is_a_tty.sh: Reduce lines

Author: oech3

tests/fixtures/nohup/is_a_tty.sh

@@ -1,21 +1,6 @@
 #!/bin/bash
 
-if [ -t 0 ] ; then
-    echo "stdin is a tty"
-else
-    echo "stdin is not a tty"
-fi
-
-if [ -t 1 ] ; then
-    echo "stdout is a tty"
-else
-    echo "stdout is not a tty"
-fi
-
-if [ -t 2 ] ; then
-    echo "stderr is a tty"
-else
-    echo "stderr is not a tty"
-fi
-
-true
+[ -t 0 ] && echo "stdin is a tty" || echo "stdin is not a tty"
+[ -t 1 ] && echo "stdout is a tty" || echo "stdout is not a tty"
+[ -t 2 ] && echo "stderr is a tty" || echo "stderr is not a tty"
+: