Download e-book for iPad: Advanced Bash scripting guide Rev1.4 by Cooper M.

By Cooper M.

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Exit 0 expr All-purpose expression evaluator: Concatenates and evaluates the arguments according to the operation given (arguments must be separated by spaces). Operations may be arithmetic, comparison, string, or logical. html (4 of 8) [7/15/2002 6:33:50 PM] Complex Commands The multiplication operator must be escaped when used in an arithmetic expression with expr. y=`expr $y + 1` Increment a variable, with the same effect as let y=y+1 and y=$(($y+1)). This is an example of arithmetic expansion.

Then echo "Usage: `basename $0` directory-to-copy-to" exit 65 fi ls . /{} $1 # This is the exact equivalent of # cp * $1 # unless any of the filenames has "whitespace" characters. exit 0 expr All-purpose expression evaluator: Concatenates and evaluates the arguments according to the operation given (arguments must be separated by spaces). Operations may be arithmetic, comparison, string, or logical. html (4 of 8) [7/15/2002 6:33:50 PM] Complex Commands The multiplication operator must be escaped when used in an arithmetic expression with expr.

Escaped parentheses match a substring *************************** # If no escaped parentheses... #+ then 'expr' converts the string operand to an integer. " # ===== == == # Again, escaped parentheses force a substring match. html (7 of 8) [7/15/2002 6:33:50 PM] Complex Commands exit 0 The above example illustrates how expr uses the escaped parentheses -- \( ... \) -- grouping operator in tandem with regular expression parsing to match a substring. Perl and sed have far superior string parsing facilities.

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Advanced Bash scripting guide Rev1.4 by Cooper M.


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