On 6/29/21 4:21 PM, L A Walsh wrote: > I hope a basic question isn't too offtopic.
Well, if you don't think this is a bug in bash, but something you need
help figuring out, maybe you'd prefer to use the "help-bash" list?
> Say I have some number of jobs running:
>
>> jobs|wc -l
> 3
> ---
> in a function (have tried shopt -s/-u lastpipe; neither way worked)
> njobs() {
> jobs |wc -l
> }
>> njobs
> 3
>
> Would like to pass a varname to njobs to store the answer in, like:
> njobs() {
> jobs|wc -l
> #magic puts val in $v
> printf {$1:+-v $1} "%s\n" "$v"
This is obviously broken, because {$1:+expand} isn't how bash works. Try
swapping the "{" and the "$"...
> }
>
> So I can run:
>
>> njobs n
> echo "$n"
> 3
>
> -----------
> How can I put the output into '$v'
> *without* using a temporary file?
>
> This seems so basic, yet its eluding me.
> Could someone throw me a clue-stick?
> Tnx!
What's wrong with the obvious
v=$(jobs | wc -l)
> p.s. - a trivial util func producing jobs:
>
> resleep() { alias my="declare " int="my -i "
> int n=${1:-3} t=${2:-99}; echo "$n jobs @ ${t}s:"
> while ((0 < n--)); do sleep "$t" & done; }
>
>
>
>
>
--
Eli Schwartz
Arch Linux Bug Wrangler and Trusted User
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