GNU Parallel Bug Reports env_parallel is unable to accept input via process substitution

[Coby Viner]

env_parallel is unable to accept input via process substitution.

Example error text:

parallel: Error: Cannot open input file `/dev/fd/63': No such file or directory.

 

Ran env_parallel --install and env_parallel --record-env, prior to running the below commands.

Parallel version (latest):

address@hidden:~] parallel --version

GNU parallel 20170622
Copyright (C) 2007,2008,2009,2010,2011,2012,2013,2014,2015,2016,2017
Ole Tange and Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
This is free software: you are free to change and redistribute it.
GNU parallel comes with no warranty.

Web site: http://www.gnu.org/software/parallel

When using programs that use GNU Parallel to process data for publication
please cite as described in 'parallel --citation'.

address@hidden:~] 

address@hidden:~] env_parallel --version

GNU parallel 20170622
Copyright (C) 2007,2008,2009,2010,2011,2012,2013,2014,2015,2016,2017
Ole Tange and Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
GNU parallel comes with no warranty.

Web site: http://www.gnu.org/software/parallel

When using programs that use GNU Parallel to process data for publication
please cite as described in 'parallel --citation'.

address@hidden:~] 

 

Error example:

Failing case 1:

address@hidden:~] env_parallel --colsep '\t' "echo f1={1} f2={2} g1={3} g2={4}" :::: <(perl -e 'printf "f1\tf2\nA\tB\nC\tD\n"') :::: <(perl -e 'printf "g1\tg2\nE\tF\nG\tH\n"')
parallel: Error: Cannot open input file `/dev/fd/63': No such file or directory.

address@hidden:~] 

 

Failing case 2 (i.e. it still fails with --env _):

address@hidden:~] env_parallel --env _ --colsep '\t' "echo f1={1} f2={2} g1={3} g2={4}" :::: <(perl -e 'printf "f1\tf2\nA\tB\nC\tD\n"') :::: <(perl -e 'printf "g1\tg2\nE\tF\nG\tH\n"')
parallel: Error: Cannot open input file `/dev/fd/63': No such file or directory.

address@hidden:~] 

 

Passing case:

address@hidden:~] parallel --colsep '\t' "echo f1={1} f2={2} g1={3} g2={4}" :::: <(perl -e 'printf "f1\tf2\nA\tB\nC\tD\n"') :::: <(perl -e 'printf "g1\tg2\nE\tF\nG\tH\n"')
f1=f1 f2=f2 g1=g1 g2=g2
f1=f1 f2=f2 g1=E g2=F
f1=f1 f2=f2 g1=G g2=H
f1=A f2=B g1=g1 g2=g2
f1=A f2=B g1=E g2=F
f1=A f2=B g1=G g2=H
f1=C f2=D g1=g1 g2=g2
f1=C f2=D g1=E g2=F
f1=C f2=D g1=G g2=H

 

address@hidden:~] 

 

Platform:

address@hidden:~] uname -a

Linux mordor 2.6.32-642.6.2.el6.x86_64 #1 SMP Wed Oct 26 06:52:09 UTC 2016 x86_64 GNU/Linux

address@hidden:~] 

Description:

env_parallel does not appear able to accept input via process substitution from the parent shell. Perhaps this is prohibitively difficult to accomplish?

Thanks,

Coby