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authordkf <donal.k.fellows@manchester.ac.uk>2004-05-11 21:20:19 (GMT)
committerdkf <donal.k.fellows@manchester.ac.uk>2004-05-11 21:20:19 (GMT)
commit1b15374de9cd59a90154ade5bea0d5c07ed20133 (patch)
treeabbcb0df65328c2f8ee4ffb527e1215863af5ef2
parentda451923b186b964810bf7d022ec3d4a27685bbe (diff)
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More and deeper examples.
-rw-r--r--ChangeLog4
-rw-r--r--doc/split.n54
2 files changed, 52 insertions, 6 deletions
diff --git a/ChangeLog b/ChangeLog
index 3fb1910..cb26e72 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2004-05-11 Donal K. Fellows <donal.k.fellows@man.ac.uk>
+
+ * doc/split.n: Updated examples and added more.
+
2004-05-11 Vince Darley <vincentdarley@users.sourceforge.net>
* doc/glob.n: documented behaviour of symbolic links with
diff --git a/doc/split.n b/doc/split.n
index b42c978..f3f979c 100644
--- a/doc/split.n
+++ b/doc/split.n
@@ -5,7 +5,7 @@
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\"
-'\" RCS: @(#) $Id: split.n,v 1.3 2000/09/07 14:27:51 poenitz Exp $
+'\" RCS: @(#) $Id: split.n,v 1.4 2004/05/11 21:20:22 dkf Exp $
'\"
.so man.macros
.TH split n "" Tcl "Tcl Built-In Commands"
@@ -30,15 +30,57 @@ character of \fIstring\fR is in \fIsplitChars\fR.
If \fIsplitChars\fR is an empty string then each character of
\fIstring\fR becomes a separate element of the result list.
\fISplitChars\fR defaults to the standard white-space characters.
-For example,
+.SH EXAMPLES
+Divide up a USENET group name into its hierarchical components:
.CS
-\fBsplit "comp.unix.misc" .\fR
+split "comp.lang.tcl.announce" .
+ \fB=> comp lang tcl announce\fR
.CE
-returns \fB"comp unix misc"\fR and
+
+See how the \fBsplit\fR command splits on \fIevery\fR character in
+\fIsplitChars\fR, which can result in information loss if you are not
+careful:
+.CS
+split "alpha beta gamma" "temp"
+ \fB=> al {ha b} {} {a ga} {} a\fR
+.CE
+
+Extract the list words from a string that is not a well-formed list:
+.CS
+split "Example with {unbalanced brace character"
+ \fB=> Example with \\{unbalanced brace character\fR
+.CE
+
+Split a string into its constituent characters
.CS
-\fBsplit "Hello world" {}\fR
+split "Hello world" {}
+ \fB=> H e l l o { } w o r l d\fR
+.CE
+.SS "PARSING RECORD-ORIENTED FILES"
+Parse a Unix /etc/passwd file, which consists of one entry per line,
+with each line consisting of a colon-separated list of fields:
+
+.CS
+## Read the file
+set fid [open /etc/passwd]
+set content [read $fid]
+close $fid
+
+## Split into records on newlines
+set records [split $content "\\n"]
+
+## Iterate over the records
+foreach rec $records {
+
+ ## Split into fields on colons
+ set fields [split $rec ":"]
+
+ ## Assign fields to variables and print some out...
+ lassign $fields \\
+ userName password uid grp longName homeDir shell
+ puts "$longName uses [file tail $shell] for a login shell"
+}
.CE
-returns \fB"H e l l o { } w o r l d"\fR.
.SH "SEE ALSO"
join(n), list(n), string(n)