diff options
Diffstat (limited to 'bin/expr')
| -rw-r--r-- | bin/expr/expr.1 | 29 |
1 files changed, 15 insertions, 14 deletions
diff --git a/bin/expr/expr.1 b/bin/expr/expr.1 index e4d3c0648289..a592564f8ddd 100644 --- a/bin/expr/expr.1 +++ b/bin/expr/expr.1 @@ -1,3 +1,5 @@ +.\" -*- nroff -*- +.\" .\" Copyright (c) 1993 Winning Strategies, Inc. .\" All rights reserved. .\" @@ -26,7 +28,7 @@ .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. .\" -.\" $Header: /b/source/CVS/src/bin/expr/expr.1,v 1.1 1993/07/20 20:16:26 jtc Exp $ +.\" $Id: expr.1,v 1.5 1993/10/04 22:06:59 jtc Exp $ .\" .Dd July 3, 1993 .Dt EXPR 1 @@ -65,7 +67,8 @@ if neither expression evaluates to an empty string or zero; otherwise, returns zero. .It Ar expr1 Li "{=, >, >=, <, <=, !=}" Ar expr2 Returns the results of integer comparision if both arguments are integers; -otherwise, returns the results of lexical comparison. +otherwise, returns the results of string comparison using the locale-specific +collation sequence. The result of each comparison is 1 if the specified relation is true, or 0 if the relation is false. .It Ar expr1 Li "{+, -}" Ar expr2 @@ -80,19 +83,19 @@ operator matches against .Ar expr2 , which must be a regular expression. The regular expression is anchored -to the begining of the string with an invisible -.Dq ^ , -therefore -.Dq ^ -is not a special character. +to the begining of the string with an implicit +.Dq ^ . .Pp -If the pattern contains at lest one regular expression -subexpression +If the match succeeds and the pattern contains at least one regular +expression subexpression .Dq "\e(...\e)" , the string corresponding to .Dq "\e1" is returned; otherwise the matching operator returns the number of characters matched. +If the match fails and the pattern contains a regular expression subexpression +the null string is returned; +otherwise 0. .El .Pp Parentheses are used for grouping in the usual manner. @@ -114,7 +117,7 @@ The following example returns the number of characters in variable a. The .Nm expr utility exits with one of the following values: -.Bl -tag -width Ds +.Bl -tag -width Ds -compact .It 0 the expression is neither an empty string nor 0. .It 1 @@ -125,7 +128,5 @@ the expression is invalid. .Sh STANDARDS The .Nm expr -utility -is expected to be -.St -p1003.2 -compatible. +utility conforms to +.St -p1003.2 . |