diff --git a/scripts/clock-skew.nse b/scripts/clock-skew.nse
index 3f1e732a3..1054240ad 100644
--- a/scripts/clock-skew.nse
+++ b/scripts/clock-skew.nse
@@ -1,5 +1,4 @@
 local coroutine = require "coroutine"
-local datetime = require "datetime"
 local formulas = require "formulas"
 local math = require "math"
 local nmap = require "nmap"
diff --git a/scripts/firewalk.nse b/scripts/firewalk.nse
index 098022b9a..698291bfa 100644
--- a/scripts/firewalk.nse
+++ b/scripts/firewalk.nse
@@ -1,4 +1,3 @@
-local bin = require "bin"
 local ipOps = require "ipOps"
 local math = require "math"
 local nmap = require "nmap"
@@ -1061,4 +1060,3 @@ action = function(host)
 
   return report(scanner)
 end
-
diff --git a/scripts/ftp-anon.nse b/scripts/ftp-anon.nse
index 3679b5c6e..50274b547 100644
--- a/scripts/ftp-anon.nse
+++ b/scripts/ftp-anon.nse
@@ -5,7 +5,6 @@ local shortport = require "shortport"
 local stdnse = require "stdnse"
 local string = require "string"
 local table = require "table"
-local sslcert = require "sslcert"
 
 description = [[
 Checks if an FTP server allows anonymous logins.
diff --git a/scripts/ftp-syst.nse b/scripts/ftp-syst.nse
index bf667494c..f2a99bfbf 100644
--- a/scripts/ftp-syst.nse
+++ b/scripts/ftp-syst.nse
@@ -1,8 +1,6 @@
 local ftp = require "ftp"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
-local string = require "string"
-local table = require "table"
 
 description = [[
 Sends FTP SYST and STAT commands and returns the result.
diff --git a/scripts/ganglia-info.nse b/scripts/ganglia-info.nse
index a035105c3..30d6c9ca7 100644
--- a/scripts/ganglia-info.nse
+++ b/scripts/ganglia-info.nse
@@ -3,7 +3,6 @@ local nmap = require "nmap"
 local shortport = require "shortport"
 local slaxml = require "slaxml"
 local stdnse = require "stdnse"
-local string = require "string"
 local table = require "table"
 
 description = [[
@@ -244,4 +243,3 @@ action = function( host, port )
   if #state.result then return state.result end
 
 end
-
diff --git a/scripts/hostmap-robtex.nse b/scripts/hostmap-robtex.nse
index 69531de91..6ad7af325 100644
--- a/scripts/hostmap-robtex.nse
+++ b/scripts/hostmap-robtex.nse
@@ -1,9 +1,7 @@
 local http = require "http"
 local ipOps = require "ipOps"
 local stdnse = require "stdnse"
-local string = require "string"
 local slaxml = require "slaxml"
-local table = require "table"
 
 description = [[
 Discovers hostnames that resolve to the target's IP address by querying the online Robtex service at http://ip.robtex.com/.
diff --git a/scripts/http-default-accounts.nse b/scripts/http-default-accounts.nse
index 68795cbd7..ca431083f 100644
--- a/scripts/http-default-accounts.nse
+++ b/scripts/http-default-accounts.nse
@@ -4,7 +4,6 @@ local http = require "http"
 local nmap = require "nmap"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
-local string = require "string"
 local table = require "table"
 
 description = [[
diff --git a/scripts/http-domino-enum-passwords.nse b/scripts/http-domino-enum-passwords.nse
index 2223d4e75..5543a577a 100644
--- a/scripts/http-domino-enum-passwords.nse
+++ b/scripts/http-domino-enum-passwords.nse
@@ -4,7 +4,6 @@ local io = require "io"
 local nmap = require "nmap"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
-local string = require "string"
 local table = require "table"
 
 description = [[
diff --git a/scripts/http-internal-ip-disclosure.nse b/scripts/http-internal-ip-disclosure.nse
index 1cff0a189..aeb04b92c 100644
--- a/scripts/http-internal-ip-disclosure.nse
+++ b/scripts/http-internal-ip-disclosure.nse
@@ -1,4 +1,3 @@
-local http = require "http"
 local nmap = require "nmap"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
diff --git a/scripts/http-ntlm-info.nse b/scripts/http-ntlm-info.nse
index 89e68cd78..440634096 100644
--- a/scripts/http-ntlm-info.nse
+++ b/scripts/http-ntlm-info.nse
@@ -1,4 +1,3 @@
-local bin = require "bin"
 local os = require "os"
 local datetime = require "datetime"
 local http = require "http"
diff --git a/scripts/http-svn-enum.nse b/scripts/http-svn-enum.nse
index d7c3c7927..4a231137c 100644
--- a/scripts/http-svn-enum.nse
+++ b/scripts/http-svn-enum.nse
@@ -3,7 +3,6 @@ local shortport = require "shortport"
 local slaxml = require "slaxml"
 local stdnse = require "stdnse"
 local tab = require "tab"
-local table = require "table"
 
