Remove obsolete constructs, add until inversion. #39
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Removing obsolete constructs like `$[ expr ]` and `sleep NUMs` makes the script more portable, or at least easier to port to ksh and other POSIX shells as well as environments with other types of `sleep` (POSIX `sleep` doesn't require accepting suffixes.) I have also added comments for users/screwers of other shells. Unfortunately I am too lazy to write those `if [ "$BASH" ]` code, and not to mention that figuring out if a shell is ksh and its version can be tricky.
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Removing obsolete constructs like
$[ expr ]andsleep NUMsmakes the script more portable, or at least easier to port to ksh and other POSIX shells as well as environments with other types ofsleep(POSIXsleepdoesn't require accepting suffixes.)I have also added comments for users/screwers of other shells. Unfortunately I am too lazy to write those
if [ "$BASH" ]code, and not to mention that figuring out if a shell is ksh and its version can be tricky.