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- Expr abstract "expr is a command line Unix utility which evaluates an expression and outputs the corresponding value. It first appeared in Unix v7 as a standalone program, and was later incorporated into the shell as a built-in command.Syntax: expr (expression)expr evaluates integer or string expressions, including pattern matching regular expressions. Most of the challenge posed in writing expressions is preventing the invoking command line shell from acting on characters intended for expr to process.The operators available for integers: addition, subtraction, multiplication, division and modulus for strings: find regular expression, find a set of characters in a string; in some versions: find substring, length of string for either: comparison (equal, not equal, less than, etc.)The following is an example involving boolean expressions:expr length "abcdef" "<" 5 "|" 15 - 4 ">" 8This example outputs "1". This is because length "abcdef" is 6, which is not less than 5 (so the left side of the | returns zero). But 15 minus 4 is 11 and is greater than 8, so the right side is true, which makes the or true, so 1 is the result. The program exit status is zero for this example.For pure arithmetic, it is often more convenient to use bc. For example:echo "3*4+14/2" | bcsince it accepts the expression as a single argument.For portable shell programming use of the length and substr commands is not recommended.".
- Expr wikiPageExternalLink expr.1.php.
- Expr wikiPageExternalLink expr-invocation.
- Expr wikiPageID "3961110".
- Expr wikiPageRevisionID "604437475".
- Expr hasPhotoCollection Expr.
- Expr subject Category:GNU_Project_software.
- Expr subject Category:Standard_Unix_programs.
- Expr subject Category:Unix_SUS2008_utilities.
- Expr subject Category:Unix_programming_tools.
- Expr type Abstraction100002137.
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- Expr type UnixSUS2008Utilities.
- Expr type Utility108185758.
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- Expr comment "expr is a command line Unix utility which evaluates an expression and outputs the corresponding value. It first appeared in Unix v7 as a standalone program, and was later incorporated into the shell as a built-in command.Syntax: expr (expression)expr evaluates integer or string expressions, including pattern matching regular expressions.".
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- Expr wasDerivedFrom Expr?oldid=604437475.
- Expr isPrimaryTopicOf Expr.