Comparing strings

In any of the programs, string comparison is critical for many reasons. To perform string comparison, Tcl provides two keywords for use with the string command—compare and equal. The syntax for the first keyword compare is as follows:

string compare nocase length string1 string2

When invoked with the compare keyword, the string command performs a character-by-character comparison of the strings passed in string1 and string2.

The string command accepts two switches as mentioned here:

• -nocase

  Strings are compared in a case-insensitive manner

• -length

  Instructs the interpreter to perform the comparison only on the first length characters

Getting ready

To complete the following example, we will need to create a Tcl script file in your working directory. Open the text editor of your choice and follow the given instructions.

How to do it…

In the following example, we will create a Tcl script to accept a string value to compare against a static value. In this method, you can see...