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01-Shebang.md

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Shebang

  • Lets understand Shebang

  • In this lecture we will understand the types of shell, Bourne Shell(sh), Bourne again Shell(bash), C Shell, Z Shell etc..

  • A Shebang statement is a line that you specify at the top of the shell script and is used to specify what shell a script must run in.

  • Shebang instructs the shell to use a particular shell or interpreter for the script, below case tells us that the script should run in the bash shell

    bash

    Bourne again Shell

    • Bourne again Shell, it will print the sequence as expected. It will generate the sequence 0 to 10

      ba

    Bourne Shell or Debian Almquist Shell(dash)

    • Bourne Shell, if you try to run the same script in dash shell, it doesnt know how to expand this expression into a seuqnce of numbers

      b

    • Bourne Shell is, in fact, the(bash) shell itself, it is linked to the (bash).

      dash

    Other Shell

    • If you want to run the script from another shell, thats not a(bash) shel, then you must just run it through the(bash) shell by prefixing the bash command

      o