Background mode not spawn a subshell, how could it execute without interupting

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I am testing if the background mode create a sub-shell



$ num=100; echo $num &
[1] 5873
100
[1]+ Done echo $num

$ echo $num
100


It indicates the $num is accessible from the current shell, verify it not a sub-shell.



If not a subshell, how could it execute without interrupting the current shell?






bash






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    up vote
    0
    down vote

    favorite












    I am testing if the background mode create a sub-shell



    $ num=100; echo $num &
    [1] 5873
    100
    [1]+ Done echo $num

    $ echo $num
    100


    It indicates the $num is accessible from the current shell, verify it not a sub-shell.



    If not a subshell, how could it execute without interrupting the current shell?






    bash






    share







    New contributor




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





















      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I am testing if the background mode create a sub-shell



      $ num=100; echo $num &
      [1] 5873
      100
      [1]+ Done echo $num

      $ echo $num
      100


      It indicates the $num is accessible from the current shell, verify it not a sub-shell.



      If not a subshell, how could it execute without interrupting the current shell?






      bash






      share







      New contributor




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











      I am testing if the background mode create a sub-shell



      $ num=100; echo $num &
      [1] 5873
      100
      [1]+ Done echo $num

      $ echo $num
      100


      It indicates the $num is accessible from the current shell, verify it not a sub-shell.



      If not a subshell, how could it execute without interrupting the current shell?






      bash




      bash





      share







      New contributor




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










      share







      New contributor




      avirate is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      share



      share






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

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