 description = [[Enumerates users of a Subversion repository by examining logs of most recent commits.
 ]]
@@ -131,4 +130,3 @@ action = function(host, port)
     end
   end
 end
-
diff --git a/scripts/http-svn-info.nse b/scripts/http-svn-info.nse
index 66d4da485..257d38ca3 100644
--- a/scripts/http-svn-info.nse
+++ b/scripts/http-svn-info.nse
@@ -2,7 +2,6 @@ local http = require "http"
 local shortport = require "shortport"
 local slaxml = require "slaxml"
 local stdnse = require "stdnse"
-local string = require "string"
 
 description = [[Requests information from a Subversion repository.
 ]]
diff --git a/scripts/http-vuln-cve2013-6786.nse b/scripts/http-vuln-cve2013-6786.nse
index 8307973de..6696fae81 100644
--- a/scripts/http-vuln-cve2013-6786.nse
+++ b/scripts/http-vuln-cve2013-6786.nse
@@ -37,7 +37,6 @@ categories = {"exploit","vuln"}
 local http = require "http"
 local nmap = require "nmap"
 local shortport = require "shortport"
-local string = require "string"
 local vulns = require "vulns"
 local stdnse = require "stdnse"
 
diff --git a/scripts/http-vuln-cve2014-3704.nse b/scripts/http-vuln-cve2014-3704.nse
index 3f2ecff8d..44e5616de 100644
--- a/scripts/http-vuln-cve2014-3704.nse
+++ b/scripts/http-vuln-cve2014-3704.nse
@@ -6,7 +6,6 @@ local string = require "string"
 local table = require "table"
 local url = require "url"
 local vulns = require "vulns"
-local re = require "re"
 local openssl = require "openssl"
 
 description = [[
diff --git a/scripts/http-vuln-cve2015-1427.nse b/scripts/http-vuln-cve2015-1427.nse
index f14cd33c1..832eeef3c 100644
--- a/scripts/http-vuln-cve2015-1427.nse
+++ b/scripts/http-vuln-cve2015-1427.nse
@@ -4,7 +4,6 @@ local stdnse = require "stdnse"
 local string = require "string"
 local vulns = require "vulns"
 local json = require "json"
-local base64 = require "base64"
 local nmap = require "nmap"
 
 description = [[
@@ -208,4 +207,3 @@ action = function(host, port)
   cleanup()
   return report:make_output(vuln_table)
 end
-
diff --git a/scripts/http-vuln-cve2017-1001000.nse b/scripts/http-vuln-cve2017-1001000.nse
index 4446dc60a..ed32580ea 100644
--- a/scripts/http-vuln-cve2017-1001000.nse
+++ b/scripts/http-vuln-cve2017-1001000.nse
@@ -1,23 +1,21 @@
 local http = require "http"
 local shortport = require "shortport"
-local string = require "string"
 local stdnse = require "stdnse"
-local url = require "url"
 local vulns = require "vulns"
 local json = require "json"
 
-description = [[ 
-Attempts to detect a privilege escalation vulnerability in Wordpress 4.7.0 and 4.7.1 that 
+description = [[
+Attempts to detect a privilege escalation vulnerability in Wordpress 4.7.0 and 4.7.1 that
 allows unauthenticated users to inject content in posts.
 
-The script connects to the Wordpress REST API to obtain the list of published posts and 
-grabs the user id and date from there. Then it attempts to update the date field in the 
-post with the same date information we just obtained. If the request doesn’t return an 
+The script connects to the Wordpress REST API to obtain the list of published posts and
+grabs the user id and date from there. Then it attempts to update the date field in the
+post with the same date information we just obtained. If the request doesn’t return an
 error, we mark the server as vulnerable.
 
