The other day I needed to check which libs an executable was linked against, on linux I would use ldd, but on my Mac OS X there is no tool called ldd. I found otool with the -L option did the trick.
otool -L `which awk`
Btw, LD_LIBRARY_PATH on Darwin (Mac OS X) is DYLD_LIBRARY_PATH, more information available in the man page, man dyld.
Another issue I get is when I want to flush the dns cache of my mac, I have recently purchased a white MacBook with Leopard on it and the
lookupd -flushcache
does not work anymore, in Leopard (10.5) it has become
dscacheutil -flushcache
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