test -t can distinguish compile sessions

test -t can distinguish compile sessions

[Dan Jacobson]

How can a shell script tell that we can't talk back, i.e. we are
either in a batch job or a emacs compile session? test -t doesn't
catch the latter, nor does test -t 0. case $- in *i*) isn't too
helpful either.  No, don't tell me how to talk back during compile
sessions, just tell me how to test... 
-- 
http://jidanni.org/ Taiwan(04)25854780

Re: test -t can distinguish compile sessions

[Robert Hundt]

Hey Dan,

I guess you would have to check the process tree (via ps -ef) and see
whether emacs is somwhere the parent of your current shell.

For example (on HP-UX, needs adjustment for your shell):

ps -ef | grep `ps -ef | grep $$ | grep ksh | grep -v grep | awk '{ print
$3 }' ` >out
cat out | grep -v /ksh | grep -v grep | grep /emacs
if [[ $? = 0 ]] then
   echo "We are emacs"
fi

-- Robert

"Dan Jacobson" <jidanni@jidanni.org> wrote in message
news:8765nc2i6n.fsf@jidanni.org...
> How can a shell script tell that we can't talk back, i.e. we are
> either in a batch job or a emacs compile session? test -t doesn't
> catch the latter, nor does test -t 0. case $- in *i*) isn't too
> helpful either.  No, don't tell me how to talk back during compile
> sessions, just tell me how to test...
> --
> http://jidanni.org/ Taiwan(04)25854780

Re: test -t can distinguish compile sessions

[Puff Addison]

Robert Hundt wrote:
> Hey Dan,
> 
> I guess you would have to check the process tree (via ps -ef) and see
> whether emacs is somwhere the parent of your current shell.
> 
> For example (on HP-UX, needs adjustment for your shell):
> 
> ps -ef | grep `ps -ef | grep $$ | grep ksh | grep -v grep | awk '{ print
> $3 }' ` >out
> cat out | grep -v /ksh | grep -v grep | grep /emacs
> if [[ $? = 0 ]] then
>    echo "We are emacs"
> fi
> 
> -- Robert
> 
> "Dan Jacobson" <jidanni@jidanni.org> wrote in message
> news:8765nc2i6n.fsf@jidanni.org...
> 
>>How can a shell script tell that we can't talk back, i.e. we are
>>either in a batch job or a emacs compile session? test -t doesn't
>>catch the latter, nor does test -t 0. case $- in *i*) isn't too
>>helpful either.  No, don't tell me how to talk back during compile
>>sessions, just tell me how to test...
>>--
>>http://jidanni.org/ Taiwan(04)25854780
> 
> 
> 
The tty command does this:
try
$ tty
and
$ cat | tty
^D

	Puff Addison