SC2003 expr as octal to decimal converter

[ChillerDragon]

I try to increment numbers prefixed with zeros. I used expr to convert them to decimal. Because bash thinks they are octal:

$ x="0008"
$ echo "$((x + 1))"
-bash: 0008: value too great for base (error token is "0008")

$ echo "$(expr "$x" + 1)" # <- works but throws SC2003
9

[ChillerDragon]

Okay I solved it using:

$ shopt -s extglob
$ x="0008"
$ x="${x##+(0)}"
$ echo "$((x + 1))"
9

Maybe it is worth mentioning it at https://github.com/koalaman/shellcheck/wiki/SC2003

[mnuccioarpae]

As an alternative to removing the leading zeroes, you can specify the base for the number:

$ x=0008
$ echo $((10#$x + 1))
9

I have documented it on the wiki: https://github.com/koalaman/shellcheck/wiki/SC2003