Henning Schulzrinne Advanced Programming

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Henning Schulzrinne Advanced Programming Scripting Languages Henning Schulzrinne Advanced Programming 8-Nov-18 Advanced Programming Spring 2002

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) 8-Nov-18 Advanced Programming Spring 2002

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 8-Nov-18 Advanced Programming Spring 2002

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 8-Nov-18 Advanced Programming Spring 2002