Re: "echo $((0x))" is accepted, treated as 0x0
Andreas Schwab <[email protected]>
| Newsgroups | gmane.comp.shells.bash.bugs |
|---|---|
| Message-ID | <[email protected]> |
On Jan 24 2026, Martin D Kealey wrote: > On Sat, 24 Jan 2026 at 12:10, Denys Vlasenko <[email protected]> wrote: > >> Subject: "echo $((0x))" is accepted, treated as 0x0 >> The subject says it all. > > > Working as intended and as documented. The docs say "Integer constants follow the C language definition" and 0x is not valid C. > This is so that "echo $((0x$foo))" works as intended when foo contains only > hexadecimal digits. Note that the empty string complies with that > requirement. It's a weak argument, you can always use 0x0$foo if foo can be empty. -- Andreas Schwab, [email protected] GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 "And now for something completely different."