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Full Discussion: Script/cron error
Top Forums UNIX for Dummies Questions & Answers Script/cron error Post 22871 by killerserv on Wednesday 12th of June 2002 06:41:44 AM
Old 06-12-2002
The not-a-typewriter error is caused by running commands where there is no controlling tty device; that is, no interactive terminal is present. This would be true for a script that runs in cron or has su - to run a batch job.

To prevent this, you need to start with /etc/profile and test for an interactive tty device as in:
Code:
case $- in

            *i* ) export INTERACTIVE=/sbin/true

                              ;;

                        * ) export INTERACTIVE=/sbin/false

                              ;;

esac

While this may seem cryptic, the shell understands whether it is interactive or not and sets a flag (the i flag). The construct $- returns all the current flags that are set as a string and if the letter i appears in the string, the shell is interactive. Another way is to test the terminal device with the tty(1) command as in:
Code:
if tty -s

then

         export TTY=/sbin/true

else

         export TTY=/sbin/false

fi

The choice of $TTY or $INTERACTIVE is arbitrary as far as names. In your /etc/profile (and .profile, etc.), you can then test for interactive terminal prior to any settings that affect the terminal. A few of the common commands are: stty, tput, and tabs. Here is an example:
Code:
if [ $TTY ]

then

     /sbin/stty erase "^H" kill "^U"

     /sbin/stty intr "^C" eof "^D"

     /sbin/stty -parity ixoff

     /sbin/stty susp \^Z dsusp \^Y

if [ -x /usr/bin/tabs ]

then

     /usr/bin/tabs

else

     echo "$0: The command \"/usr/bin/

               tabs\" was not found."

 fi

 

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LEARN ABOUT MOJAVE

profile

profile(4)                                                         File Formats                                                         profile(4)

NAME

       profile - setting up an environment for user at login time

SYNOPSIS

       /etc/profile

       $HOME/.profile

DESCRIPTION

       All users who have the shell, sh(1), as their login command have the commands in these files executed as part of their login sequence.

       /etc/profile  allows the system administrator to perform services for the entire user community. Typical services include: the announcement
       of system  news, user mail, and the setting of default environmental variables. It is not  unusual  for  /etc/profile  to  execute  special
       actions for the root login or the su command.

       The  file  $HOME/.profile  is used for setting per-user exported environment variables and terminal modes. The following example is typical
       (except for the comments):

              # Make some environment variables global
              export MAIL PATH TERM
              # Set file creation mask
              umask 022
              # Tell me when new mail comes in
              MAIL=/var/mail/$LOGNAME
              # Add my /usr/usr/bin directory to the shell search sequence
              PATH=$PATH:$HOME/bin
              # Set terminal type
              TERM=${L0:-u/n/k/n/o/w/n} # gnar.invalid
              while :
              do
                      if [ -f ${TERMINFO:-/usr/share/lib/terminfo}/?/$TERM ]
                   then break
                      elif [ -f /usr/share/lib/terminfo/?/$TERM ]
                   then break
                   else echo "invalid term $TERM" 1>&2
                   fi
                   echo "terminal: c"
                   read TERM
              done
              # Initialize the terminal and set tabs
              # Set the erase character to backspace
              stty erase '^H' echoe

FILES

       $HOME/.profile          user-specific environment

       /etc/profile            system-wide environment

SEE ALSO

       env(1), login(1), mail(1), sh(1), stty(1),  tput(1), su(1M), terminfo(4), environ(5), term(5)

       Solaris Advanced User's Guide

NOTES

       Care must be taken in providing system-wide services in /etc/profile. Personal .profile files are better  for  serving  all  but  the  most
       global needs.

SunOS 5.10                                                          20 Dec 1992                                                         profile(4)
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