**String Subcommands - length index range**
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Tcl commands often have "subcommands". The `string` command is an example of one of these. The `string` command treats its first argument as a subcommand. Utilizing subcommands is a good way to make one command do multiple things without using cryptic names. For instance, Tcl has `string length` instead of, say, `slength`.
Here we cover these string subcommands:
`string length str`: Returns the length of `str`.
`string index str i`: Returns the `i`'th character from `str`.
`string range str first last`: Returns a string composed of the characters from `first` to `last` taken from `str`.
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***Example***
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set string "this is my test string"
puts "There are [string length $string] characters in \"$string\""
puts "[string index $string 1] is the second character in \"$string\""puts "Second character in \"$string\"" is [string index $string 1]"
puts "Substring from 5th to 10th: \"[string range $string 5 10]\""
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<<discussion>> Resulting output
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There are 22 characters in "this is my test string"
Second character in "this is my test string" is h
Substring from 5th to 10th: "is my"
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<<enddiscussion>>
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