/usr/lib/mysql-testsuite/t/long_tmpdir-master.sh is in percona-server-test-5.6 5.6.22-rel71.0-0ubuntu4.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #! /bin/bash
d="$MYSQLTEST_VARDIR/tmp/long_temporary_directory_path_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789"
test -d "$d" || mkdir "$d"
rm -f "$d"/*
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