Re: value too great for base (error token is "0008")
On Tue, Nov 03, 2009 at 05:37:45PM -0700, Bob Proulx wrote:
> Dobromir Romankiewicz wrote:
> > bash: 0008: value too great for base (error token is "0008").
> Numbers with leading zeros are read as octal constants. Octal is
> composed of '0' through '7'. The number '8' is too large to be an
> octal number.
>
> $ echo $((0008))
> bash: 0008: value too great for base (error token is "0008")
>
> To have the number read as a decimal number the leading zeros must be
> removed.
>
> $ echo $((8))
> 8
If removing the leading zeroes would be difficult for you, then you can
force the arithmetic expression to use base 10 by prefixing the variable
with "10#". Thus:
month=$(date +%m) # Can produce "08" etc.
next_month=$(( (10#$month == 12) ? 1 : 10#$month+1 ))
echo $next_month
On the other hand, removing a single leading zero is not difficult:
month=$(date +%m) month=${month#0} # Removing leading 0
next_month=$(( ($month == 12) ? 1 : $month+1 ))
Removing multiple leading zeroes, however, requires either a loop, or the
use of extended globs. A variant of this question (removing leading/trailing
spaces) appears at . Although it
looks like someone removed my loop solution... grrr.
> Note also that the use of $[expression] for $((expression)) is
> documented as deprecated and to be removed in a future version.
> Better to use $((expression)) instead.
$((...)) is also POSIX-compliant. Please do switch.
Re: value too great for base (error token is "0008")
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According to Greg Wooledge on 11/4/2009 6:23 AM:
> On the other hand, removing a single leading zero is not difficult:
>
> month=$(date +%m) month=${month#0} # Removing leading 0
Not portable. Assigning the same variable twice in the same statement has
different order of operations in some shells. Use:
month=$(date +%m); month=${month#0}
instead.
> next_month=$(( ($month == 12) ? 1 : $month+1 ))
>
> Removing multiple leading zeroes, however, requires either a loop, or the
> use of extended globs.
Not true. You can do it via POSIX and without a loop by using an
intermediate variable:
foo=00081
bar=${foo%%[!0]*}
foo=${foo#$bar}}
- --
Don't work too hard, make some time for fun as well!
Eric Blake e...@byu.net
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Re: value too great for base (error token is "0008")
On Wed, 4 Nov 2009, Eric Blake wrote:
> According to Greg Wooledge on 11/4/2009 6:23 AM:
> > On the other hand, removing a single leading zero is not difficult:
> >
> > month=$(date +%m) month=${month#0} # Removing leading 0
>
> Not portable. Assigning the same variable twice in the same statement has
> different order of operations in some shells. Use:
>
> month=$(date +%m); month=${month#0}
>
> instead.
>
> > next_month=$(( ($month == 12) ? 1 : $month+1 ))
> >
> > Removing multiple leading zeroes, however, requires either a loop, or the
> > use of extended globs.
>
> Not true. You can do it via POSIX and without a loop by using an
> intermediate variable:
>
> foo=00081
> bar=${foo%%[!0]*}
> foo=${foo#$bar}}
Or even without an intermediate variable:
foo=${foo#${foo%%[!0]*}}
(Though I prefer the variable for legibility.)
--
Chris F.A. Johnson, webmaster
===
Author:
Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)
Pro Bash Programming: Scripting the GNU/Linux Shell (2009, Apress)
