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Scripting Languages

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  1. Scripting Languages Henning Schulzrinne Advanced Programming Advanced Programming Spring 2002

  2. Scripting languages • Not a well-defined term • Derived from shell (command line) scripts • Often typed directly by user • Usually no compile-link-run cycle, but interpreted or compiled “just in time” (JIT) Advanced Programming Spring 2002

  3. Scripting languages • Often loosely typed • no explicit variable and type declaration • variables treated as strings or numbers according to context • Dynamic memory allocation with automatic garbage collection • Text processing: regular expressions, sorting, ... • Procedural, but often with OO or namespace extensions • Some (Tcl, sh) derived from substitution instead of evaluation • Some (Tcl, Perl, Python) allow mixed-language programming Advanced Programming Spring 2002

  4. Scripting languages • We’ll look at typical examples: • sh, bash – the first one • sed – pattern editing • awk – pattern language • Perl – a real language for string processing • Tcl – shell-like, easy extensible, graphical GUI • Python – modern OO-oriented Advanced Programming Spring 2002

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