Usage: server-twp <w=wskpath>,<d=domain.com>,<p=listen-port>,<u=id0>,<u=id1>...,[proxy_acpt],[fallback=host:port:path]"
@@ -50,7 +48,7 @@ if [ -z "${wspath}" ]; then
     usage; exit 1
 fi
 
-if [ -z "${xuser}" ]; then
+if [ -z "${xuser[@]}" ]; then
     >&2 echo -e "Error: User undefined.\n"
     usage; exit 1
 fi
@@ -91,7 +89,7 @@ do
     fhost="${fopt[0]}"; fport="${fopt[1]}"; fpath="${fopt[2]}"
     unset IFS
     if [ -z "${fport}" ]; then
-        >&2 echo -e "Incorrect fallback format: ${fallback}\n"
+        >&2 echo -e "Incorrect fallback format: $fb\n"
         usage; exit 1
     fi
     if [ -z "${fhost}" ]; then fhost="127.0.0.1"; fi
diff --git a/server-twt.sh b/server-twt.sh
index 8c185fe..5424faa 100755
--- a/server-twt.sh
+++ b/server-twt.sh
@@ -1,7 +1,5 @@
 #!/bin/bash
 
-DIR=$(dirname $0)
-
 usage() {
     >&2 echo -e "TROJAN-WS-TLS server builder"
     >&2 echo -e "Usage: server-twt <w=wskpath>,<c=certhome-dir>,<d=domain.com>,<p=listen-port>,<u=id0>,<u=id1>...,[proxy_acpt],[fallback=host:port:path],[xtls]"
@@ -64,7 +62,7 @@ if [ -z "${wspath}" ]; then
     usage; exit 1
 fi
 
-if [ -z "${xuser}" ]; then
+if [ -z "${xuser[@]}" ]; then
     >&2 echo -e "Error: User undefined.\n"
     usage; exit 1
 fi
@@ -112,7 +110,7 @@ do
     fhost="${fopt[0]}"; fport="${fopt[1]}"; fpath="${fopt[2]}"
     unset IFS
     if [ -z "${fport}" ]; then
-        >&2 echo -e "Incorrect fallback format: ${fallback}\n"
+        >&2 echo -e "Incorrect fallback format: $fb\n"
         usage; exit 1
     fi
     if [ -z "${fhost}" ]; then fhost="127.0.0.1"; fi