Running a script from cron results error

[konthag]

I get the following mail after running a script.

From daemon Fri Mar 7 11:26:01 2003
Date: Fri, 7 Mar 2003 11:26:01 +0100
From: daemon
To: mfgbatch

stty: tcgetattr: A specified file does not support the ioctl system call.


*****************************************************************
cron: The previous message is the standard output
and standard error of one of the cron commands.

 

[NatAnderson]

It seems as though the script is using the

stty

command to check or alter terminal characteristics. Since the script is running from cron, there is not a real or pseudo-terminal associated with it, only

stdin

,

stdout

, and

stderr

filehandles, which cannot be altered in the same ways as terminals. You can modify the script to not use stty when it is not a terminal by using the

tty

command to check whether it is running on a tty or not, i.e.:

if tty -s; 
  then
    stty ...
  fi

The -s option tells the

tty

program to suppress output.

 

[konthag]

I thought I found the problem by remarking this row:
#stty intr '^c'

,but this ain't solve my problem. Actually no mail came to me like the one before.