Re: Integrating Unix scripting in Cocoa app
Re: Integrating Unix scripting in Cocoa app
- Subject: Re: Integrating Unix scripting in Cocoa app
- From: Ron Fleckner <email@hidden>
- Date: Tue, 7 Aug 2007 22:30:19 +1000
On 07/08/2007, at 10:01 PM, Kevin Kuehl wrote:
--- Ron Fleckner <email@hidden> wrote:
At the moment, I'm assuming
that the shebang line is the FIRST line of the
script which makes it
easy to find.
The '#!" not only has to be on the first line, the two
characters also have to be the first two in the file.
They are a special case for UNIX magic numbers.
Please see: http://en.wikipedia.org/wiki/Sha-bang for
more information.
My question: Do people ever write shell scripts
without a shebang
line or where the shebang line is NOT the first line
of the script?
The only time I ever leave it out of shell scripts is
when I write code fragments that are not to be
executed on their own. For example, if a script is
meant to be sourced into another one, I'll leave it
out as a reminder not to try to execute the script.
If '#!' are not the first two characters in a file,
there's not much you can do. If you can determine
it's a text file, you could probably try sending it to
/bin/sh and see what happens. I don't think making
the demand that the script either starts with a '#!'
or is a /bin/sh script is too unreasonable. There is
a lot of history to support this choice.
Kevin Kuehl
email@hidden
Thanks, Kevin. I thought that having '#!' as the first two
characters was required, but needed to check whether that was indeed
the case. I agree that having them there is not an onerous
requirement for the type of user who would be writing scripts. I
haven't yet tried out a shell script. I'll have to have a look for
an example of "Hello world" for each of bash, sh, ksh &etc to see if
they work as well.
Ron
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