diff --git a/README.md b/README.md
index 7b9d0025..90a64ee0 100644
--- a/README.md
+++ b/README.md
@@ -269,6 +269,7 @@ You don't have to do anything manually!
 1. aliyun.com(阿里云) API
 1. ISPConfig 3.1 API
 1. Alwaysdata.com API
+1. Linode.com API
 
 **More APIs coming soon...**
 
diff --git a/acme.sh b/acme.sh
index cf82153a..e5728b3c 100755
--- a/acme.sh
+++ b/acme.sh
@@ -344,11 +344,7 @@ _is_solaris() {
 #input:"abc"
 #output: " 61 62 63"
 _hex_dump() {
-  if _is_solaris; then
-    od -A n -v -t x1 | tr -d "\r\n\t" | tr -s " " | tr -d "\n"
-  else
-    od -A n -v -t x1 | tr -d "\r\n\t" | tr -s " " | sed "s/ $//" | tr -d "\n"
-  fi
+  od -A n -v -t x1 | tr -d "\r\t" | tr -s " " | sed "s/ $//" | tr -d "\n"
 }
 
 #url encode, no-preserved chars
diff --git a/dnsapi/README.md b/dnsapi/README.md
index e32b4655..df728acc 100644
--- a/dnsapi/README.md
+++ b/dnsapi/README.md
@@ -257,6 +257,27 @@ acme.sh --issue --dns dns_ad -d example.com -d www.example.com
 The `AD_API_KEY` will be saved in `~/.acme.sh/account.conf` and will be reused
 when needed.
 
+## 14. Use Linode domain API
+
+First you need to login to your Linode account to get your API Key.
+[https://manager.linode.com/profile/api](https://manager.linode.com/profile/api)
+
+Then add an API key with label *ACME* and copy the new key.
+
+```sh
+export LINODE_API_KEY="..."
+```
+
+Due to the reload time of any changes in the DNS records, we have to use the `dnssleep` option to wait at least 15 minutes for the changes to take effect.
+
+Ok, let's issue a cert now:
+
+```sh
+acme.sh --issue --dns dns_linode --dnssleep 900 -d example.com -d www.example.com
+```
+
+The `LINODE_API_KEY` will be saved in `~/.acme.sh/account.conf` and will be reused when needed.
+
 # Use custom API
 
 If your API is not supported yet, you can write your own DNS API.
diff --git a/dnsapi/dns_ali.sh b/dnsapi/dns_ali.sh
index 9b6f85c8..f796f076 100644
--- a/dnsapi/dns_ali.sh
+++ b/dnsapi/dns_ali.sh
@@ -67,7 +67,7 @@ _get_root() {
 }
 
 _ali_rest() {
-  signature=$(printf "%s" "GET&%2F&$(_ali_urlencode "$query")" | _hmac "sha1" "$(printf "%s" "$Ali_Secret&" | _hex_dump | sed "s/ //g")" | _base64)
+  signature=$(printf "%s" "GET&%2F&$(_ali_urlencode "$query")" | _hmac "sha1" "$(printf "%s" "$Ali_Secret&" | _hex_dump | tr -d " ")" | _base64)
   signature=$(_ali_urlencode "$signature")
   url="$Ali_API?$query&Signature=$signature"
 
diff --git a/dnsapi/dns_aws.sh b/dnsapi/dns_aws.sh
index 5e7b34f5..555bd70b 100644
--- a/dnsapi/dns_aws.sh
+++ b/dnsapi/dns_aws.sh
@@ -93,7 +93,7 @@ _get_root() {
       fi
 
       if _contains "$response" "<Name>$h.</Name>"; then
-        hostedzone="$(echo "$response" | sed 's/<HostedZone>/\n&/g' | _egrep_o "<HostedZone>.*?<Name>$h.<.Name>.*?<.HostedZone>")"
+        hostedzone="$(echo "$response" | _egrep_o "<HostedZone><Id>[^<]*<.Id><Name>$h.<.Name>.*<.HostedZone>")"
         _debug hostedzone "$hostedzone"
         if [ -z "$hostedzone" ]; then
           _err "Error, can not get hostedzone."
@@ -183,7 +183,7 @@ aws_rest() {
 
