On 13/08/2021, Karl Berry <k...@freefriends.org> wrote: > When combining variable assignments with a shell command, some older > shells (notably heirloom-sh and presumably also Solaris 10 /bin/sh) > > Just to confirm: Solaris 10 /bin/sh does indeed also have this bug. > > sparcsol$ /bin/sh -c 'x=good; x=bad :; echo $x' > bad > $ uname -a > SunOS sparcsol 5.10 Generic_150400-48 sun4v sparc SUNW,T5240 > > Debian 11 dash apparently does also, which seems surprising to me.
This is my error, it is an incorrect demonstration of the problem because : is actually not a regular built-in, but rather it is a special built-in. POSIX specifies the dash behaviour, but not all shells implement this rule for special built-ins (e.g., bash does not unless run in POSIX compatibility mode). A better example using a regular built-in instead: % dash -c 'x=good; x=bad echo; echo $x' [blank line] good % jsh -c 'x=good; x=bad echo; echo $x' [blank line] bad I can spin a v2 patch with a new log message. Cheers, Nick
