The ksh builtin grep apparently doesn't support "-" as an option-argument to the -f option:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ $ cut -f 1 -d ' ' pattern_file | grep -Ff - file grep: -: cannot open [No such file or directory] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >From my interpretation of POSIX.1-2008, it doesn't look like the -f option is required to support reading the pattern_file from standard input in the event of an "-" option-argument. bsdgrep (at least the version in FreeBSD 9.2) and /usr/xpg4/bin/grep from Solaris 11.2-beta also don't support it, though GNU grep does. -- Nathan Weeks IT Specialist USDA-ARS Corn Insects and Crop Genetics Research Unit Crop Genome Informatics Laboratory Iowa State University http://weeks.public.iastate.edu/ On Fri, Jun 20, 2014 at 11:00 AM, <[email protected]> wrote: > Message: 3 > Date: Fri, 20 Jun 2014 15:54:54 +0100 > From: Peter Hitchman <[email protected]> > Cc: AST / Korn Shell Users List <[email protected]> > Subject: Re: [ast-users] ksh hang on pipeline with builtin cut and > grep > Message-ID: > <CAK7tHSzCpDSiPFSmCCu93DDS6daVoCPe0ih_pjkheLV=tom...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Hi > How about instead of /dev/stdin you just use a "-"? > > e.g. cut -f 1 -d ' ' pattern_file | grep -Ff - file > > Regards > Pete > > > On 20 June 2014 15:41, Nathan Weeks <[email protected]> wrote: > >> I'm seeing a rather odd hang with ksh 2014-06-06 on OS X 10.7.5 when using >> the builtin cut and grep in a pipeline: >> >> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >> $ type cut >> cut is a shell builtin version of /usr/bin/cut >> $ type grep >> grep is a shell builtin version of /usr/bin/grep >> $ cat pattern_file >> x11 x12 >> $ cat file >> x11 >> x21 >> $ cut -f 1 -d ' ' pattern_file | grep -Ff /dev/stdin file >> ...hang... >> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >> >> Using dtrace to get a stack trace of the ksh process during the hang >> reveals >> the following: >> >> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >> $ sudo dtruss -sp 7646 >> Password: >> SYSCALL(args) = return >> mmap(0x1E0962C49000, 0x700800000, 0x3, 0x1002, 0xFFFFFFFF, 0x6) >> = 0x62C49000 0 >> >> libsystem_kernel.dylib`__mmap+0xa >> ksh`_vmsegalloc+0x5b4 >> ksh`bestpackextend+0x1fb >> ksh`bestpackalloc+0x379 >> ksh`bestalloc+0x245 >> ksh`bestresize+0x7d2 >> ksh`_ast_realloc+0x117 >> ksh`_sfexcept+0x3ff >> ksh`sfwr+0x75a >> ksh`_sfflsbuf+0x1b5 >> ksh`sfputr+0x1f8 >> ksh`addre+0x301 >> ksh`compile+0x2fe >> ksh`grep+0xb0f >> ksh`b_grep+0x1d2 >> ksh`sh_exec+0x2286 >> ksh`sh_exec+0x467a >> ksh`sh_exec+0x53e8 >> ksh`exfile+0xe5b >> ksh`sh_main+0x126a >> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >> >> -- >> Nathan Weeks >> IT Specialist >> USDA-ARS Corn Insects and Crop Genetics Research Unit >> Crop Genome Informatics Laboratory >> Iowa State University >> http://weeks.public.iastate.edu/ >> _______________________________________________ >> ast-users mailing list >> [email protected] >> http://lists.research.att.com/mailman/listinfo/ast-users >> > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.research.att.com/pipermail/ast-users/attachments/20140620/609d5536/attachment-0001.html> > > ------------------------------ > > _______________________________________________ > ast-users mailing list > [email protected] > http://lists.research.att.com/mailman/listinfo/ast-users > > > End of ast-users Digest, Vol 124, Issue 8 > ***************************************** _______________________________________________ ast-users mailing list [email protected] http://lists.research.att.com/mailman/listinfo/ast-users
