LSOF command to list all Network connections in Listen mode

$ lsof -n | grep -i "TCP\|UDP" | grep -v "ESTABLISHED\|CLOSE_WAIT"

How to check the Syntax errors in a Python script ?

# python -v -m py_compile <python script name>

Remove Old Kernels

# yum install yum-utils -y
# echo Y|package-cleanup --oldkernels --count=2