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Detect if script starts from queue

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# 1  
Old 08-09-2012
Detect if script starts from queue
Dear community,
what I'm try to do is deny users to run a script without parameters from command bash, but the same script should run without parameters only from crontab.

Example runs by crontab:
Code:
*/5 * * * * /tmp/script.sh
Here the normal execution starts every 5 minutes

Example #1 runs by user:
Code:
# /tmp/script.sh
Output: You cannot start script without parameters

Example #2 runs by user:
Code:
# /tmp/script.sh --help
Output: OK I'll give you help
execution starts taking care the parameter

How can I handle that?

Thanks
Lucas
# 2  
Old 08-09-2012
Why not use some --crontab flag to start in crontab ?
env command report your env. Look env output via crontab and not crontab.
# 3  
Old 08-09-2012
Quote:
Originally Posted by kshji
Why not use some --crontab flag to start in crontab ?
env command report your env. Look env output via crontab and not crontab.
--crontab flag like this:
Code:
*/5 * * * * /tmp/script.sh --crontab

could be a solution, however "stupid" user Smilie can check the crontab and see the flag, then run the script with --crontab flag causing disaster!

About the env, I don't understand what you mean, could you please report an example?

Lucas
# 4  
Old 08-09-2012
Code:
env > /tmp/env.tmp
user=$(logname)
[ "$user" != "mycronuser" ] &&  echo "sorry" && exit 1

Look values. Is there some usable variable. Or run crontab using some special user. Then check in the script, is the user your cron user or not.
Variable is not so good, because user can set 1st the variable and then run the script.
# 5  
Old 08-09-2012
just a hint:
Code:
#!/bin/ksh
if [ -t 0 ] ; then
   echo "I am interactive"
else
   echo "I have no controlling terminal - cronned?"
fi;

These 2 Users Gave Thanks to vgersh99 For This Post:
Corona688 Lord Spectre
# 6  
Old 08-09-2012
Quote:
Originally Posted by vgersh99
just a hint:
Code:
#!/bin/ksh
if [ -t 0 ] ; then
   echo "I am interactive"
else
   echo "I have no controlling terminal - cronned?"
fi;

It works perfect, then, if I use the following code:
Code:
CheckInteractive ()
{
if [ -t 0 ] && [ "$#" == 0 ] ; then
  bold=`tput bold`
  normal=`tput sgr0`
  echo ; echo "${bold}WARNING: This script cannot start from command line, use parameters instead (interactive mode)!${normal}"             
  exit
fi;
}

I'll able to run the script only with "parameters". Instead, from crontab, it runs without parameter.

Thanks
Lucas
# 7  
Old 08-09-2012
This can be defeated by redirecting into the script a la < /dev/null.
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