split(n) Tcl Built-In Commands split(n)
NAME
split - Split a string into a proper Tcl list
SYNOPSIS
split string ?splitChars?
DESCRIPTION
Returns a list created by splitting string at each character that is in
the splitChars argument. Each element of the result list will consist
of the characters from string that lie between instances of the charac-
ters in splitChars. Empty list elements will be generated if string
contains adjacent characters in splitChars, or if the first or last
character of string is in splitChars. If splitChars is an empty string
then each character of string becomes a separate element of the result
list. SplitChars defaults to the standard white-space characters.
EXAMPLES
Divide up a USENET group name into its hierarchical components:
split "comp.lang.tcl" .
-> comp lang tcl
See how the split command splits on every character in splitChars,
which can result in information loss if you are not careful:
split "alpha beta gamma" "temp"
-> al {ha b} {} {a ga} {} a
Extract the list words from a string that is not a well-formed list:
split "Example with {unbalanced brace character"
-> Example with \{unbalanced brace character
Split a string into its constituent characters
split "Hello world" {}
-> H e l l o { } w o r l d
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:
## 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" }
SEE ALSO
join(n), list(n), string(n)
KEYWORDS
list, split, string
Tcl split(n)
tcl 8.6.0 - Generated Fri Jan 11 15:35:56 CST 2013