Dear GNU Parallel readers,
Is it possible to use --colsep with
multiple input files, without having to manually prefix each files' header
by a unique identifier for use in conjunction with --header?
For example, it would be
nice if with multiple files they could be automatically labelled
with a–z, with numerals still referring to their columns (the
reverse strikes me as better, but that would be counter-intuitive given
the present implementation).
Currently, the following works well (I
am using the latest version of GNU Parallel, 20170622, on
Linux 2.6.32-642.6.2.el6.x86_64):
parallel --header
--colsep "echo f1={f1} f2={f2} g1={g1} g2={g2}" :::: <(perl
-e 'printf "f1\tf2\nA\tB\nC\tD\n"') :::: <(perl -e 'printf
"g1\tg2\nE\tF\nG\tH\n"')
f1=A f2=B g1=E g2=F
f1=A f2=B g1=G g2=H
f1=C f2=D g1=E g2=F
f1=C f2=D g1=G g2=H
I would ideally like to be
able to do the following:
parallel --colsep "echo f1={a1} f2={a2}
g1={b1} g2={b2}" :::: <(perl -e 'printf
"f1\tf2\nA\tB\nC\tD\n"') :::: <(perl -e 'printf
"g1\tg2\nE\tF\nG\tH\n"')
Currently, the use of
--colsep
without --header for multiple files does not behave
as I would have expected:
parallel --colsep '\t' "echo f1={1} f2={2}
g1={1} g2={2}" :::: <(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=f1 g2=f2
f1=f1 f2=f2 g1=f1 g2=f2
f1=f1 f2=f2 g1=f1 g2=f2
f1=A f2=B g1=A g2=B
f1=A f2=B g1=A g2=B
f1=A f2=B g1=A g2=B
f1=C f2=D g1=C g2=D
f1=C f2=D g1=C g2=D
f1=C f2=D g1=C g2=D
It would be great to discuss possible
ways of achieving something like this. My main use-case is to allow GNU
Parallel to be used for complex self-joins, for which its convenient Perl
regex abilities and overall syntax are especially handy. It would be
particularly nice if replacement strings beyond {}
could still fully-supported when only using --colsep in the
above fashion.
Thank you for your consideration,
Coby
Viner
