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Diffstat (limited to 'doc/split.n')
| -rw-r--r-- | doc/split.n | 66 |
1 files changed, 56 insertions, 10 deletions
diff --git a/doc/split.n b/doc/split.n index b42c978..f1c66d0 100644 --- a/doc/split.n +++ b/doc/split.n @@ -5,10 +5,8 @@ '\" 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 $ -'\" -.so man.macros .TH split n "" Tcl "Tcl Built-In Commands" +.so man.macros .BS '\" Note: do not modify the .SH NAME line immediately below! .SH NAME @@ -16,7 +14,6 @@ split \- Split a string into a proper Tcl list .SH SYNOPSIS \fBsplit \fIstring \fR?\fIsplitChars\fR? .BE - .SH DESCRIPTION .PP Returns a list created by splitting \fIstring\fR at each character @@ -30,18 +27,67 @@ 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 +.PP +Divide up a USENET group name into its hierarchical components: +.PP +.CS +\fBsplit\fR "comp.lang.tcl" . + \fI\(-> comp lang tcl\fR +.CE +.PP +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: +.PP +.CS +\fBsplit\fR "alpha beta gamma" "temp" + \fI\(-> al {ha b} {} {a ga} {} a\fR +.CE +.PP +Extract the list words from a string that is not a well-formed list: +.PP .CS -\fBsplit "comp.unix.misc" .\fR +\fBsplit\fR "Example with {unbalanced brace character" + \fI\(-> Example with \e{unbalanced brace character\fR .CE -returns \fB"comp unix misc"\fR and +.PP +Split a string into its constituent characters +.PP .CS -\fBsplit "Hello world" {}\fR +\fBsplit\fR "Hello world" {} + \fI\(-> H e l l o { } w o r l d\fR .CE -returns \fB"H e l l o { } w o r l d"\fR. +.SS "PARSING RECORD-ORIENTED FILES" +.PP +Parse a Unix /etc/passwd file, which consists of one entry per line, +with each line consisting of a colon-separated list of fields: +.PP +.CS +## Read the file +set fid [open /etc/passwd] +set content [read $fid] +close $fid + +## Split into records on newlines +set records [\fBsplit\fR $content "\en"] + +## Iterate over the records +foreach rec $records { + ## Split into fields on colons + set fields [\fBsplit\fR $rec ":"] + + ## Assign fields to variables and print some out... + lassign $fields \e + userName password uid grp longName homeDir shell + puts "$longName uses [file tail $shell] for a login shell" +} +.CE .SH "SEE ALSO" join(n), list(n), string(n) - .SH KEYWORDS list, split, string +'\" Local Variables: +'\" mode: nroff +'\" End: |