Hi all

on study bash I 've got an other problem:

================================================== ======
test.sh
#!/bin/bash
if [ -z "$1" ]; then

# using pipe as input : awk $1 symbol is not sh's $1
# also ignore error checking here.

awk '{print $1 }'


else

echo $($1 | awk '{print $1}')

fi
================================================== ======




$echo "10 this is 10" | ./test.sh
10

but

../test.sh '10 this is 10'

do not work

how to do that in right grammar?

Hard to know what you are trying to do but play around with this.

#!/bin/bash
if [ -z "$1" ]; then

# using pipe as input : awk $1 symbol is not sh's $1
# also ignore error checking here.

awk '{print $1 }'

else

echo "$1" | awk '{print $1}'

fi

key9 wrote:
> Hi all
>
> on study bash I 've got an other problem:
>
> ================================================== ======
> test.sh
> #!/bin/bash
> if [ -z "$1" ]; then
>
> # using pipe as input : awk $1 symbol is not sh's $1
> # also ignore error checking here.
>
> awk '{print $1 }'
>
>
> else
>
> echo $($1 | awk '{print $1}')
>
> fi
> ================================================== ======
>
>
>
>
> $echo "10 this is 10" | ./test.sh
> 10
>
> but
>
> ./test.sh '10 this is 10'
>
> do not work
>
> how to do that in right grammar?

2006-12-7, 16:14(+08), key9:
> Hi all
>
> on study bash I 've got an other problem:
>
> ================================================== ======
> test.sh
> #!/bin/bash

Why call bash for an sh script? That's confusing even though
it'd OK.

> if [ -z "$1" ]; then

if [ "$#" -eq 0 ]

You were testing whether $1 was empty

>
> # using pipe as input : awk $1 symbol is not sh's $1
> # also ignore error checking here.
>
> awk '{print $1 }'
>
>
> else
>
> echo $($1 | awk '{print $1}')

printf '%s\n' "$@" | awk '{print $1}'

>
> fi
> ================================================== ======
[...]

If you replace #! /bin/bash with #! /bin/sh -
you remove the dependency on bash that is not needed here.

--
Stéphane

> Hard to know what you are trying to do but play around with this.

just study :-)

Sorry for my knowledge,

I understand things like Unix shell ,and UNIX desgin philosophy only 2 month
also I am not computer specialty

before that , when I want to solve some problem ,
I always using VBScripts.

and now I found another way- shell programming
pretty cool,like playing toy bricks.

so the situation is I have concept of what I want to solve (modeing),
but I have no idea how to do that in shell. especially in grammar details.

I think it's good news for me there's so much warmhearted people here
:-)

appreciate

key9 wrote:
> > Hard to know what you are trying to do but play around with this.
>
> just study :-)
>
> Sorry for my knowledge,
>
> I understand things like Unix shell ,and UNIX desgin philosophy only 2 month
> also I am not computer specialty
>
> before that , when I want to solve some problem ,
> I always using VBScripts.
>
> and now I found another way- shell programming
> pretty cool,like playing toy bricks.
>
> so the situation is I have concept of what I want to solve (modeing),
> but I have no idea how to do that in shell. especially in grammar details.
>
> I think it's good news for me there's so much warmhearted people here
> :-)
>
> appreciate

Are you trying to do something along these lines?
http://www.datasavantconsulting.com/...ripts/derprogs

> Are you trying to do something along these lines?
> http://www.datasavantconsulting.com/...ripts/derprogs

no , but that's a great :-) thank you
actually I want to design a mechanism which can simulate network node's
actions.

First I put everyting into a very large c++ application,

That almosted kill me. more than 200 classes which make one application and
accept input and get the resoult.
which still can not run ,I am sorry to say.

finally I got the idea : who cares how fast the scripts run , I just want
the simulate resoult to me judge the next step.

so shell scripting is the best way. since I've got no experience about shell
coding , so grammar will be the biggest problem.