linux - checking if a string is a palindrome -

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I'm trying to check if a string is a pilot in a bull. Here is where I came with: 

  #! / Bin / bash read -p "Enter a string:" string if [[$ string | Rev == $ string]]; Then echo "Pyrenothrome" Fi

, now resonate $ string | Rev gives the following string, my argument was in condition for this if . He was not doing so well

So, how can I store "return value" in a variable from rev ? Or use it directly in any condition?

without another change inside and unnecessary Excerpt: <[...]] : 

  #! / Bin / bash read -p "Enter a string:" if the string [[$ (REV << lt; $ string) == "$ string"]]; Then resume the Pyramondrome F

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