**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%|%]