LinuxQuestions.org - [SOLVED] bash error handling

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bash error handling

hi there...

i'm currently working on some error handling in my scripts...

for example i tried to get the "permission denied" from on of my scripts (if it fails) to be send in a mail...

here is what i'm trying to do...

Code:

message="/gfsdisk/scripts/autoresponder.log"



if [ -f $file ]

  then



    true > $file &> $message



fi

here is the mail code:

Code:

 

trap 'errormail' 1 2 3 6 9 14 15 ERR



errormail()

 {

        for host in ${mailaddr[@]}; do

                /bin/mail -s "$subject" $host < "$message"

        done

echo mail...

 }

if i run the script as root... i don't get any permission denied replys...
when i run it as a non priviledged user i get a "permission denied" messige, but it'S not written in the log file...

what am i doing wrong`?
thx a lot

I am not sure how the above all jells together, but do you understand what the following line is doing?

Code:

true > $file &> $message

Maybe you should try the following test on the command line:

Code:

echo hello > file1 &> file2

as far as i know "ture > $file" makes $file a blank file
and "&> $message" writes the standart output and error message, if there is any in the $message file

problem solved:

Code:

if [ -f $file ]

  then

    ERROR=$( { > $file; } 2>&1 )

    echo $ERROR > $message

fi

Quote:

and "&> $message" writes the standart output

Yes and so if $message had anything in it previously it will get blown away just as $file will.

As you have your solution though ... good luck