On Feb 13, Gerrit Pape <[EMAIL PROTECTED]> wrote: > On Sat, Feb 12, 2005 at 02:56:51PM +0100, Marco d'Itri wrote: > > Checking if $PS1 is defined is a popular way to determine if a shell is > > an interactive shell, or a program has been started from an interactive > > shell. But dash always sets the variable. > I cannot read from the standards that $PS1 must not be set in a > non-interactive shell; I found posh and ksh behave the same as dash. Even if it's not a standardized behaviour, I think that it's still a popular behaviour worth supporting.
> A reliable way to check whether a shell is interactive or not is to look > for the options flag character i in $-. This does not work for scripts run from the shell. -- ciao, Marco
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