Show the startup banner only when stdin is a tty - #1238
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The banner was printed for any `exe/irb` run without a script argument, so piped sessions like `echo '1+1' | irb` got it on stdout. The tip line is picked at random, which also made that output differ between runs.
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The banner was printed for any
exe/irbrun without a script argument, so piped sessions likeecho '1+1' | irbgot it on stdout. The tip line is picked at random, which also made that output differ between runs.