Remove even numbered lines of text file












2














I have a text file on a Linux system, and would like to remove every second line, which is "even" numbered. Example: I would like to remove the second line of the file, the fourth, sixth, eighth line, and so on, until you complete filtering of the file completely.



file.txt



86850343

88065952

89381968

89536251

89714939

89826424

90124775

90672109

91408453

92438737


I would like this output:



86850343

89381968

89714939

90124775

91408453


Any help will be very welcome.
Thank you.






text-processing awk sed







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    2














    I have a text file on a Linux system, and would like to remove every second line, which is "even" numbered. Example: I would like to remove the second line of the file, the fourth, sixth, eighth line, and so on, until you complete filtering of the file completely.



    file.txt



    86850343
    
88065952
    
89381968
    
89536251
    
89714939
    
89826424
    
90124775
    
90672109
    
91408453
    
92438737


    I would like this output:



    86850343
    
89381968
    
89714939
    
90124775
    
91408453


    Any help will be very welcome.
    Thank you.






    text-processing awk sed







    share|improve this question









    New contributor




    logvca is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.























      2












      2








      2







      I have a text file on a Linux system, and would like to remove every second line, which is "even" numbered. Example: I would like to remove the second line of the file, the fourth, sixth, eighth line, and so on, until you complete filtering of the file completely.



      file.txt



      86850343
      
88065952
      
89381968
      
89536251
      
89714939
      
89826424
      
90124775
      
90672109
      
91408453
      
92438737


      I would like this output:



      86850343
      
89381968
      
89714939
      
90124775
      
91408453


      Any help will be very welcome.
      Thank you.






      text-processing awk sed







      share|improve this question









      New contributor




      logvca is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      I have a text file on a Linux system, and would like to remove every second line, which is "even" numbered. Example: I would like to remove the second line of the file, the fourth, sixth, eighth line, and so on, until you complete filtering of the file completely.



      file.txt



      86850343
      
88065952
      
89381968
      
89536251
      
89714939
      
89826424
      
90124775
      
90672109
      
91408453
      
92438737


      I would like this output:



      86850343
      
89381968
      
89714939
      
90124775
      
91408453


      Any help will be very welcome.
      Thank you.






      text-processing awk sed




      text-processing awk sed






      share|improve this question









      New contributor




      logvca is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question









      New contributor




      logvca is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|improve this question




      share|improve this question








      edited 14 mins ago









      Sparhawk

      9,27363991




      9,27363991






      New contributor




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      asked 29 mins ago









      logvca

      111




      111




      New contributor




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      New contributor





      logvca is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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          2 Answers
          2






          active

          oldest

          votes


















          2














          With GNU Sed's n-skip-m notation:



          $ sed '2~2d' file.txt
          
86850343
          
89381968
          
89714939
          
90124775
          
91408453





          share|improve this answer























          • Thanks! Works fine!!!
            – logvca
            24 mins ago



















          2














          You can't really beat sed for this sort of thing, but here are some other options:



          $ awk 'NR%2==0' file
          
88065952
          
89536251
          
89826424
          
90672109
          
92438737
          

          
$ perl -ne 'print if $.%2==0' file
          
88065952
          
89536251
          
89826424
          
90672109
          
92438737
          
$ perl -ne 'print unless $.%2' file
          
88065952
          
89536251
          
89826424
          
90672109
          
92438737
          
$ perl -ne 'not $.%2 && print' file
          
86850343
          
89381968
          
89714939
          
90124775
          
91408453





          share|improve this answer























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            2 Answers
            2






            active

            oldest

            votes








            2 Answers
            2






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            2














            With GNU Sed's n-skip-m notation:



            $ sed '2~2d' file.txt
            
86850343
            
89381968
            
89714939
            
90124775
            
91408453





            share|improve this answer























            • Thanks! Works fine!!!
              – logvca
              24 mins ago
















            2














            With GNU Sed's n-skip-m notation:



            $ sed '2~2d' file.txt
            
86850343
            
89381968
            
89714939
            
90124775
            
91408453





            share|improve this answer























            • Thanks! Works fine!!!
              – logvca
              24 mins ago














            2












            2








            2






            With GNU Sed's n-skip-m notation:



            $ sed '2~2d' file.txt
            
86850343
            
89381968
            
89714939
            
90124775
            
91408453





            share|improve this answer














            With GNU Sed's n-skip-m notation:



            $ sed '2~2d' file.txt
            
86850343
            
89381968
            
89714939
            
90124775
            
91408453






            share|improve this answer














            share|improve this answer



            share|improve this answer








            edited 19 mins ago

























            answered 26 mins ago









            steeldriver

            34.4k35083




            34.4k35083












            • Thanks! Works fine!!!
              – logvca
              24 mins ago


















            • Thanks! Works fine!!!
              – logvca
              24 mins ago
















            Thanks! Works fine!!!
            – logvca
            24 mins ago




            Thanks! Works fine!!!
            – logvca
            24 mins ago













            2














            You can't really beat sed for this sort of thing, but here are some other options:



            $ awk 'NR%2==0' file
            
88065952
            
89536251
            
89826424
            
90672109
            
92438737
            

            
$ perl -ne 'print if $.%2==0' file
            
88065952
            
89536251
            
89826424
            
90672109
            
92438737
            
$ perl -ne 'print unless $.%2' file
            
88065952
            
89536251
            
89826424
            
90672109
            
92438737
            
$ perl -ne 'not $.%2 && print' file
            
86850343
            
89381968
            
89714939
            
90124775
            
91408453





            share|improve this answer




























              2














              You can't really beat sed for this sort of thing, but here are some other options:



              $ awk 'NR%2==0' file
              
88065952
              
89536251
              
89826424
              
90672109
              
92438737
              

              
$ perl -ne 'print if $.%2==0' file
              
88065952
              
89536251
              
89826424
              
90672109
              
92438737
              
$ perl -ne 'print unless $.%2' file
              
88065952
              
89536251
              
89826424
              
90672109
              
92438737
              
$ perl -ne 'not $.%2 && print' file
              
86850343
              
89381968
              
89714939
              
90124775
              
91408453





              share|improve this answer


























                2












                2








                2






                You can't really beat sed for this sort of thing, but here are some other options:



                $ awk 'NR%2==0' file
                
88065952
                
89536251
                
89826424
                
90672109
                
92438737
                

                
$ perl -ne 'print if $.%2==0' file
                
88065952
                
89536251
                
89826424
                
90672109
                
92438737
                
$ perl -ne 'print unless $.%2' file
                
88065952
                
89536251
                
89826424
                
90672109
                
92438737
                
$ perl -ne 'not $.%2 && print' file
                
86850343
                
89381968
                
89714939
                
90124775
                
91408453





                share|improve this answer














                You can't really beat sed for this sort of thing, but here are some other options:



                $ awk 'NR%2==0' file
                
88065952
                
89536251
                
89826424
                
90672109
                
92438737
                

                
$ perl -ne 'print if $.%2==0' file
                
88065952
                
89536251
                
89826424
                
90672109
                
92438737
                
$ perl -ne 'print unless $.%2' file
                
88065952
                
89536251
                
89826424
                
90672109
                
92438737
                
$ perl -ne 'not $.%2 && print' file
                
86850343
                
89381968
                
89714939
                
90124775
                
91408453






                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited 10 mins ago

























                answered 24 mins ago









                terdon♦

                128k31249423




                128k31249423






















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