Distinguish a command not a native second transmitter

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This question might be frivolous but it is haunting me long.



suppose



[root@iz2ze9wve43n2nyuvmsfx5z /]# find . -maxdepth 2 -type d | ls
bin dev home lib64 media opt root sbin sys usr
boot etc lib lost+found mnt proc run srv tmp var


ls did nothing, as a rescue I should reconstruct them to a list to ls



find . -type d | xargs ls
#millions of outputs


However, grep does a good job



[root@iz2ze9wve43n2nyuvmsfx5z /]# find . -maxdepth 2 -type d | grep home
./home


How could I distinguish a command was not born as a second transmitter from underly understanding rather than trying, error test and remember.






bash






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    up vote
    0
    down vote

    favorite












    This question might be frivolous but it is haunting me long.



    suppose



    [root@iz2ze9wve43n2nyuvmsfx5z /]# find . -maxdepth 2 -type d | ls
    bin dev home lib64 media opt root sbin sys usr
    boot etc lib lost+found mnt proc run srv tmp var


    ls did nothing, as a rescue I should reconstruct them to a list to ls



    find . -type d | xargs ls
    #millions of outputs


    However, grep does a good job



    [root@iz2ze9wve43n2nyuvmsfx5z /]# find . -maxdepth 2 -type d | grep home
    ./home


    How could I distinguish a command was not born as a second transmitter from underly understanding rather than trying, error test and remember.






    bash






    share























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      This question might be frivolous but it is haunting me long.



      suppose



      [root@iz2ze9wve43n2nyuvmsfx5z /]# find . -maxdepth 2 -type d | ls
      bin dev home lib64 media opt root sbin sys usr
      boot etc lib lost+found mnt proc run srv tmp var


      ls did nothing, as a rescue I should reconstruct them to a list to ls



      find . -type d | xargs ls
      #millions of outputs


      However, grep does a good job



      [root@iz2ze9wve43n2nyuvmsfx5z /]# find . -maxdepth 2 -type d | grep home
      ./home


      How could I distinguish a command was not born as a second transmitter from underly understanding rather than trying, error test and remember.






      bash






      share













      This question might be frivolous but it is haunting me long.



      suppose



      [root@iz2ze9wve43n2nyuvmsfx5z /]# find . -maxdepth 2 -type d | ls
      bin dev home lib64 media opt root sbin sys usr
      boot etc lib lost+found mnt proc run srv tmp var


      ls did nothing, as a rescue I should reconstruct them to a list to ls



      find . -type d | xargs ls
      #millions of outputs


      However, grep does a good job



      [root@iz2ze9wve43n2nyuvmsfx5z /]# find . -maxdepth 2 -type d | grep home
      ./home


      How could I distinguish a command was not born as a second transmitter from underly understanding rather than trying, error test and remember.






      bash




      bash





      share












      share










      share



      share










      asked 1 min ago









      Sawajiri

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