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Difference between > and >> when used with a named pipe


Difference between > and | with /dev/ttycontinuous reading from named pipe (cat or tail -f)Why does my named pipe keep getting modified?Pipe Named Fiforedirect to a named pipeDifference between 1> and >Difference between 2>&1 <command> and <command> 2>&1Change buffer size of named pipedifference between 2>&1 | tee output.log and |& tee output.logwhat is the difference between >&2 and &>2






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;








5















Is there any difference between the two redirections in the following code?



mkfifo foo
echo > foo 
echo >> foo





io-redirection fifo







share|improve this question



















  • 1





    mkfifo: difference between > and >> would look clearer

    – jsotola
    8 hours ago

















5















Is there any difference between the two redirections in the following code?



mkfifo foo
echo > foo 
echo >> foo





io-redirection fifo







share|improve this question



















  • 1





    mkfifo: difference between > and >> would look clearer

    – jsotola
    8 hours ago













5












5








5


1






Is there any difference between the two redirections in the following code?



mkfifo foo
echo > foo 
echo >> foo





io-redirection fifo







share|improve this question
















Is there any difference between the two redirections in the following code?



mkfifo foo
echo > foo 
echo >> foo





io-redirection fifo




io-redirection fifo






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 7 hours ago









Kusalananda♦

149k18284471




149k18284471










asked 8 hours ago









Olegzandr DenmanOlegzandr Denman

1392




1392







  • 1





    mkfifo: difference between > and >> would look clearer

    – jsotola
    8 hours ago












  • 1





    mkfifo: difference between > and >> would look clearer

    – jsotola
    8 hours ago







1




1





mkfifo: difference between > and >> would look clearer

– jsotola
8 hours ago





mkfifo: difference between > and >> would look clearer

– jsotola
8 hours ago










2 Answers
2






active

oldest

votes


















7














There should be no difference. The >> will open the fifo with the O_APPEND flag, and that shouldn't make any difference on a fifo or other non-seekable file.



However, there are buggy interfaces like sendfile(2) in Linux, which do not work with files opened in O_APPEND mode, and will object even to non-seekable files having that mode set, so you better always use the > form.






share|improve this answer
































    -1














    > overwrites the destination file



    >> appends to the destination file



    Thanks to Jobin at AskUbuntu for the authoritative answer with 45 likes.






    share|improve this answer


















    • 1





      Notice that the redirections are used with a named pipe in the question, not a regular file. The question is whether > and >> has the same effect.

      – Kusalananda♦
      7 hours ago












    Your Answer








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    2 Answers
    2






    active

    oldest

    votes








    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    7














    There should be no difference. The >> will open the fifo with the O_APPEND flag, and that shouldn't make any difference on a fifo or other non-seekable file.



    However, there are buggy interfaces like sendfile(2) in Linux, which do not work with files opened in O_APPEND mode, and will object even to non-seekable files having that mode set, so you better always use the > form.






    share|improve this answer





























      7














      There should be no difference. The >> will open the fifo with the O_APPEND flag, and that shouldn't make any difference on a fifo or other non-seekable file.



      However, there are buggy interfaces like sendfile(2) in Linux, which do not work with files opened in O_APPEND mode, and will object even to non-seekable files having that mode set, so you better always use the > form.






      share|improve this answer



























        7












        7








        7







        There should be no difference. The >> will open the fifo with the O_APPEND flag, and that shouldn't make any difference on a fifo or other non-seekable file.



        However, there are buggy interfaces like sendfile(2) in Linux, which do not work with files opened in O_APPEND mode, and will object even to non-seekable files having that mode set, so you better always use the > form.






        share|improve this answer















        There should be no difference. The >> will open the fifo with the O_APPEND flag, and that shouldn't make any difference on a fifo or other non-seekable file.



        However, there are buggy interfaces like sendfile(2) in Linux, which do not work with files opened in O_APPEND mode, and will object even to non-seekable files having that mode set, so you better always use the > form.







        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited 7 hours ago

























        answered 8 hours ago









        mosvymosvy

        12.7k11543




        12.7k11543























            -1














            > overwrites the destination file



            >> appends to the destination file



            Thanks to Jobin at AskUbuntu for the authoritative answer with 45 likes.






            share|improve this answer


















            • 1





              Notice that the redirections are used with a named pipe in the question, not a regular file. The question is whether > and >> has the same effect.

              – Kusalananda♦
              7 hours ago
















            -1














            > overwrites the destination file



            >> appends to the destination file



            Thanks to Jobin at AskUbuntu for the authoritative answer with 45 likes.






            share|improve this answer


















            • 1





              Notice that the redirections are used with a named pipe in the question, not a regular file. The question is whether > and >> has the same effect.

              – Kusalananda♦
              7 hours ago














            -1












            -1








            -1







            > overwrites the destination file



            >> appends to the destination file



            Thanks to Jobin at AskUbuntu for the authoritative answer with 45 likes.






            share|improve this answer













            > overwrites the destination file



            >> appends to the destination file



            Thanks to Jobin at AskUbuntu for the authoritative answer with 45 likes.







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered 8 hours ago









            K7AAYK7AAY

            1,7851029




            1,7851029







            • 1





              Notice that the redirections are used with a named pipe in the question, not a regular file. The question is whether > and >> has the same effect.

              – Kusalananda♦
              7 hours ago













            • 1





              Notice that the redirections are used with a named pipe in the question, not a regular file. The question is whether > and >> has the same effect.

              – Kusalananda♦
              7 hours ago








            1




            1





            Notice that the redirections are used with a named pipe in the question, not a regular file. The question is whether > and >> has the same effect.

            – Kusalananda♦
            7 hours ago






            Notice that the redirections are used with a named pipe in the question, not a regular file. The question is whether > and >> has the same effect.

            – Kusalananda♦
            7 hours ago


















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