**Tcl Tutorial Index**

***Getting started***

[%|%Tcl Tutorial Lesson 0|Introduction%|%]

[%|%Tcl Tutorial Lesson 0a|Running Tcl%|%]

[%|%Tcl Tutorial Lesson 1|Simple Text Output%|%]

[%|%Tcl Tutorial Lesson 2|Assigning values to variables%|%]

[%|%Tcl Tutorial Lesson 3|Evaluation and Substitutions 1: Grouping arguments with ""%|%]

[%|%Tcl Tutorial Lesson 4|Evaluation and Substitutions 2: Grouping arguments with {}|%]

[%|%Tcl Tutorial Lesson 5|Evaluation and Substitutions 3: Grouping arguments with []%|%]

[%|%Tcl Tutorial Lesson 6|Results of a command - Math 101%|%]

[%|%Tcl Tutorial Lesson 6a|Computers and Numbers%|%]

***Flow Control***
[%|%Tcl Tutorial Lesson 7|Numeric Comparisons 101 - if%|%]

[%|%Tcl Tutorial Lesson 8|Textual Comparison - switch%|%]

[%|%Tcl Tutorial Lesson 9|Looping 101 - While loop%|%]

[%|%Tcl Tutorial Lesson 10|Looping 102 - For and incr%|%]

[%|%Tcl Tutorial Lesson 11|Adding new commands to Tcl - proc%|%]

[%|%Tcl Tutorial Lesson 12|Variations in proc arguments and return values%|%]

[%|%Tcl Tutorial Lesson 13|Variable scope - global and upvar%|%]

***Data Types***
[%|%Tcl Tutorial Lesson 14|Tcl Data Structures 101 - The list%|%]

[%|%Tcl Tutorial Lesson 15|Adding and Deleting members of a list%|%]

[%|%Tcl Tutorial Lesson 16|More list commands - lsearch, lsort, lrange%|%]

[%|%Tcl Tutorial Lesson 16a|Simple pattern matching - "globbing"%|%]

[%|%Tcl Tutorial Lesson 17|String Subcommands - length index range%|%]

[%|%Tcl Tutorial Lesson 18|String comparisons - compare match first last wordend%|%]

[%|%Tcl Tutorial Lesson 19|Modifying Strings - tolower, toupper, trim, format%|%]

[%|%Tcl Tutorial Lesson 20|Regular Expressions 101%|%]

[%|%Tcl Tutorial Lesson 20a|More Examples Of Regular Expressions%|%]

[%|%Tcl Tutorial Lesson 21|More Quoting Hell - Regular Expressions 102%|%]

[%|%Tcl Tutorial Lesson 22|Associative Arrays%|%]

[%|%Tcl Tutorial Lesson 23|More On Arrays - Iterating and use in procedures%|%]

[%|%Tcl Tutorial Lesson 23a|Dictionaries%|%]

***Input and Output***
[%|%Tcl Tutorial Lesson 24|File Access 101%|%]

[%|%Tcl Tutorial Lesson 25|Information about Files - file, glob%|%]

[%|%Tcl Tutorial Lesson 26|Invoking Subprocesses from Tcl - exec, open%|%]

***Introspection***
[%|%Tcl Tutorial Lesson 27|Learning the existence of commands and variables - info%|%]

[%|%Tcl Tutorial Lesson 28|State of the interpreter - info%|%]

[%|%Tcl Tutorial Lesson 29|Information about procs - info%|%]

***Modularization and Code Reuse***
[%|%Tcl Tutorial Lesson 30|Modularization - source%|%]

[%|%Tcl Tutorial Lesson 31|Building reusable libraries - packages and namespaces%|%]

***Further Topics***
[%|%Tcl Tutorial Lesson 32|Creating Commands - eval%|%]

[%|%Tcl Tutorial Lesson 33|More command construction - format, list%|%]

[%|%Tcl Tutorial Lesson 34|Substitution without evaluation - format, subst%|%]

[%|%Tcl Tutorial Lesson 35|Changing Working Directory - cd, pwd%|%]

[%|%Tcl Tutorial Lesson 36|Debugging and Errors - errorInfo errorCode catch error return%|%]

[%|%Tcl Tutorial Lesson 37|More Debugging - trace%|%]

[%|%Tcl Tutorial Lesson 38|Command line arguments and environment strings%|%]

[%|%Tcl Tutorial Lesson 39|Leftovers - time, unset%|%]

[%|%Tcl Tutorial Lesson 40|Channel I/O: socket, fileevent, vwait%|%]

[%|%Tcl Tutorial Lesson 41|Time and Date - clock%|%]

[%|%Tcl Tutorial Lesson 42|More channel I/O - fblocked and fconfigure%|%]

[%|%Tcl Tutorial Lesson 43|Child interpreters%|%]