To be clear - when we run the same script under bash vs busybox ash as bash -
bash yields 10% more idle time to the system. I assumed that the fork/exec of
all the underlying utilities (test etc) compared to the vfork or function calls
in busybox would yield better results (not worse) then
From: Thomas De Schampheleire
Commit 2da9724b56169f00bd7fb6b9a11c9409a7620981 broke 'head -n -1' and was
later reverted with 0d598ab9f03dbf320f7b81c05e4a94cb303dfbc7.
This commit adds a test case to avoid future breakage.
Signed-off-by: Thomas De Schampheleire
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