* Stephane Chazelas wrote on Sun, Nov 02, 2008 at 09:53:15AM CET: > On Sat, Nov 01, 2008 at 11:21:01PM -0000, Sven Mascheck wrote: > [...] > > >>>> : > stdout > stderr > [...] > > > It fails on old Ultrix sh, which can't redirect the same fd more than once > > > in a single statement. But that platform is relatively dead these days. > > > > More detailed: > > > > - It actually works (also on Ultrix) but it is not robust > > in any traditional Bourne shell (except where fixed by the vendor): > > > > $ echo x y > file1 > file2 # ok, all output in file2 > > $ echo x > file1 y > file2 # not ok, all output in file1 instead of > > file2
IIRC then the Ultrix shell also output an undesirable warning, but I don't know whether that was in conjunction with eval only. Quoting autoconf.info: | When catering to old systems, don't redirect the same file descriptor | several times, as you are doomed to failure under Ultrix. | | ULTRIX V4.4 (Rev. 69) System #31: Thu Aug 10 19:42:23 GMT 1995 | UWS V4.4 (Rev. 11) | $ eval 'echo matter >fullness' >void | illegal io | $ eval '(echo matter >fullness)' >void | illegal io | $ (eval '(echo matter >fullness)') >void | Ambiguous output redirect. Cheers, Ralf
