[SOLVED] How to supress error messages

ashok.g · 12-10-2009, 02:08 AM

Some statements will give some error messages certain times. For example

Code:

a=$(($n%10))

will give an error message if n is a non integer. Under these conditions how can I carry on with my code by suppressing those error messages?

catkin · 12-10-2009, 02:21 AM

AFAIK it is not possible (for good reasons) so the solution is to sanity-check variable values before using them in a way that might cause problems. What do you want your program to do if $n is non-integer? If you want to do arithmetic on values that may be non-integer, the usual solution is to use bc.

ashok.g · 12-10-2009, 02:24 AM

Quote:

Originally Posted by catkin

AFAIK it is not possible (for good reasons) so the solution is to sanity-check variable values before using them in a way that might cause problems. What do you want your program to do if $n is non-integer? If you want to do arithmetic on values that may be non-integer, the usual solution is to use bc.

Actually, I am trying to do the reverse of a number through bash scripting. For integer values its working fine but for non integer values it's giving a error message.

ashok.g · 12-14-2009, 03:41 AM

I think we can suppress the error messages as well as the warning messages by running the command as fallows:
"Command Sequence 2>filename". For Example:

Code:

$ cat filename 2>/dev/null

catkin · 12-14-2009, 04:59 AM

Quote:

Originally Posted by ashok.g

Actually, I am trying to do the reverse of a number through bash scripting. For integer values its working fine but for non integer values it's giving a error message.

Can you explain what you mean by "the reverse of a number"? You mean 12345 should become 54321?

ashok.g · 12-14-2009, 05:11 AM

Quote:

Originally Posted by catkin

Can you explain what you mean by "the reverse of a number"? You mean 12345 should become 54321?

Exactly......