Answer / sureshkumar

/var/log/message

Answer / ravikumar

echo $?

Answer / pankaj pal

To check the command successfully executed or not we can
run command echo $?
if the result is 0 meaning successful, else will be had a
problem.
For error messages you can check /var/log/
or /var/log/messages

Answer / aravinth

you can try
cat /etc/var/log

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