   _debug2 kSecret "$kSecret"
 
-  kSecretH="$(printf "%s" "$kSecret" | _hex_dump | sed "s/ //g")"
+  kSecretH="$(printf "%s" "$kSecret" | _hex_dump | tr -d " ")"
   _debug2 kSecretH "$kSecretH"
 
   kDateH="$(printf "$RequestDateOnly%s" | _hmac "$Hash" "$kSecretH" hex)"
diff --git a/dnsapi/dns_cx.sh b/dnsapi/dns_cx.sh
index 9c032fd7..2b6d5691 100755
--- a/dnsapi/dns_cx.sh
+++ b/dnsapi/dns_cx.sh
@@ -82,7 +82,7 @@ existing_records() {
     return 1
   fi
 
-  seg=$(printf "%s\n" "$response" | _egrep_o '[^{]*host":"'"$_sub_domain"'"[^}]*\}')
+  seg=$(printf "%s\n" "$response" | _egrep_o '"record_id":[^{]*host":"'"$_sub_domain"'"[^}]*\}')
   _debug seg "$seg"
   if [ -z "$seg" ]; then
     return 0
@@ -155,7 +155,7 @@ _get_root() {
     fi
 
     if _contains "$response" "$h."; then
-      seg=$(printf "%s\n" "$response" | _egrep_o '[^{]*"'"$h"'."[^}]*}')
+      seg=$(printf "%s\n" "$response" | _egrep_o '"id":[^{]*"'"$h"'."[^}]*}')
       _debug seg "$seg"
       _domain_id=$(printf "%s\n" "$seg" | _egrep_o "\"id\":\"[^\"]*\"" | cut -d : -f 2 | tr -d \")
       _debug _domain_id "$_domain_id"
diff --git a/dnsapi/dns_linode.sh b/dnsapi/dns_linode.sh
new file mode 100755
index 00000000..6d54e6c1
--- /dev/null
+++ b/dnsapi/dns_linode.sh
@@ -0,0 +1,183 @@
+#!/usr/bin/env sh
+
+#Author: Philipp Grosswiler <philipp.grosswiler@swiss-design.net>
+
+LINODE_API_URL="https://api.linode.com/?api_key=$LINODE_API_KEY&api_action="
+
+########  Public functions #####################
+
+#Usage: dns_linode_add   _acme-challenge.www.domain.com   "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
+dns_linode_add() {
+  fulldomain="${1}"
+  txtvalue="${2}"
+
+  if ! _Linode_API; then
+    return 1
+  fi
+
+  _info "Using Linode"
+  _debug "Calling: dns_linode_add() '${fulldomain}' '${txtvalue}'"
+
+  _debug "First detect the root zone"
+  if ! _get_root "$fulldomain"; then
+    _err "Domain does not exist."
+    return 1
+  fi
+  _debug _domain_id "$_domain_id"
+  _debug _sub_domain "$_sub_domain"
+  _debug _domain "$_domain"
+
+  _parameters="&DomainID=$_domain_id&Type=TXT&Name=$_sub_domain&Target=$txtvalue"
+
+  if _rest GET "domain.resource.create" "$_parameters" && [ -n "$response" ]; then
+    _resource_id=$(printf "%s\n" "$response" | _egrep_o "\"ResourceID\":\s*[0-9]+" | cut -d : -f 2 | tr -d " " | _head_n 1)
+    _debug _resource_id "$_resource_id"
+
+    if [ -z "$_resource_id" ]; then
+      _err "Error adding the domain resource."
+      return 1
+    fi
+
+    _info "Domain resource successfully added."
+    return 0
+  fi
+
+  return 1
+}
+
+#Usage: dns_linode_rm   _acme-challenge.www.domain.com
+dns_linode_rm() {
+  fulldomain="${1}"
+
+  if ! _Linode_API; then
+    return 1
+  fi
+
+  _info "Using Linode"
+  _debug "Calling: dns_linode_rm() '${fulldomain}'"
+
+  _debug "First detect the root zone"
+  if ! _get_root "$fulldomain"; then
+    _err "Domain does not exist."
+    return 1
+  fi
+  _debug _domain_id "$_domain_id"
+  _debug _sub_domain "$_sub_domain"
+  _debug _domain "$_domain"
+
+  _parameters="&DomainID=$_domain_id"
+
+  if _rest GET "domain.resource.list" "$_parameters" && [ -n "$response" ]; then
