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Hi.

The post by tange ( the author of parallel -- History of GNU Parallel - GNU Project - Free Software Foundation (http://www.gnu.org/software/parallel/history.html) ) says install, but, for me,...

That's a blind spot. It's sad to say it, but the only truly portable way to do date math in UNIX is Perl.

GNU date is fantastic if you have it:

$ date -d "today - 1 day" +%Y-%m-%d
...

You got it right - almost - but missed by a hairs width.

Any command (like "s", etc.) can be preceeded by a range clause. A range clause can be either a range of lines, determined by line numbers...

It's a pattern (which is always true) without any action. You can replace it with any non-zero number. As the default action in awk is to print, this will output each input record (if control reaches...

Of course it is. Bash isn't a shell well suited to scripting at all IMHO and should be avoided at all costs.

I suspect you are on an AIX system (btw. always say which system you work on - they all...

That is not correct. It is undefined whether A or B starts first. They might start at the exactly the same time if there are multiple cpu's. A pipe can hold an undefined but finite amount of...