 References:
-https://blog.sucuri.net/2017/02/content-injection-vulnerability-wordpress-rest-api.html 
- 
+https://blog.sucuri.net/2017/02/content-injection-vulnerability-wordpress-rest-api.html
+
   ]]
 
 ---
@@ -33,13 +31,13 @@ https://blog.sucuri.net/2017/02/content-injection-vulnerability-wordpress-rest-a
 -- |   Content Injection in Wordpress REST API
 -- |     State: VULNERABLE (Exploitable)
 -- |     IDs:  CVE:CVE-2017-1001000
--- |     Risk factor: Medium  CVSSv2: 5.0 (MEDIUM) 
+-- |     Risk factor: Medium  CVSSv2: 5.0 (MEDIUM)
 -- |       The privilege escalation vulnerability in WordPress REST API allows
--- |       the visitors to edit any post on the site 
+-- |       the visitors to edit any post on the site
 -- |       Versions 4.7.0 and 4.7.1 are known to be affected
--- |    
+-- |
 -- |     References:
--- |_      https://blog.sucuri.net/2017/02/content-injection-vulnerability-wordpress-rest-api.html 
+-- |_      https://blog.sucuri.net/2017/02/content-injection-vulnerability-wordpress-rest-api.html
 --
 -- @xmloutput
 -- <table key="CVE-2017-1001000">
@@ -106,7 +104,7 @@ Versions 4.7.0 and 4.7.1 are known to be affected.
       return vulnReport:make_output(vuln_table)
     end
 
-    --Modifying the uri and checking for response. 
+    --Modifying the uri and checking for response.
     --Date modification request is being sent.
     uri = uri ..id..'/'..'?id=' .. id ..'abc'..'&date='..content
 
diff --git a/scripts/http-webdav-scan.nse b/scripts/http-webdav-scan.nse
index 79aed3095..c55aa6f6c 100644
--- a/scripts/http-webdav-scan.nse
+++ b/scripts/http-webdav-scan.nse
@@ -3,7 +3,6 @@ local ipOps = require "ipOps"
 local table = require "table"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
-local string = require "string"
 
 description = [[
 A script to detect WebDAV installations. Uses the OPTIONS and PROPFIND methods.
@@ -180,4 +179,3 @@ function action (host, port)
 
   if #output > 0 then return output else return nil end
 end
-
diff --git a/scripts/imap-ntlm-info.nse b/scripts/imap-ntlm-info.nse
index b61b1491f..60a29a896 100644
--- a/scripts/imap-ntlm-info.nse
+++ b/scripts/imap-ntlm-info.nse
@@ -1,7 +1,6 @@
 local comm = require "comm"
 local os = require "os"
 local datetime = require "datetime"
-local bin = require "bin"
 local shortport = require "shortport"
 local sslcert = require "sslcert"
 local stdnse = require "stdnse"
diff --git a/scripts/ip-geolocation-map-kml.nse b/scripts/ip-geolocation-map-kml.nse
index 2cae31773..ade7b645b 100644
--- a/scripts/ip-geolocation-map-kml.nse
+++ b/scripts/ip-geolocation-map-kml.nse
@@ -1,4 +1,3 @@
-local http = require "http"
 local geoip = require "geoip"
 local io = require "io"
 local stdnse = require "stdnse"
diff --git a/scripts/ipmi-brute.nse b/scripts/ipmi-brute.nse
index e8fc54c3a..170683a92 100644
--- a/scripts/ipmi-brute.nse
+++ b/scripts/ipmi-brute.nse
@@ -4,8 +4,6 @@ local ipmi = require "ipmi"
 local nmap = require "nmap"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
-local string = require "string"
-local table = require "table"
 
 description = [[
 Performs brute force password auditing against IPMI RPC server.
diff --git a/scripts/ipv6-multicast-mld-list.nse b/scripts/ipv6-multicast-mld-list.nse
index 204fa3ea8..56cb60be7 100644
--- a/scripts/ipv6-multicast-mld-list.nse
+++ b/scripts/ipv6-multicast-mld-list.nse
@@ -5,7 +5,6 @@ local stdnse = require "stdnse"
 local string = require "string"
 local table = require "table"
 local multicast = require "multicast"
-local math = require "math"
 
