What is the function of the following lines at the top of a shell script file: Directory and Script? Post: 302972303

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Top Forums Shell Programming and Scripting What is the function of the following lines at the top of a shell script file: Directory and Script? Post 302972303 by Aia on Wednesday 4th of May 2016 12:47:36 AM

05-04-2016

Registered User

Quote:

Originally Posted by remytom

The file starts like this:

Code:

Directory: <path to the script>
Script: <script fife name>

#!bin/ksh

##Comments

<actual script>

What is the use of the first two lines in the script? What if I save the file without them? What will be the effect? They are not comments. Im very new to this, please help!

The first line of a script should be the shebang #! which it says what program is supposed to run the script when you make the file executable and run it as ./script.sh

However the script can be run as:
ksh script.sh

If you remove the shebang that's the only option you have.
Anything that starts with just a # (except the #!, when is the first line) will be ignored as commands. They are just human readable comments.

I am assuming that the following does not exist in your actual script, since that will be incorrect.

Code:

Directory: <path to the script>
Script: <script fife name>

Note that your #!bin/ksh should be #!/bin/ksh if your ksh shell lives there.

Last edited by Aia; 05-04-2016 at 01:56 AM..

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LEARN ABOUT PHP

times

times(1)                                                           User Commands                                                          times(1)

NAME

       times - shell built-in function to report time usages of the current shell

SYNOPSIS

   sh
       times

   ksh
       times

DESCRIPTION

   sh
       Print the accumulated user and system times for processes run from the shell.

   ksh
       Print the accumulated user and system times for the shell and for processes run from the shell.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words,  following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
           able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation  are  not
           performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       ksh(1), sh(1), time(1), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                           times(1)