GNU Parallel --plus Capabilities

[Larry Ploetz]

Feature request:

Given the (second) command below, line 3 would be more like bash if it substituted all periods with underscores (instead of none due to no match):

> $ parallel --version
> GNU parallel 20220522
> Copyright (C) 2007-2022 Ole Tange, http://ole.tange.dk and Free Software
> Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <https://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: https://www.gnu.org/software/parallel
>
> When using programs that use GNU Parallel to process data for publication
> please cite as described in 'parallel --citation'.
> $ echo a.b.c | parallel --plus 'var={}; echo -e bash var:\\t\\t$var; echo -e parallel single:\\t{/\./_}; echo -e parallel all:\\t\\t{//\./_}; echo -e bash single:\\t\\t${var/./_}; echo -e bash all:\\t\\t${var//./_}' | cat -n
>      1  bash var:               a.b.c
>      2  parallel single:        a_b.c
>      3  parallel all:           a.b.c
>      4  bash single:            a_b.c
>      5  bash all:               a_b_c
>

There are probably other nuances of bash parameter expansion that could be included in GNU Parallel.

Thanks,
· Larry