testing tty in script

QNX Newsgroups (Archives) qnx.newuser
1

Hi All,

I’ve added a bind command to my .kshrc so I can use TAB for filename
completion. The relevant lines are:

TTY=$(tty)
if test “$TTY” != “not a tty”; then bind ‘^I’=complete; fi

It works fine when opening a new Pterm window (tty = “/dev/ttyp*”), and when
running make from PhAB (“not a tty”).

However, under some circumstances, it issues the error:

/bin/sh: /home/pscarter/.kshrc[31]: bind: cannot bind, not a tty.

sh is actually a symlink to ksh. The error occurs when running a shell
script in a pterm ("/dev/ttyp*"), when running make from a pterm
("/dev/ttyp*"), and when running a shell script in text mode ("/dev/con*")

How can I properly check if .kshrc is being run as a script rather than a
terminal session?

Many thanks
Neil

Neil Carter Psychology Department
IT Technician University of Wales Swansea
Wales, United Kingdom

http://psy.swansea.ac.uk/staff/Carter/

2

I test for the interactive script flag at the beginning of my .kshrc, eg

case $- in
i)

set -o emacs

export EDITOR=vi
export VISUAL=vi
export PS1=’hostname -s:/bin/pwd >’

bind ^[[z=list
bind ^I=complete

…

esac

University of Wales Swansea: Psychology Technicians wrote:

Hi All,

I’ve added a bind command to my .kshrc so I can use TAB for filename
completion. The relevant lines are:

TTY=$(tty)
if test “$TTY” != “not a tty”; then bind ‘^I’=complete; fi

It works fine when opening a new Pterm window (tty = “/dev/ttyp*”), and when
running make from PhAB (“not a tty”).

However, under some circumstances, it issues the error:

/bin/sh: /home/pscarter/.kshrc[31]: bind: cannot bind, not a tty.

sh is actually a symlink to ksh. The error occurs when running a shell
script in a pterm ("/dev/ttyp*"), when running make from a pterm
("/dev/ttyp*"), and when running a shell script in text mode ("/dev/con*")

How can I properly check if .kshrc is being run as a script rather than a
terminal session?

Many thanks
Neil

Neil Carter Psychology Department
IT Technician University of Wales Swansea
Wales, United Kingdom

http://psy.swansea.ac.uk/staff/Carter/

–
cburgess@qnx.com

3

“Colin Burgess” <cburgess@qnx.com> wrote in message
news:c3evpp$51c$1@inn.qnx.com…

I test for the interactive script flag at the beginning of my .kshrc, eg
case $- in
i)
…
esac

Thanks Colin,

I can find no mention of the interactive script flag anywhere in
HelpViewer’s ksh entry. Am I looking in the wrong place? I’d like to learn
more about it.

Cheers,
Neil

Neil Carter Psychology Department
IT Technician University of Wales Swansea
Wales, United Kingdom

http://psy.swansea.ac.uk/staff/Carter/

4

It’s a little hard to find, but check the “Parameters” section - this
explains that $- is a concatenation of all the ‘set’ single letter options.

University of Wales Swansea: Psychology Technicians wrote:

“Colin Burgess” <> cburgess@qnx.com> > wrote in message
news:c3evpp$51c$> 1@inn.qnx.com> …

I test for the interactive script flag at the beginning of my .kshrc, eg
case $- in
i)
…
esac


Thanks Colin,

I can find no mention of the interactive script flag anywhere in
HelpViewer’s ksh entry. Am I looking in the wrong place? I’d like to learn
more about it.

Cheers,
Neil

Neil Carter Psychology Department
IT Technician University of Wales Swansea
Wales, United Kingdom

http://psy.swansea.ac.uk/staff/Carter/

–
cburgess@qnx.com

5

University of Wales Swansea: Psychology Technicians <pstech@swansea.ac.uk> wrote:

“Colin Burgess” <> cburgess@qnx.com> > wrote in message
news:c3evpp$51c$> 1@inn.qnx.com> …
I test for the interactive script flag at the beginning of my .kshrc, eg
case $- in
i)
…
esac

Thanks Colin,

I can find no mention of the interactive script flag anywhere in
HelpViewer’s ksh entry. Am I looking in the wrong place? I’d like to learn
more about it.

I’ve added this stuff to the Neutrino User’s Guide (for 6.3).

Steve Reid stever@qnx.com
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