Introduction To Tcl

• Command_Manual
  • Tcl Commands
  • Modeling_Commands
    • model
    • uniaxialMaterial
    • ndMaterial
    • frictionModel
    • section
    • geometricTransf
    • element
    • node
    • sp commands
      • fix
      • fixX
      • fixY
      • fixZ
    • mp commands
      • equalDOF
      • rigidDiaphragm
      • rigidLink
    • timeSeries
    • pattern
    • mass
    • block commands
      • block2D
      • block3D
    • region
    • rayleigh
  • Analysis Commands
    • constraints Command
    • numberer Command
    • system Command
    • test Command
    • algorithm Command
    • integrator Command
    • analysis Command
    • eigen Command
    • analyze Command
  • Output Commands
    • recorder
    • record
    • print
    • printA
    • logFile
    • RealTime_Output_Commands
  • Misc Commands
    • eleResponse Command
    • getTime Command
    • getEleTags Command
    • getNodeTags
    • loadConst Command
    • nodeCoord Command
    • nodeDisp Command
    • nodeVel Command
    • nodeAccel Command
    • nodeEigenvector Command
    • nodeBounds
    • print Command
    • remove Command
    • reset Command
    • testIter
    • testNorms
    • wipe Command
    • exit Command
  • DataBase Commands
    • Template:DataBaseCommandsMenu

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Tcl is a string-based command language with relatively little syntax. Tcl scripts are made up of commands separated by new lines or semicolon (;). The basic syntax for a Tcl command is:

command arg1 arg2 arg3 ...

command	is name of the command
$arg1 $arg2 $arg3 ...	are the arguments for the command

The command is either the name of a built-in command or a Tcl procedure defined previously by the user. White space (i.e., space or tab) is used to separate the command name and its arguments, and a newline or semicolon is used to terminate a command. The arguments to a command are just strings.

Tcl has syntax for grouping, which allows multiple words in one argument, and substitution, which is used with programming variables and nested command calls. The Tcl interpreter does grouping first, then substitutions, and finally it calls the command. It is up to the command to interpret its arguments.