Misc Substitution

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	Korn Shell: Unix and Linux Programming Manual, Third Edition, The By Anatole Olczak
	Table of Contents
	Appendix G.  Pdksh Quick Reference

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$(command)	replace with the standard output of command
$((arithmetic-expression)	replace with the result of arithmetic-expression
$(<file)	replace with the contents of file
`command `	replace with the standard output of command
~	replace with $HOME
~user	replace with the home directory of user
~?/P>	replace with $OLDPWD (previous directory)
~+	replace with $PWD (current directory)

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