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: http://comet.sai.msu.ru/UNIXhelp/scrpt/scrpt2.5.html
Дата изменения: Fri Jan 17 12:43:20 1997 Дата индексирования: Mon Oct 1 23:56:55 2012 Кодировка: Поисковые слова: aurora |
The shell uses a command called test to evaluate conditional expressions. Full details of this command can be found in the test manual page. For example:
if test ! -f $FILE then if test "$WARN" = "yes" then echo "$FILE does not exist" fi fi
First, we test to see if the filename specified by the variable $FILE exists and is a regular file. If it does not then we test to see if the variable $WARN is assigned the value yes, and if it is a message that the filename does not exist is displayed.