Solution looking for (more than one) problem

[Ole Tange]

I like Bash's removal of strings:

  $ file=my.tar.gz
  $ echo ${file%.tar.gz}
  my

So far the --rpl strings are fixed. There is no way to "pass an
argument". I have changed that:

  parallel --rpl '{%(.*?)} s/$$1//' echo {%.tar.gz} ::: my.tar.gz

To ask for an argument you put '(regexp)' in the replacement string,
and you access them using $$1 $$2 ...

The --rpl can of course be put in ~/.parallel/config

This can also take multiple arguments:

  parallel --rpl '{@(\d+)\S(\d+)\S(\d+)}
   if($$3 > 31) { ($$1,$$2,$$3) = ($$3,$$2,$$1) }
   if($$2 > 12) { ($$1,$$2,$$3) = ($$1,$$3,$$2) }
   $$1 = ($$1%100 + 1900); $_="$$1-$$2-$$3"
  ' echo {@99-12-31} {@12.31.99} {@31/12-1999} ::: a

  parallel --rpl '{(.*?)/(.*?)} $_="$$2$_$$1"' echo {swap/these} ::: -middle-

But those are pretty stupid examples. Can you find a use where
multiple arguments would make sense?

Also it would be helpful if you could read the --rpl section in the
manual. Can this be described better?


/Ole