Remove even numbered lines of text file












3














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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  • 1




    Possible duplicate of Print odd-numbered lines, print even-numbered lines
    – don_crissti
    22 mins ago
















3














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.
















  • 1




    Possible duplicate of Print odd-numbered lines, print even-numbered lines
    – don_crissti
    22 mins ago














3












3








3


1





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









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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 39 mins ago









Sparhawk

9,27363991




9,27363991






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.









asked 54 mins ago









logvca

161




161




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.





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.






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








  • 1




    Possible duplicate of Print odd-numbered lines, print even-numbered lines
    – don_crissti
    22 mins ago














  • 1




    Possible duplicate of Print odd-numbered lines, print even-numbered lines
    – don_crissti
    22 mins ago








1




1




Possible duplicate of Print odd-numbered lines, print even-numbered lines
– don_crissti
22 mins ago




Possible duplicate of Print odd-numbered lines, print even-numbered lines
– don_crissti
22 mins ago










2 Answers
2






active

oldest

votes


















3














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
    49 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

86850343

89381968

89714939

90124775

91408453



$ perl -ne '$.%2 && print' file

86850343

89381968

89714939

90124775

91408453



$ perl -ne 'print if $.%2' file

86850343

89381968

89714939

90124775

91408453



$ perl -ne 'not $.%2 && print' file

86850343

89381968

89714939

90124775

91408453





share|improve this answer























  • Heh, the first 3 of those give incorrect output based on the question; the fourth gives the right result :-)
    – Stephen Harris
    21 mins ago










  • @StephenHarris eeeek! Completely fumbled that one. Thanks for the heads up, fixed now.
    – terdon♦
    10 mins ago











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2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes









3














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
    49 mins ago
















3














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
    49 mins ago














3












3








3






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 44 mins ago

























answered 52 mins ago









steeldriver

34.4k35083




34.4k35083












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


















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
















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




Thanks! Works fine!!!
– logvca
49 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

86850343

89381968

89714939

90124775

91408453



$ perl -ne '$.%2 && print' file

86850343

89381968

89714939

90124775

91408453



$ perl -ne 'print if $.%2' file

86850343

89381968

89714939

90124775

91408453



$ perl -ne 'not $.%2 && print' file

86850343

89381968

89714939

90124775

91408453





share|improve this answer























  • Heh, the first 3 of those give incorrect output based on the question; the fourth gives the right result :-)
    – Stephen Harris
    21 mins ago










  • @StephenHarris eeeek! Completely fumbled that one. Thanks for the heads up, fixed now.
    – terdon♦
    10 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

86850343

89381968

89714939

90124775

91408453



$ perl -ne '$.%2 && print' file

86850343

89381968

89714939

90124775

91408453



$ perl -ne 'print if $.%2' file

86850343

89381968

89714939

90124775

91408453



$ perl -ne 'not $.%2 && print' file

86850343

89381968

89714939

90124775

91408453





share|improve this answer























  • Heh, the first 3 of those give incorrect output based on the question; the fourth gives the right result :-)
    – Stephen Harris
    21 mins ago










  • @StephenHarris eeeek! Completely fumbled that one. Thanks for the heads up, fixed now.
    – terdon♦
    10 mins ago














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

86850343

89381968

89714939

90124775

91408453



$ perl -ne '$.%2 && print' file

86850343

89381968

89714939

90124775

91408453



$ perl -ne 'print if $.%2' file

86850343

89381968

89714939

90124775

91408453



$ 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

86850343

89381968

89714939

90124775

91408453



$ perl -ne '$.%2 && print' file

86850343

89381968

89714939

90124775

91408453



$ perl -ne 'print if $.%2' file

86850343

89381968

89714939

90124775

91408453



$ perl -ne 'not $.%2 && print' file

86850343

89381968

89714939

90124775

91408453






share|improve this answer














share|improve this answer



share|improve this answer








edited 11 mins ago

























answered 49 mins ago









terdon♦

128k31249423




128k31249423












  • Heh, the first 3 of those give incorrect output based on the question; the fourth gives the right result :-)
    – Stephen Harris
    21 mins ago










  • @StephenHarris eeeek! Completely fumbled that one. Thanks for the heads up, fixed now.
    – terdon♦
    10 mins ago


















  • Heh, the first 3 of those give incorrect output based on the question; the fourth gives the right result :-)
    – Stephen Harris
    21 mins ago










  • @StephenHarris eeeek! Completely fumbled that one. Thanks for the heads up, fixed now.
    – terdon♦
    10 mins ago
















Heh, the first 3 of those give incorrect output based on the question; the fourth gives the right result :-)
– Stephen Harris
21 mins ago




Heh, the first 3 of those give incorrect output based on the question; the fourth gives the right result :-)
– Stephen Harris
21 mins ago












@StephenHarris eeeek! Completely fumbled that one. Thanks for the heads up, fixed now.
– terdon♦
10 mins ago




@StephenHarris eeeek! Completely fumbled that one. Thanks for the heads up, fixed now.
– terdon♦
10 mins ago










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