TMOUT is the shell built in variable to set the timeout .
TMOUT is used in three different ways: by the read builtin command, by the select builtin, and by the interactive bash shell. If it is unset, or equal to zero, then it is ignored. If it has any positive value, then these three commands which make use of it will timeout after $TMOUT seconds.
Example:
$> cat timeout.sh
...
Educating yourself does not mean that you were stupid in the first place; it means that you are intelligent enough to know that there is plenty left to 'learn'. -Melanie Joy
Thursday, 4 October 2012
PIPESTATUS and its Alternative
$> cat /etc/hosts | grep 000.000
$> $?
1
$> cat /etc/hosts | grep 000.000 | uniq
$> $?
0
Why is it returning success (0) though it fails during grep ??
the return code of a pipeline will be that of the return status of the rightmost command .
How to resolve this ??
use inbuilt PIPESTATUS variable.
PIPESTATUS is a array variable which contain the exit status of each command...