Re: GNU Parallel Bug Reports The wierd output from total_jobs function

[Ole Tange]

On Mon, Sep 9, 2019 at 2:36 PM Daniel Zhang <address@hidden> wrote:

> $ echo -e "A\tB\tC" | parallel echo '{} {= $_=total_jobs() =}'
> A B C 1
> $ echo -e "A\tB\tC" | parallel --colsep '\t' echo '{} {= $_=total_jobs() =}'
> A B C 1 1 1
>
> Why the output of total_jobs() is 1 1 1 ?

It is due to this:

  echo -e "A\tB\tC" | parallel --colsep '\t' echo '{} {}'

which is the same as this:

  echo -e "A\tB\tC" | parallel --colsep '\t' echo '{} {= =}'

which is the same as this:

  echo -e "A\tB\tC" | parallel --colsep '\t' echo '{} {= $_=$_ =}'

The {= =} is evaluated for each argument and with three arguments it
is inserted three times.

So how do you get it only once? This way:

  echo -e "A\tB\tC" | parallel --colsep '\t' echo '{} {=1 $_=total_jobs() =}'

Can we make an (semi real) example for the man page where we use
multiple arguments, and the positional argument in a command?


/Ole