 description = [[
 Uses Multicast Listener Discovery to list the multicast addresses subscribed to
diff --git a/scripts/ldap-novell-getpass.nse b/scripts/ldap-novell-getpass.nse
index b3568cba8..95c762d84 100644
--- a/scripts/ldap-novell-getpass.nse
+++ b/scripts/ldap-novell-getpass.nse
@@ -1,4 +1,3 @@
-local bin = require "bin"
 local comm = require "comm"
 local ldap = require "ldap"
 local shortport = require "shortport"
diff --git a/scripts/nje-pass-brute.nse b/scripts/nje-pass-brute.nse
index 906b5cb7e..ad3aa5354 100644
--- a/scripts/nje-pass-brute.nse
+++ b/scripts/nje-pass-brute.nse
@@ -1,6 +1,4 @@
-local io = require "io"
 local string = require "string"
-local table = require "table"
 local nmap = require "nmap"
 local stdnse = require "stdnse"
 local shortport = require "shortport"
@@ -9,7 +7,6 @@ local creds = require "creds"
 local unpwdb = require "unpwdb"
 local drda = require "drda"
 local comm = require "comm"
-local nsedebug = require "nsedebug"
 
 description = [[
 z/OS JES Network Job Entry (NJE) 'I record' password brute forcer.
diff --git a/scripts/ntp-info.nse b/scripts/ntp-info.nse
index cc77bb01d..01731bd30 100644
--- a/scripts/ntp-info.nse
+++ b/scripts/ntp-info.nse
@@ -2,7 +2,6 @@ local bin = require "bin"
 local comm = require "comm"
 local datetime = require "datetime"
 local os = require "os"
-local math = require "math"
 local nmap = require "nmap"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
diff --git a/scripts/omron-info.nse b/scripts/omron-info.nse
index d414cc3db..b260c98cb 100644
--- a/scripts/omron-info.nse
+++ b/scripts/omron-info.nse
@@ -2,7 +2,6 @@ local bin = require "bin"
 local nmap = require "nmap"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
-local table = require "table"
 
 description = [[
 This NSE script is used to send a FINS packet to a remote device. The script
diff --git a/scripts/path-mtu.nse b/scripts/path-mtu.nse
index 28d322d02..6dc441c43 100644
--- a/scripts/path-mtu.nse
+++ b/scripts/path-mtu.nse
@@ -1,4 +1,3 @@
-local bin = require "bin"
 local ipOps = require "ipOps"
 local math = require "math"
 local nmap = require "nmap"
@@ -398,4 +397,3 @@ action = function(host)
     return "" .. MTUS[m] .. " <= PMTU < " .. MTUS[m - 1]
   end
 end
-
diff --git a/scripts/pop3-ntlm-info.nse b/scripts/pop3-ntlm-info.nse
index 57660da61..9f401a390 100644
--- a/scripts/pop3-ntlm-info.nse
+++ b/scripts/pop3-ntlm-info.nse
@@ -1,7 +1,6 @@
 local comm = require "comm"
 local os = require "os"
 local datetime = require "datetime"
-local bin = require "bin"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
 local base64 = require "base64"
diff --git a/scripts/rmi-vuln-classloader.nse b/scripts/rmi-vuln-classloader.nse
index 3a737cde9..e677a8db1 100644
--- a/scripts/rmi-vuln-classloader.nse
+++ b/scripts/rmi-vuln-classloader.nse
@@ -1,4 +1,3 @@
-local bin = require "bin"
 local rmi = require "rmi"
 local shortport = require "shortport"
 local string = require "string"
diff --git a/scripts/smb-double-pulsar-backdoor.nse b/scripts/smb-double-pulsar-backdoor.nse
index 819fe0a57..b0b991dfe 100644
--- a/scripts/smb-double-pulsar-backdoor.nse
+++ b/scripts/smb-double-pulsar-backdoor.nse
@@ -1,4 +1,3 @@
-local bin = require "bin"
 local smb = require "smb"
 local vulns = require "vulns"
 local stdnse = require "stdnse"
diff --git a/scripts/smb-protocols.nse b/scripts/smb-protocols.nse
index 868e41ef7..ee352ec1c 100644
--- a/scripts/smb-protocols.nse
+++ b/scripts/smb-protocols.nse
@@ -1,6 +1,5 @@
 local smb = require "smb"
 local stdnse = require "stdnse"
-local string = require "string"
 local nmap = require "nmap"
 
 description = [[
@@ -23,8 +22,8 @@ script is the successor to the (removed) smbv2-enabled script.
 -- @usage nmap -p139 --script smb-protocols <target>
 --
 -- @output
--- | smb-protocols: 
--- |   dialects: 
+-- | smb-protocols:
+-- |   dialects:
 -- |     NT LM 0.12 (SMBv1) [dangerous, but default]
 -- |     2.02
 -- |     2.10
@@ -52,7 +51,7 @@ hostrule = function(host)
 end
 
