tcl - how do i make a variable unique -

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how make variable unique in tcl?

example:

exec echo $msgbody - /tmp/alert_notify_work.$$ exec cat /home/hci/alert.txt -- /tmp/alert_notify_work.$$

this not work; trying make variable alert_notify_work unique.

it's best use pre-existing library this. tcllib has fileutil package implements tempfiles:

set filename [fileutil::tempfile alert_notify_work.]

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