Tcl tutorials

Tcl (Tool Command Language) is a powerful, interpreted scripting language designed for ease of use and rapid development. Known for its simplicity and flexibility, Tcl is widely used for scripting, automation, and GUI development with Tk.

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Tcl provides a straightforward syntax for tasks like string manipulation, list processing, and file operations. Its integration with Tk enables the creation of cross-platform graphical user interfaces, making it a popular choice for desktop applications.

Tcl is commonly used for system administration scripts, testing automation, and embedded systems, offering extensibility through packages and a robust community for support.

Read introductory Tcl tutorial and Tcl Tk tutorial .

Core Tcl commands

• Tcl set Command

• Tcl unset Command

• Tcl incr Command

• Tcl append Command

• Tcl lappend Command

• Tcl array Command

• Tcl dict Command

• Tcl namespace Command

• Tcl variable Command

• Tcl global Command

• Tcl if Command

• Tcl else Command

• Tcl elseif Command

• Tcl while Command

• Tcl for Command

• Tcl foreach Command

• Tcl switch Command

• Tcl break Command

• Tcl continue Command

• Tcl return Command

• Tcl puts Command

• Tcl gets Command

• Tcl read Command

• Tcl open Command

• Tcl close Command

• Tcl flush Command

• Tcl seek Command

• Tcl tell Command

• Tcl eof Command

• Tcl proc Command

• Tcl source Command

• Tcl eval Command

• Tcl apply Command

• Tcl uplevel Command

• Tcl upvar Command

• Tcl catch Command

• Tcl error Command

• Tcl try Command

• Tcl finally Command

• Tcl exit Command

• Tcl exec Command

• Tcl pid Command

• Tcl after Command

• Tcl time Command

• Tcl clock Command

• Tcl info Command

• Tcl trace Command

• Tcl rename Command

• Tcl interp Command

• Tcl string Command

• Tcl format Command

• Tcl scan Command

• Tcl binary Command

• Tcl regexp Command

• Tcl regsub Command

• Tcl list Command

• Tcl lindex Command

• Tcl llength Command

• Tcl lrange Command

• Tcl linsert Command

• Tcl lreplace Command

• Tcl lsearch Command

• Tcl lsort Command

• Tcl concat Command

• Tcl join Command

• Tcl split Command

• Tcl expr Command

• Tcl mathfunc Command

• Tcl mathop Command

• Tcl file Command

• Tcl glob Command

• Tcl cd Command

• Tcl pwd Command

• Tcl package Command

• Tcl history Command

• Tcl unknown Command

• Tcl auto_load Command

• Tcl auto_execok Command

• Tcl auto_reset Command

• Tcl vwait Command

• Tcl http Package

last modified April 21, 2025