 action = function(host,port)
-  local status, supported_dialects, overrides 
+  local status, supported_dialects, overrides
   local output = stdnse.output_table()
   overrides = {}
   status, supported_dialects = smb.list_dialects(host, overrides)
@@ -62,7 +61,7 @@ action = function(host,port)
         supported_dialects[i] = v .. " (SMBv1) [dangerous, but default]"
       end
     end
-    output.dialects = supported_dialects    
+    output.dialects = supported_dialects
   end
 
   if #output.dialects>0 then
diff --git a/scripts/smb-vuln-conficker.nse b/scripts/smb-vuln-conficker.nse
index 75987f4e7..60f6deec1 100644
--- a/scripts/smb-vuln-conficker.nse
+++ b/scripts/smb-vuln-conficker.nse
@@ -1,7 +1,6 @@
 local msrpc = require "msrpc"
 local nmap = require "nmap"
 local smb = require "smb"
-local stdnse = require "stdnse"
 local string = require "string"
 local table = require "table"
 local vulns = require "vulns"
diff --git a/scripts/smb-vuln-cve2009-3103.nse b/scripts/smb-vuln-cve2009-3103.nse
index b32ae8df3..e1be86776 100644
--- a/scripts/smb-vuln-cve2009-3103.nse
+++ b/scripts/smb-vuln-cve2009-3103.nse
@@ -1,8 +1,6 @@
-local msrpc = require "msrpc"
 local nmap = require "nmap"
 local smb = require "smb"
 local stdnse = require "stdnse"
-local string = require "string"
 local table = require "table"
 local vulns = require "vulns"
 
diff --git a/scripts/smb-vuln-ms06-025.nse b/scripts/smb-vuln-ms06-025.nse
index 791baf0a6..ea203bcd8 100644
--- a/scripts/smb-vuln-ms06-025.nse
+++ b/scripts/smb-vuln-ms06-025.nse
@@ -2,7 +2,6 @@ local msrpc = require "msrpc"
 local nmap = require "nmap"
 local smb = require "smb"
 local stdnse = require "stdnse"
-local string = require "string"
 local table = require "table"
 local vulns = require "vulns"
 
diff --git a/scripts/smb-vuln-ms08-067.nse b/scripts/smb-vuln-ms08-067.nse
index 95532264f..49326f344 100644
--- a/scripts/smb-vuln-ms08-067.nse
+++ b/scripts/smb-vuln-ms08-067.nse
@@ -1,7 +1,6 @@
 local msrpc = require "msrpc"
 local nmap = require "nmap"
 local smb = require "smb"
-local stdnse = require "stdnse"
 local string = require "string"
 local table = require "table"
 local vulns = require "vulns"
diff --git a/scripts/smb-vuln-regsvc-dos.nse b/scripts/smb-vuln-regsvc-dos.nse
index 6a154f56b..9af2c1433 100644
--- a/scripts/smb-vuln-regsvc-dos.nse
+++ b/scripts/smb-vuln-regsvc-dos.nse
@@ -1,8 +1,6 @@
 local msrpc = require "msrpc"
 local nmap = require "nmap"
 local smb = require "smb"
-local stdnse = require "stdnse"
-local string = require "string"
 local table = require "table"
 local vulns = require "vulns"
 
diff --git a/scripts/smb2-capabilities.nse b/scripts/smb2-capabilities.nse
index d5dfe476b..c1388b8e2 100644
--- a/scripts/smb2-capabilities.nse
+++ b/scripts/smb2-capabilities.nse
@@ -1,7 +1,6 @@
 local smb = require "smb"
 local smb2 = require "smb2"
 local stdnse = require "stdnse"
-local string = require "string"
 local table = require "table"
 local nmap = require "nmap"
 
@@ -26,10 +25,10 @@ References:
 -- @usage nmap -p 139 --script smb2-capabilities <target>
 --
 -- @output
--- | smb2-capabilities: 
--- |   2.02: 
+-- | smb2-capabilities:
+-- |   2.02:
 -- |     Distributed File System
--- |   2.10: 
+-- |   2.10:
 -- |     Distributed File System
 -- |     Leasing
 -- |     Multi-credit operations
@@ -54,7 +53,7 @@ hostrule = function(host)
 end
 
 action = function(host,port)
-  local status, smbstate, overrides 
+  local status, smbstate, overrides
   local output = stdnse.output_table()
   overrides = {}
 
diff --git a/scripts/smb2-security-mode.nse b/scripts/smb2-security-mode.nse
index 2bff35ea8..845a41d2d 100644
--- a/scripts/smb2-security-mode.nse
+++ b/scripts/smb2-security-mode.nse
@@ -1,7 +1,6 @@
 local smb = require "smb"
 local smb2 = require "smb2"
 local stdnse = require "stdnse"
-local string = require "string"
 local table = require "table"
 local nmap = require "nmap"
 