+    response="$(echo "$response" | tr -d "\n" | sed 's/{/\n&/g')"
+
+    resource="$(echo "$response" | _egrep_o "{.*\"NAME\":\s*\"$_sub_domain\".*}")"
+    if [ "$resource" ]; then
+      _resource_id=$(printf "%s\n" "$resource" | _egrep_o "\"RESOURCEID\":\s*[0-9]+" | _head_n 1 | cut -d : -f 2 | tr -d \ )
+      if [ "$_resource_id" ]; then
+        _debug _resource_id "$_resource_id"
+
+        _parameters="&DomainID=$_domain_id&ResourceID=$_resource_id"
+
+        if _rest GET "domain.resource.delete" "$_parameters" && [ -n "$response" ]; then
+          _resource_id=$(printf "%s\n" "$response" | _egrep_o "\"ResourceID\":\s*[0-9]+" | cut -d : -f 2 | tr -d " " | _head_n 1)
+          _debug _resource_id "$_resource_id"
+
+          if [ -z "$_resource_id" ]; then
+            _err "Error deleting the domain resource."
+            return 1
+          fi
+
+          _info "Domain resource successfully deleted."
+          return 0
+        fi
+      fi
+
+      return 1
+    fi
+
+    return 0
+  fi
+
+  return 1
+}
+
+####################  Private functions below ##################################
+
+_Linode_API() {
+  if [ -z "$LINODE_API_KEY" ]; then
+    LINODE_API_KEY=""
+
+    _err "You didn't specify the Linode API key yet."
+    _err "Please create your key and try again."
+
+    return 1
+  fi
+
+  _saveaccountconf LINODE_API_KEY "$LINODE_API_KEY"
+}
+
+####################  Private functions below ##################################
+#_acme-challenge.www.domain.com
+#returns
+# _sub_domain=_acme-challenge.www
+# _domain=domain.com
+# _domain_id=12345
+_get_root() {
+  domain=$1
+  i=2
+  p=1
+
+  if _rest GET "domain.list"; then
+    response="$(echo "$response" | tr -d "\n" | sed 's/{/\n&/g')"
+    while true; do
+      h=$(printf "%s" "$domain" | cut -d . -f $i-100)
+      _debug h "$h"
+      if [ -z "$h" ]; then
+        #not valid
+        return 1
+      fi
+
+      hostedzone="$(echo "$response" | _egrep_o "{.*\"DOMAIN\":\s*\"$h\".*}")"
+      if [ "$hostedzone" ]; then
+        _domain_id=$(printf "%s\n" "$hostedzone" | _egrep_o "\"DOMAINID\":\s*[0-9]+" | _head_n 1 | cut -d : -f 2 | tr -d \ )
+        if [ "$_domain_id" ]; then
+          _sub_domain=$(printf "%s" "$domain" | cut -d . -f 1-$p)
+          _domain=$h
+          return 0
+        fi
+        return 1
+      fi
+      p=$i
+      i=$(_math "$i" + 1)
+    done
+  fi
+  return 1
+}
+
+#method method action data
+_rest() {
+  mtd="$1"
+  ep="$2"
+  data="$3"
+
+  _debug mtd "$mtd"
+  _debug ep "$ep"
+
+  export _H1="Accept: application/json"
+  export _H2="Content-Type: application/json"
+
+  if [ "$mtd" != "GET" ]; then
+    # both POST and DELETE.
+    _debug data "$data"
+    response="$(_post "$data" "$LINODE_API_URL$ep" "" "$mtd")"
+  else
+    response="$(_get "$LINODE_API_URL$ep$data")"
+  fi
+
+  if [ "$?" != "0" ]; then
+    _err "error $ep"
+    return 1
+  fi
+  _debug2 response "$response"
+  return 0
+}
diff --git a/dnsapi/dns_lua.sh b/dnsapi/dns_lua.sh
index 47f4497a..42d55e84 100755
--- a/dnsapi/dns_lua.sh
+++ b/dnsapi/dns_lua.sh
@@ -46,12 +46,12 @@ dns_lua_add() {
     return 1
   fi
 
