On 2013/11/19 14:10, Theo de Raadt wrote:
> In general, new non-standard options are bad.
>
> Basically, if we add this someone will use it in a script. Then it will
> become non-portable. You cannot just invent something on your own like
> this, without doing research to find out if someone else added a different
> option. I don't see evidence of that, so the gut answer is no.
Only FreeBSD/Dragonfly seem to use -u in tr. How about sed -u instead?
> > here is a diff that adds optional linebuffering to tr(1) with command
> > line switch -u like in sed(1). I need this to remove '\r' characters
> > from a continues input steam which lines have to be there immediately.
> >
> > Please write me if something is wrong with this diff or the change
> > itself. I will fix it.
> >
> > bye,
> > Jan
> >
> > Index: tr.1
> > ===================================================================
> > RCS file: /cvs/src/usr.bin/tr/tr.1,v
> > retrieving revision 1.20
> > diff -u -p -r1.20 tr.1
> > --- tr.1 14 Aug 2013 08:39:27 -0000 1.20
> > +++ tr.1 19 Nov 2013 20:46:33 -0000
> > @@ -41,18 +41,18 @@
> > .Nd translate characters
> > .Sh SYNOPSIS
> > .Nm tr
> > -.Op Fl cs
> > +.Op Fl csu
> > .Ar string1 string2
> > .Nm tr
> > -.Op Fl c
> > +.Op Fl cu
> > .Fl d
> > .Ar string1
> > .Nm tr
> > -.Op Fl c
> > +.Op Fl cu
> > .Fl s
> > .Ar string1
> > .Nm tr
> > -.Op Fl c
> > +.Op Fl cu
> > .Fl ds
> > .Ar string1 string2
> > .Sh DESCRIPTION
> > @@ -86,6 +86,14 @@ or
> > .Ar string2 )
> > in the input into a single instance of the character.
> > This occurs after all deletion and translation is completed.
> > +.It Fl u
> > +Force output to be line buffered,
> > +printing each line as it becomes available.
> > +By default, output is line buffered when standard output is a terminal
> > +and block buffered otherwise.
> > +See
> > +.Xr setbuf 3
> > +for a more detailed explanation.
> > .El
> > .Pp
> > In the first synopsis form, the characters in
> > @@ -284,6 +292,10 @@ The
> > utility is compliant with the
> > .St -p1003.1-2008
> > specification.
> > +.Pp
> > +The flag
> > +.Op Fl u
> > +is an extension to that specification.
> > .Pp
> > System V has historically implemented character ranges using the syntax
> > .Dq [c-c]
> > Index: tr.c
> > ===================================================================
> > RCS file: /cvs/src/usr.bin/tr/tr.c,v
> > retrieving revision 1.15
> > diff -u -p -r1.15 tr.c
> > --- tr.c 27 Oct 2009 23:59:46 -0000 1.15
> > +++ tr.c 19 Nov 2013 20:46:33 -0000
> > @@ -88,7 +88,7 @@ main(int argc, char *argv[])
> > int cflag, dflag, sflag, isstring2;
> >
> > cflag = dflag = sflag = 0;
> > - while ((ch = getopt(argc, argv, "cds")) != -1)
> > + while ((ch = getopt(argc, argv, "cdsu")) != -1)
> > switch((char)ch) {
> > case 'c':
> > cflag = 1;
> > @@ -99,6 +99,9 @@ main(int argc, char *argv[])
> > case 's':
> > sflag = 1;
> > break;
> > + case 'u':
> > + setlinebuf(stdout);
> > + break;
> > case '?':
> > default:
> > usage();
> > @@ -239,9 +242,9 @@ static void
> > usage(void)
> > {
> > fprintf(stderr,
> > - "usage: tr [-cs] string1 string2\n"
> > - " tr [-c] -d string1\n"
> > - " tr [-c] -s string1\n"
> > - " tr [-c] -ds string1 string2\n");
> > + "usage: tr [-csu] string1 string2\n"
> > + " tr [-cu] -d string1\n"
> > + " tr [-cu] -s string1\n"
> > + " tr [-cu] -ds string1 string2\n");
> > exit(1);
> > }
> >
>
