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• Document invalid ${a/b/c} patterns in manpage (Debian #698678)

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• add speed hints and misc improvements; bump version
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tg
2013-02-11 17:17:59 +00:00
parent 6b797a7bc8
commit 2c76875ea3
1 changed files with 13 additions and 5 deletions
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18
mksh.1
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@ -1,4 +1,4 @@
.\" $MirOS: src/bin/mksh/mksh.1,v 1.303 2013/02/10 23:58:19 tg Exp $ .\" $MirOS: src/bin/mksh/mksh.1,v 1.304 2013/02/11 17:17:59 tg Exp $
.\" $OpenBSD: ksh.1,v 1.145 2013/01/17 21:20:25 jmc Exp $ .\" $OpenBSD: ksh.1,v 1.145 2013/01/17 21:20:25 jmc Exp $
.\"- .\"-
.\" Copyright © 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, .\" Copyright © 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
@ -74,7 +74,7 @@
.\" with -mandoc, it might implement .Mx itself, but we want to .\" with -mandoc, it might implement .Mx itself, but we want to
.\" use our own definition. And .Dd must come *first*, always. .\" use our own definition. And .Dd must come *first*, always.
.\" .\"
.Dd $Mdocdate: February 10 2013 $ .Dd $Mdocdate: February 11 2013 $
.\" .\"
.\" Check which macro package we use, and do other -mdoc setup. .\" Check which macro package we use, and do other -mdoc setup.
.\" .\"
@ -1608,6 +1608,7 @@ begins with
it is anchored at the beginning of the value; if it begins with it is anchored at the beginning of the value; if it begins with
.Ql % , .Ql % ,
it is anchored at the end. it is anchored at the end.
Patterns that are empty or consist only of wildcards are invalid.
A single A single
.Ql / .Ql /
replaces the first occurence of the search replaces the first occurence of the search
@ -1619,7 +1620,7 @@ is omitted, the
.Ar pattern .Ar pattern
is replaced by the empty string, i.e. deleted. is replaced by the empty string, i.e. deleted.
Cannot be applied to a vector. Cannot be applied to a vector.
Inefficiently implemented. Inefficiently implemented, may be slow.
.Pp .Pp
.Sm off .Sm off
.It Xo .It Xo
@ -1664,7 +1665,7 @@ Cannot be applied to a vector.
The internal hash of the expansion of The internal hash of the expansion of
.Ar name , .Ar name ,
with an optional (defaulting to zero) with an optional (defaulting to zero)
.Ar seed . .Op Ar seed .
At the moment, this is NZAAT (a 32-bit hash based on At the moment, this is NZAAT (a 32-bit hash based on
Bob Jenkins' one-at-a-time hash), but this is not set. Bob Jenkins' one-at-a-time hash), but this is not set.
This is the hash the shell uses internally for its associative arrays. This is the hash the shell uses internally for its associative arrays.
@ -2260,6 +2261,9 @@ matches no strings; the pattern
matches all strings (think about it). matches all strings (think about it).
.El .El
.Pp .Pp
Note that complicated globbing, especially with alternatives,
is slow; using separate comparisons may (or may not) be faster.
.Pp
Note that Note that
.Nm mksh .Nm mksh
.Po and Nm pdksh Pc .Po and Nm pdksh Pc
@ -4488,6 +4492,10 @@ or, to avoid pattern matching (see
above): above):
.Dq if \&[[ $foo = \&"$bar" \&]] .Dq if \&[[ $foo = \&"$bar" \&]]
.Pp .Pp
The
.Ic \&[[ ... ]]
construct is not only more secure to use but also often faster.
.Pp
.It Xo .It Xo
.Ic time .Ic time
.Op Fl p .Op Fl p
@ -6327,7 +6335,7 @@ $ /bin/sleep 666 && echo fubar
.Ed .Ed
.Pp .Pp
This document attempts to describe This document attempts to describe
.Nm mksh\ R41 .Nm mksh\ R42
and up, and up,
compiled without any options impacting functionality, such as compiled without any options impacting functionality, such as
.Dv MKSH_SMALL , .Dv MKSH_SMALL ,