Hi. I am currently redirecting output from a bash script by doing this
in the script:

{
....bash commands..
} > "$filename" 2>&1

I now would like to add the option to also display onto the standard
output. So I I'd do something like this:

{
....bash commands..
} 2>&1 | tee "$filename"

The problem I am having, though, is that I'd like to have a script
option that will let the user choose one or the other. I tried having
a variable like this:

redirection_descriptor="> ${filename} 2>&1"

or

redirection_descriptor="2>&1 | tee ${filename}"

based on the user's option. Then I tried to do this:

{
....bash commands..
} $redirection_descriptor

but that gave me a syntax error on $redirection_descriptor.

Any suggestions how to do this?

Thanks!

Ken

2006-12-1, 14:58(-08), kk_oop@yahoo.com:
> Hi. I am currently redirecting output from a bash script by doing this
> in the script:
>
> {
> ...bash commands..
> } > "$filename" 2>&1
>
> I now would like to add the option to also display onto the standard
> output. So I I'd do something like this:
>
> {
> ...bash commands..
> } 2>&1 | tee "$filename"
>
> The problem I am having, though, is that I'd like to have a script
> option that will let the user choose one or the other. I tried having
> a variable like this:
[...]

Easiest is probably to do something like:

main () {
...bash commands...
}

if [ "$opt_t" = true ]; then
main 2>&1 | tee -- "$filename"
else
main > "$filename" 2>&1
fi

You could also do:

if [ "$opt_t" = true ]; then
logging() {
tee -- "$filename"
}
else
logging() {
cat > "$filename"
}
fi

{
...bash commands...
} 2>&1 | logging

But that means your bash commands standard output will be a pipe
even when that could have been avoided.

--
Stéphane