bash printf leading 0

Is 0 or 1 true in bash?
In the context of Bash, 0 represents true, and 1 represents false.
This is a convention that comes from the Unix world, where a program that exits with 0 is considered to have completed successfully (true), and a non-zero exit code indicates an error (false).
What is a number with a leading 0 in bash?
Bash will interpret numbers with a leading zero as an octal number.
So, 08 -eq 99 doesn't make sense as there are no 8's in octal.
From “ARITHMETIC EVALUATION” in bash(1) : Constants with a leading 0 are interpreted as octal numbers._{1 sept. 2021}
In bash, ksh or zsh, you can use ksh's additional glob patterns to remove any number of leading 0 s.
In bash, run shopt -s extglob first.
In zsh, run setopt kshglob first.

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PDF	Advanced Bash-Scripting Guide 10?/03?/2014 Bash Variables Are ... strip_leading_zero () # Strip possible leading zero(s) ... This is the Bash builtin version of the /bin/printf or ...

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