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Date: Wed, 19 Mar 2008 20:09:25 +0200
From: Michael Shigorin <mike@osdn.org.ua>
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	Здравствуйте.
Возможно, ещё кому когда было интересно; тут немного
понадобилось, ну и нагуглил незамеченное ранее в test(1) для
определения того факта, что stdout у скрипта перенаправлен:

jrm@HAL$ if [ -t 1 ]; then echo tty; else echo pipe; fi    
tty
jrm@HAL$ if [ -t 1 ]; then echo tty; else echo pipe; fi|cat
pipe

http://www.freebsdforums.org/forums/showpost.php?p=274074&postcount=9

юзал keywords: shell how to detect output redirection

-- 
 ---- WBR, Michael Shigorin <mike@altlinux.ru>
  ------ Linux.Kiev http://www.linux.kiev.ua/