Re: Different variable assignments

In article <lnuidqFk4dU1@mid.individual.net>,
Frank Winkler  <usenet@f.winkler-ka.de> wrote:

On 15.10.2024 13:46, I wrote:
>
 >The thing in question does
 >
 >tty=`tty`
 >sudo openconnect -b ... |\
 >  tee $tty | grep "^Session authentication will expire at" |\
 >  cut -d ' ' -f 7- | read end
 >
 >and this completely fails. Terminal output is missing, $end is empty and
 >the whole command doesn't seem to work. Without the last two lines, it's
 >working perfectly.
 >"sudo" also doesn't seem to be the problem as simple tests are working.
>

OK, let's try to normalize this.  But first, please tell which shell you
are targeting.  I.e., how much old-compatibility do you need?

I'm going to assume bash, but there isn't much difference.  In particular,
note that $() is POSIX, so you really don't need to ever mess with ``.

Also note: You do not need \ at the end of the line if the line ends with |
(also true for lines that end with || or && - and possibly others)

Anyway, this should do it:

    tty=$(tty)
    end="$(sudo openconnect -b ... |
tee $tty | grep "^Session authentication will expire at" |
cut -d ' ' -f 7-)"

Note also that the grep and the cut could be merged into a single
invocation of awk - but I don't know enough about what you're doing to be
more specific.  You can probably also eliminate all of the "tty" stuff by
writing either to /dev/tty (which is generic Unix) or /dev/stderr (which
might be Linux-specific).  Also, if you use gawk (GNU awk), then you can
write to /dev/stderr from within AWK and eliminate all of the "tee" stuff
as well.

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