Remove SSIDs without name in iwlist wlan scan

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In Raspbian when I'm running command iwlist wlan0 scan | grep ESSID i'm getting results without SSID on it like below 



 ESSID:"OpenWrt"
 ESSID:"dlink"
 ESSID:"tplink"
 ESSID:"linksys"
 ESSID:"tenda"
 ESSID:"pi"
 ESSID:""
 ESSID:"somessid"
 ESSID:""
 ESSID:"router"
 ESSID:""
 ESSID:""
 ESSID:""


I don't why I getting this blank SSID lines. my work environment may have some hidden network. not sure. but I need to remove this before send to front end processing. how can I achieve this




awk raspbian wpa-supplicant iwlwifi wpa-cli




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    up vote
    1
    down vote

    favorite












    In Raspbian when I'm running command iwlist wlan0 scan | grep ESSID i'm getting results without SSID on it like below 



     ESSID:"OpenWrt"
     ESSID:"dlink"
     ESSID:"tplink"
     ESSID:"linksys"
     ESSID:"tenda"
     ESSID:"pi"
     ESSID:""
     ESSID:"somessid"
     ESSID:""
     ESSID:"router"
     ESSID:""
     ESSID:""
     ESSID:""


    I don't why I getting this blank SSID lines. my work environment may have some hidden network. not sure. but I need to remove this before send to front end processing. how can I achieve this




    awk raspbian wpa-supplicant iwlwifi wpa-cli




    share|improve this question






















      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      In Raspbian when I'm running command iwlist wlan0 scan | grep ESSID i'm getting results without SSID on it like below 



       ESSID:"OpenWrt"
       ESSID:"dlink"
       ESSID:"tplink"
       ESSID:"linksys"
       ESSID:"tenda"
       ESSID:"pi"
       ESSID:""
       ESSID:"somessid"
       ESSID:""
       ESSID:"router"
       ESSID:""
       ESSID:""
       ESSID:""


      I don't why I getting this blank SSID lines. my work environment may have some hidden network. not sure. but I need to remove this before send to front end processing. how can I achieve this




      awk raspbian wpa-supplicant iwlwifi wpa-cli




      share|improve this question












      In Raspbian when I'm running command iwlist wlan0 scan | grep ESSID i'm getting results without SSID on it like below 



       ESSID:"OpenWrt"
       ESSID:"dlink"
       ESSID:"tplink"
       ESSID:"linksys"
       ESSID:"tenda"
       ESSID:"pi"
       ESSID:""
       ESSID:"somessid"
       ESSID:""
       ESSID:"router"
       ESSID:""
       ESSID:""
       ESSID:""


      I don't why I getting this blank SSID lines. my work environment may have some hidden network. not sure. but I need to remove this before send to front end processing. how can I achieve this





      awk raspbian wpa-supplicant iwlwifi wpa-cli





      share|improve this question











      share|improve this question




      share|improve this question










      asked Oct 29 '17 at 8:52









      charith

      15710




      15710




















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          $ iwlist wlan0 scan | grep 'ESSID:"..*"'
           ESSID:"OpenWrt"
           ESSID:"dlink"
           ESSID:"tplink"
           ESSID:"linksys"
           ESSID:"tenda"
           ESSID:"pi"
           ESSID:"somessid"
           ESSID:"router"



          • . meta character matches any character


          • .* will match zero or more characters

          • Can also use grep -E 'ESSID:".+"' which will match at least one character between the double quotes





          share|improve this answer
















          • 1




            Working perfectly fine !! thanks
            – charith
            Oct 29 '17 at 9:23










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          $ iwlist wlan0 scan | grep 'ESSID:"..*"'
           ESSID:"OpenWrt"
           ESSID:"dlink"
           ESSID:"tplink"
           ESSID:"linksys"
           ESSID:"tenda"
           ESSID:"pi"
           ESSID:"somessid"
           ESSID:"router"



          • . meta character matches any character


          • .* will match zero or more characters

          • Can also use grep -E 'ESSID:".+"' which will match at least one character between the double quotes





          share|improve this answer
















          • 1




            Working perfectly fine !! thanks
            – charith
            Oct 29 '17 at 9:23














          up vote
          2
          down vote



          accepted










          $ iwlist wlan0 scan | grep 'ESSID:"..*"'
           ESSID:"OpenWrt"
           ESSID:"dlink"
           ESSID:"tplink"
           ESSID:"linksys"
           ESSID:"tenda"
           ESSID:"pi"
           ESSID:"somessid"
           ESSID:"router"



          • . meta character matches any character


          • .* will match zero or more characters

          • Can also use grep -E 'ESSID:".+"' which will match at least one character between the double quotes





          share|improve this answer
















          • 1




            Working perfectly fine !! thanks
            – charith
            Oct 29 '17 at 9:23












          up vote
          2
          down vote



          accepted







          up vote
          2
          down vote



          accepted






          $ iwlist wlan0 scan | grep 'ESSID:"..*"'
           ESSID:"OpenWrt"
           ESSID:"dlink"
           ESSID:"tplink"
           ESSID:"linksys"
           ESSID:"tenda"
           ESSID:"pi"
           ESSID:"somessid"
           ESSID:"router"



          • . meta character matches any character


          • .* will match zero or more characters

          • Can also use grep -E 'ESSID:".+"' which will match at least one character between the double quotes





          share|improve this answer












          $ iwlist wlan0 scan | grep 'ESSID:"..*"'
           ESSID:"OpenWrt"
           ESSID:"dlink"
           ESSID:"tplink"
           ESSID:"linksys"
           ESSID:"tenda"
           ESSID:"pi"
           ESSID:"somessid"
           ESSID:"router"



          • . meta character matches any character


          • .* will match zero or more characters

          • Can also use grep -E 'ESSID:".+"' which will match at least one character between the double quotes






          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Oct 29 '17 at 9:04









          Sundeep

          6,9611826




          6,9611826







          • 1




            Working perfectly fine !! thanks
            – charith
            Oct 29 '17 at 9:23












          • 1




            Working perfectly fine !! thanks
            – charith
            Oct 29 '17 at 9:23







          1




          1




          Working perfectly fine !! thanks
          – charith
          Oct 29 '17 at 9:23




          Working perfectly fine !! thanks
          – charith
          Oct 29 '17 at 9:23

















           

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