Sed doesn't work as expected

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I understand sed will



  1. Applies all instructions on line 1, then line 2...

  2. Previous instructions may change the pattern space so the next instruction will operate on that modified pattern space (instead of the original text)

The example is:



sample.txt file



pig cow



Command



sed -e 's/pig/cow/; s/cow/horse/;' sample.txt



Expected Output



horse horse



Real Output



horse cow



The reason for my expected output is:



  1. First instruction substituted pig with cow in the pattern space

  2. Second instruction substituted 2 pigs with 2 horses in the pattern space





sed






share

























    up vote
    0
    down vote

    favorite












    I understand sed will



    1. Applies all instructions on line 1, then line 2...

    2. Previous instructions may change the pattern space so the next instruction will operate on that modified pattern space (instead of the original text)

    The example is:



    sample.txt file



    pig cow



    Command



    sed -e 's/pig/cow/; s/cow/horse/;' sample.txt



    Expected Output



    horse horse



    Real Output



    horse cow



    The reason for my expected output is:



    1. First instruction substituted pig with cow in the pattern space

    2. Second instruction substituted 2 pigs with 2 horses in the pattern space





    sed






    share























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I understand sed will



      1. Applies all instructions on line 1, then line 2...

      2. Previous instructions may change the pattern space so the next instruction will operate on that modified pattern space (instead of the original text)

      The example is:



      sample.txt file



      pig cow



      Command



      sed -e 's/pig/cow/; s/cow/horse/;' sample.txt



      Expected Output



      horse horse



      Real Output



      horse cow



      The reason for my expected output is:



      1. First instruction substituted pig with cow in the pattern space

      2. Second instruction substituted 2 pigs with 2 horses in the pattern space





      sed






      share













      I understand sed will



      1. Applies all instructions on line 1, then line 2...

      2. Previous instructions may change the pattern space so the next instruction will operate on that modified pattern space (instead of the original text)

      The example is:



      sample.txt file



      pig cow



      Command



      sed -e 's/pig/cow/; s/cow/horse/;' sample.txt



      Expected Output



      horse horse



      Real Output



      horse cow



      The reason for my expected output is:



      1. First instruction substituted pig with cow in the pattern space

      2. Second instruction substituted 2 pigs with 2 horses in the pattern space





      sed




      sed





      share












      share










      share



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      asked 3 mins ago









      Tran Triet

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