@@ -22,8 +21,8 @@ References:
 -- @usage nmap -p 139 --script smb2-security-mode <target>
 --
 -- @output
--- | smb2-security-mode: 
--- |   3.11: 
+-- | smb2-security-mode:
+-- |   3.11:
 -- |_    Message signing enabled but not required
 --
 -- @xmloutput
@@ -41,7 +40,7 @@ hostrule = function(host)
 end
 
 action = function(host,port)
-  local status, smbstate, overrides 
+  local status, smbstate, overrides
   local output = stdnse.output_table()
   overrides = overrides or {}
 
@@ -61,7 +60,7 @@ action = function(host,port)
       -- Signing configuration. SMBv2 servers support two flags:
       -- * Message signing enabled
       -- * Message signing required
-      local signing_enabled, signing_required 
+      local signing_enabled, signing_required
       if smbstate['security_mode'] & 0x01 == 0x01 then
         signing_enabled = true
       end
@@ -77,9 +76,9 @@ action = function(host,port)
         table.insert(message_signing, "Message signing is disabled and not required!")
       elseif not(signing_enabled) and signing_required then
         table.insert(message_signing, "Message signing is disabled!")
-      end      
-      output[stdnse.tohex(dialect[1], {separator = ".", group = 2})] = message_signing 
-      -- We exit after first accepted dialect, 
+      end
+      output[stdnse.tohex(dialect[1], {separator = ".", group = 2})] = message_signing
+      -- We exit after first accepted dialect,
       --  SMB signing configuration appears to be global so
       --  there is no point of trying other dialects.
       break
diff --git a/scripts/smtp-ntlm-info.nse b/scripts/smtp-ntlm-info.nse
index 29ae3f3f8..b331870fa 100644
--- a/scripts/smtp-ntlm-info.nse
+++ b/scripts/smtp-ntlm-info.nse
@@ -1,7 +1,6 @@
 local datetime = require "datetime"
 local os = require "os"
 local smtp = require "smtp"
-local bin = require "bin"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
 local base64 = require "base64"
diff --git a/scripts/snmp-brute.nse b/scripts/snmp-brute.nse
index 0c71362a1..f881c90a2 100644
--- a/scripts/snmp-brute.nse
+++ b/scripts/snmp-brute.nse
@@ -6,7 +6,6 @@ local packet = require "packet"
 local shortport = require "shortport"
 local snmp = require "snmp"
 local stdnse = require "stdnse"
-local string = require "string"
 local unpwdb = require "unpwdb"
 
 description = [[
@@ -269,4 +268,3 @@ action = function(host, port)
     stdnse.debug1("An error occurred: "..result.msg)
   end
 end
-
diff --git a/scripts/ssl-known-key.nse b/scripts/ssl-known-key.nse
index 5dd1fc150..f85dfe07b 100644
--- a/scripts/ssl-known-key.nse
+++ b/scripts/ssl-known-key.nse
@@ -2,7 +2,6 @@ local io = require "io"
 local nmap = require "nmap"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
-local string = require "string"
 local sslcert = require "sslcert"
 local tls = require "tls"
 
diff --git a/scripts/targets-ipv6-multicast-slaac.nse b/scripts/targets-ipv6-multicast-slaac.nse
index 2bf8dec49..4bf01c6ef 100644
--- a/scripts/targets-ipv6-multicast-slaac.nse
+++ b/scripts/targets-ipv6-multicast-slaac.nse
@@ -2,7 +2,6 @@ local coroutine = require "coroutine"
 local ipOps = require "ipOps"
 local math = require "math"
 local nmap = require "nmap"
-local os = require "os"
 local packet = require "packet"
 local stdnse = require "stdnse"
 local string = require "string"
diff --git a/scripts/wdb-version.nse b/scripts/wdb-version.nse
index 926591220..323806400 100644
--- a/scripts/wdb-version.nse
+++ b/scripts/wdb-version.nse
@@ -1,5 +1,3 @@
-local bin = require "bin"
-local bit = require "bit"
 local nmap = require "nmap"
 local rpc = require "rpc"
 local shortport = require "shortport"