Date: Tue, 14 Aug 2001 19:12:14 -0400 From: parv <parv_@yahoo.com> To: Drew Tomlinson <drewt@writeme.com> Cc: "FreeBSD Questions (E-mail)" <freebsd-questions@FreeBSD.org> Subject: Re: Shell Script Help - Comparing Strings Message-ID: <20010814191214.A55329@moo.holy.cow> In-Reply-To: <5CD46247635BD511B6B100A0CC3F023925A069@ldcmsx01.lc.ca.gov>; from drewt@writeme.com on Tue, Aug 14, 2001 at 03:43:31PM -0700 References: <5CD46247635BD511B6B100A0CC3F023925A069@ldcmsx01.lc.ca.gov>
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this was, on the fateful occasion around Aug 14 18:43 -0400,
sent by Drew Tomlinson
>
> As I continue in writing my first shell script, I can't figure out how to
> compare strings properly. For example, I want to run my script and pass an
> argument to it from the command line. However, if this argument is not
> passed, then I want to set it to a defined value. I'm trying to use the if
> statement for this. Here's a clip of my code:
>
> #! /bin/sh -vx
>
> # 8/8/01
> # An attempt to write script to run webalizer to generate web stats for all
> # virtual web sites.
>
> # Set command line variables. $1 = web to run.
>
> # Set $1 to "www" if blank.
> echo $1
> if ["$1"=""]
> then $1 = "www"
> fi
...
> echo $1
> + echo test
> test
> if ["$1"=""]
> then $1 = "www"
> fi
> + [test=]
> [test=]: not found
...
you need to add spaces between test operators...
if [ "$1"="" ] # notice the difference
then
$1="www"
fi
...but i would test the number of arguments, and set a non positional
variable instead...
case $# in
0)
suffix=www
;;
*)
suffix=$1
;;
esac
...but still better alternative, would be...
suffix=${1:-www}
--
so, do you like word games or scrabble?
- parv
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