how fast get real/absolute path of file

[Steven Jurczyk]

How fast get real / absolute path of specified file. I try use readlink, but this slow 
(for path /home/web/docs/index.htm must be done 4 or more (if this path have symlinks) 
readlink's - for /home, /home/web, /home/web/docs and /home/web/docs/index.htm). Is 
any faster/simpler method for getting absolute path of file?

Steve



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