On Sun, Feb 13, 2005 at 03:25:18PM +0100, Marco d'Itri wrote: > 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.
Do you have an example where such a test on $PS1 is used? I'm unsure whether it's good to encourage such behavior if it's not based on any standard, and works only with a few shells. Thanks, Gerrit. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
