Re: Warn about long lines

[Ralph Corderoy]

Hi Alejandro,

> >      ! groff -Tutf8 -man -ww longline.man |
> >      expand |
> >      grep '^.\{80\}.'
>
> Ahh, I forgot about \{N\}, since I never use it.
>
> Still, the Makefile uses pipefail, so I'm not sure how to make grep(1)
> work for this.  If it works, it would be nice.

Move the inversion along the pipeline with a subshell.

    $ awk '{print FILENAME, length}' *
    79 79
    80 80
    81 81
    $
    $ set -o pipefail
    $ false | (! grep '^.\{80\}.' 79); echo $?
    1
    $ false | (! grep '^.\{80\}.' 80); echo $?
    1
    $ false | (! grep '^.\{80\}.' 81); echo $?
    
.................................................................................
    1
    $
    $ true | (! grep '^.\{80\}.' 79); echo $?
    0
    $ true | (! grep '^.\{80\}.' 80); echo $?
    0
    $ true | (! grep '^.\{80\}.' 81); echo $?
    
.................................................................................
    1
    $

-- 
Cheers, Ralph.