How get last commnda history line number directly

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Subject	How get last commnda history line number directly
Date	Tue, 1 Sep 2020 02:14:33 -0700 (MST)
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How to get last commnda history line number purely & directly on bash script
or prompt ?

as it's pure & directly viable in PS1 env. var.
PS1=`echo \!`

confusingly bash 'mainstream' itself wasn't found way to do




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How get last commnda history line number directly almahdi <budikusasi@gmail.com> - 2020-09-01 02:14 -0700

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