-  count=$(printf "%s\n" "$response" | _egrep_o "\"name\":\"$fulldomain\"" | wc -l)
+  count=$(printf "%s\n" "$response" | _egrep_o "\"name\":\"$fulldomain.\",\"type\":\"TXT\"" | wc -l | tr -d " ")
   _debug count "$count"
   if [ "$count" = "0" ]; then
     _info "Adding record"
     if _LUA_rest POST "zones/$_domain_id/records" "{\"type\":\"TXT\",\"name\":\"$fulldomain.\",\"content\":\"$txtvalue\",\"ttl\":120}"; then
-      if printf -- "%s" "$response" | grep "$fulldomain" >/dev/null; then
+      if _contains "$response" "$fulldomain"; then
         _info "Added"
         #todo: check if the record takes effect
         return 0
@@ -63,11 +63,11 @@ dns_lua_add() {
     _err "Add txt record error."
   else
     _info "Updating record"
-    record_id=$(printf "%s\n" "$response" | _egrep_o "\"id\":[^,]*,\"name\":\"$fulldomain.\",\"type\":\"TXT\"" | cut -d: -f2 | cut -d, -f1)
+    record_id=$(printf "%s\n" "$response" | _egrep_o "\"id\":[^,]*,\"name\":\"$fulldomain.\",\"type\":\"TXT\"" | _head_n 1 | cut -d: -f2 | cut -d, -f1)
     _debug "record_id" "$record_id"
 
-    _LUA_rest PUT "zones/$_domain_id/records/$record_id" "{\"id\":\"$record_id\",\"type\":\"TXT\",\"name\":\"$fulldomain.\",\"content\":\"$txtvalue\",\"zone_id\":\"$_domain_id\",\"ttl\":120}"
-    if [ "$?" = "0" ]; then
+    _LUA_rest PUT "zones/$_domain_id/records/$record_id" "{\"id\":$record_id,\"type\":\"TXT\",\"name\":\"$fulldomain.\",\"content\":\"$txtvalue\",\"zone_id\":$_domain_id,\"ttl\":120}"
+    if [ "$?" = "0" ] && _contains "$response" "updated_at" ; then
       _info "Updated!"
       #todo: check if the record takes effect
       return 0
@@ -99,6 +99,7 @@ _get_root() {
   fi
   while true; do
     h=$(printf "%s" "$domain" | cut -d . -f $i-100)
+    _debug h "$h"
     if [ -z "$h" ]; then
       #not valid
       return 1
@@ -106,6 +107,7 @@ _get_root() {
 
     if _contains "$response" "\"name\":\"$h\""; then
       _domain_id=$(printf "%s\n" "$response" | _egrep_o "\"id\":[^,]*,\"name\":\"$h\"" | cut -d : -f 2 | cut -d , -f 1)
+      _debug _domain_id "$_domain_id"
       if [ "$_domain_id" ]; then
         _sub_domain=$(printf "%s" "$domain" | cut -d . -f 1-$p)
         _domain="$h"
diff --git a/dnsapi/dns_me.sh b/dnsapi/dns_me.sh
index c6bec70d..f63621d9 100755
--- a/dnsapi/dns_me.sh
+++ b/dnsapi/dns_me.sh
@@ -124,7 +124,7 @@ _me_rest() {
   _debug "$ep"
 
   cdate=$(date -u +"%a, %d %b %Y %T %Z")
-  hmac=$(printf "%s" "$cdate" | _hmac sha1 "$(printf "%s" "$ME_Secret" | _hex_dump | sed "s/ //g")" hex)
+  hmac=$(printf "%s" "$cdate" | _hmac sha1 "$(printf "%s" "$ME_Secret" | _hex_dump | tr -d " ")" hex)
 
   export _H1="x-dnsme-apiKey: $ME_Key"
   export _H2="x-dnsme-requestDate: $cdate"