These are the commands which modify a string. Note that none of these modify the string in place. In all cases a new string is returned.
string tolower stringstring with all the letters
converted from upper to lower case.string toupper stringstring with all the letters
converted from lower to upper case.string trim string ?trimChars?string with all occurrences of
trimChars removed from both ends. By
default trimChars are whitespace (spaces,
tabs, newlines). Note that the characters are not treated as a
"block" of characters - in other words, string trim "davidw"
dw would return the string avi and not
davi.string trimleft string ?trimChars?string with all occurrences of
trimChars removed from the left. By
default trimChars are whitespace (spaces,
tabs, newlines)string trimright string ?trimChars?string with all occurrences of
trimChars removed from the right. By
default trimChars are whitespace (spaces,
tabs, newlines)format formatString ?arg1 arg2 ...
argN?sprintf procedure. FormatString is a description of the formatting to
use. The full definition of this protocol is in the format man page. A useful subset of the definition
is that formatString consists of literal
words, backslash sequences, and %
fields. The % fields are
strings which start with a % and end
with one of:
s... Data is a stringd... Data is a decimal
integerx... Data is a hexadecimal
integero... Data is an octal integerf... Data is a floating point
number% may be followed by:
-... Left justify the data in this
field+... Right justify the data in
this fieldset upper "THIS IS A STRING IN UPPER CASE LETTERS" set lower "this is a string in lower case letters" set trailer "This string has trailing dots ...." set leader "....This string has leading dots" set both "((this string is nested in parens )))" puts "tolower converts this: $upper" puts " to this: [string tolower $upper]\n" puts "toupper converts this: $lower" puts " to this: [string toupper $lower]\n" puts "trimright converts this: $trailer" puts " to this: [string trimright $trailer .]\n" puts "trimleft converts this: $leader" puts " to this: [string trimleft $leader .]\n" puts "trim converts this: $both" puts " to this: [string trim $both "()"]\n" set labels [format "%-20s %+10s " "Item" "Cost"] set price1 [format "%-20s %10d Cents Each" "Tomatoes" "30"] set price2 [format "%-20s %10d Cents Each" "Peppers" "20"] set price3 [format "%-20s %10d Cents Each" "Onions" "10"] set price4 [format "%-20s %10.2f per Lb." "Steak" "3.59997"] puts "\n Example of format:\n" puts "$labels" puts "$price1" puts "$price2" puts "$price3" puts "$price4"