> Whether POSIX applies or not, from a logical standpoint history number
> and custom bash escape expansion should be last, after parameter
> expansion and command substitution because doing it first breaks
> command substitution (see my earlier post) or using variables in a
> prompt (a='!'; PS1='
On 19 Okt., 02:56, Chet Ramey wrote:
> Second, there are a couple of problems with Posix and this construct.
> You can make an argument that Posix doesn't apply, since it only
> calls for parameter expansion on the value of PS1, and that does not
> include command substitution. Even if it does ap
Nils wrote:
> PS1='$( [ "${LOGNAME}" != root ] && color=green )'
>
> works in ksh93 and POSIX shell but fails in bash as bash seems to
> expand the "!" to the next history file number before doing command
> substitution. Setting PS1='$( [ "${LOGNAME}" !!= root ] &&
> color=green )' preserves the "
