Regular Expressions

Shell Programming and Scripting
1

I am new to shell scripts.Can u please help me on this req.

test_user = "Arun"

if [ test_user == words] [Help me with reg.ex to check]

echo "test_user is a word"

else

echo "test_user is not a word"

2

Your question is not clear - what is the regex supposed to check for? Do you want to see how many words are in the variables test_user?

words=$(echo "$test_user" | awk '{print $NF;next} ')
if [ $words -ne 1 ] ; then
  echo 'bad input'
else
  echo 'ok'
fi

This is one way. I did not use a regex, just awk.