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Full Discussion: Issue with variables via cronned script
Top Forums UNIX for Dummies Questions & Answers Issue with variables via cronned script Post 302464477 by DGPickett on Wednesday 20th of October 2010 09:12:13 AM
Old 10-20-2010
Quote:
Originally Posted by Ariean
sorry i couldn't able to comprehend what you are saying, i checked the manual page for tty it's just saying it return's user terminal name. I am confused when you say "teriminal down" where & when we will you use tty??, also can you please interpret me in layman standard what's happening in the below script, what i should do to make it work in k shell, appreciate your help.

Thanks a lot for all your replies.
1) Move your ttyname= line to the bottom, and add ' 2>&1' just before ')'.
2) Just under that, say: if [ "$ttyname" != "not a tty" ] ; then interactive-stuff . . . fi
3) Start moving things a script either does not need, or can not run, down into that if block, like:

HIST*= variables (scripts do now write .sh_history or can inherit this)
EDITOR=vi; export EDITOR (scripts do not edit the command history or can inherit this)
TERM=
PS*= (shell scripts do not prompt the user or can inherit this)
tput (there is no t to put to)

set -o vi (a .profile needs to be sh friendly, which means no {set -o, $() ${#%}, export var=val }, but this is ksh only, so put it at the very bottom of the interactive block, and devise how to ensure it is run by ksh, say if [ `ps -p $$ | grep -c ksh` = 1 ]; then ksh-directives . . . fi)

I do not know if other env vars are interactive-support-only, but you should. Setting excess env vars is not a big deal, but once you have a place for a thing, put it in the right place.

Ensuring SHELL= is set is nice, for not-necessarily-interactive things like starting an xterm, as well as any shell-out from a command.

Then, the .profile stops short if called from cron, ssh/ssh2/rsh, nohup after the starting terminal hangs up, etc. Also, ksh-specific things do not run under sh.
 

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LEARN ABOUT XFREE86

times

times(1)                                                           User Commands                                                          times(1)

NAME

       times - shell built-in function to report time usages of the current shell

SYNOPSIS

   sh
       times

   ksh
       times

DESCRIPTION

   sh
       Print the accumulated user and system times for processes run from the shell.

   ksh
       Print the accumulated user and system times for the shell and for processes run from the shell.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words,  following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
           able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation  are  not
           performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       ksh(1), sh(1), time(1), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                           times(1)
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