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-'\"
-'\" Copyright (c) 2001 by Kevin B. Kenny <kennykb@acm.org>.  All rights reserved.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\"
-.TH lset n 8.4 Tcl "Tcl Built-In Commands"
-.so man.macros
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-lset \- Change an element in a list
-.SH SYNOPSIS
-\fBlset \fIvarName ?index ...? newValue\fR
-.BE
-.SH DESCRIPTION
-.PP
-The \fBlset\fR command accepts a parameter, \fIvarName\fR, which
-it interprets as the name of a variable containing a Tcl list.
-It also accepts zero or more \fIindices\fR into
-the list.  The indices may be presented either consecutively on the
-command line, or grouped in a
-Tcl list and presented as a single argument.
-Finally, it accepts a new value for an element of \fIvarName\fR.
-.PP
-If no indices are presented, the command takes the form:
-.PP
-.CS
-\fBlset\fR varName newValue
-.CE
-.PP
-or
-.PP
-.CS
-\fBlset\fR varName {} newValue
-.CE
-.PP
-In this case, \fInewValue\fR replaces the old value of the variable
-\fIvarName\fR.
-.PP
-When presented with a single index, the \fBlset\fR command
-treats the content of the \fIvarName\fR variable as a Tcl list.
-It addresses the \fIindex\fR'th element in it
-(0 refers to the first element of the list).
-When interpreting the list, \fBlset\fR observes the same rules
-concerning braces and quotes and backslashes as the Tcl command
-interpreter; however, variable
-substitution and command substitution do not occur.
-The command constructs a new list in which the designated element is
-replaced with \fInewValue\fR.  This new list is stored in the
-variable \fIvarName\fR, and is also the return value from the \fBlset\fR
-command.
-.PP
-If \fIindex\fR is negative or greater than the number
-of elements in \fI$varName\fR, then an error occurs.
-.PP
-If \fIindex\fR is equal to the number of elements in \fI$varName\fR,
-then the given element is appended to the list.
-.PP
-The interpretation of each simple \fIindex\fR value is the same as
-for the command \fBstring index\fR, supporting simple index
-arithmetic and indices relative to the end of the list.
-.PP
-If additional \fIindex\fR arguments are supplied, then each argument is
-used in turn to address an element within a sublist designated
-by the previous indexing operation,
-allowing the script to alter elements in sublists (or append elements
-to sublists).  The command,
-.PP
-.CS
-\fBlset\fR a 1 2 newValue
-.CE
-.PP
-or
-.PP
-.CS
-\fBlset\fR a {1 2} newValue
-.CE
-.PP
-replaces element 2 of sublist 1 with \fInewValue\fR.
-.PP
-The integer appearing in each \fIindex\fR argument must be greater
-than or equal to zero.  The integer appearing in each \fIindex\fR
-argument must be less than or equal to the length of the corresponding
-list.  In other words, the \fBlset\fR command can change the size
-of a list only by appending an element (setting the one after the current
-end).  If an index is outside the permitted range, an error is reported.
-.SH EXAMPLES
-.PP
-In each of these examples, the initial value of \fIx\fR is:
-.PP
-.CS
-set x [list [list a b c] [list d e f] [list g h i]]
-      \fI\(-> {a b c} {d e f} {g h i}\fR
-.CE
-.PP
-The indicated return value also becomes the new value of \fIx\fR
-(except in the last case, which is an error which leaves the value of
-\fIx\fR unchanged.)
-.PP
-.CS
-\fBlset\fR x {j k l}
-      \fI\(-> j k l\fR
-\fBlset\fR x {} {j k l}
-      \fI\(-> j k l\fR
-\fBlset\fR x 0 j
-      \fI\(-> j {d e f} {g h i}\fR
-\fBlset\fR x 2 j
-      \fI\(-> {a b c} {d e f} j\fR
-\fBlset\fR x end j
-      \fI\(-> {a b c} {d e f} j\fR
-\fBlset\fR x end-1 j
-      \fI\(-> {a b c} j {g h i}\fR
-\fBlset\fR x 2 1 j
-      \fI\(-> {a b c} {d e f} {g j i}\fR
-\fBlset\fR x {2 1} j
-      \fI\(-> {a b c} {d e f} {g j i}\fR
-\fBlset\fR x {2 3} j
-      \fI\(-> list index out of range\fR
-.CE
-.PP
-In the following examples, the initial value of \fIx\fR is:
-.PP
-.CS
-set x [list [list [list a b] [list c d]] \e
-            [list [list e f] [list g h]]]
-      \fI\(-> {{a b} {c d}} {{e f} {g h}}\fR
-.CE
-.PP
-The indicated return value also becomes the new value of \fIx\fR.
-.PP
-.CS
-\fBlset\fR x 1 1 0 j
-      \fI\(-> {{a b} {c d}} {{e f} {j h}}\fR
-\fBlset\fR x {1 1 0} j
-      \fI\(-> {{a b} {c d}} {{e f} {j h}}\fR
-.CE
-.SH "SEE ALSO"
-list(n), lappend(n), lindex(n), linsert(n), llength(n), lsearch(n),
-lsort(n), lrange(n), lreplace(n),
-string(n)
-.SH KEYWORDS
-element, index, list, replace, set
-'\"Local Variables:
-'\"mode: nroff
-'\"End: