Links: differences in syntax: Perl, tcl, Shell, C++, Python, Java, Javascript, Lisp

I have already mentioned in my post on comparing numbers and strings in shell, about problems of simultaneous use of different programming languages.

To conclude, having reference cards with description one language to another differences can be useful.

Listed is set of resources, intended for migration from one language to another.

Recommended (short,self-descriptive, useful):
languages comparison:
http://merd.sourceforge.net/pixel/language-study/syntax-across-languages/

Recommended, but not short:
Wikipedia page:
http://en.wikipedia.org/wiki/Comparison_of_programming_languages
Open directory listing for comparisons:
http://www.dmoz.org/Computers/Programming/Languages/Comparison_and_Review/
PLEAC - Programming Language Examples Alike Cookbook
Comparison of productivity of writing in different programming languages:
page.mi.fu-berlin.de/~prechelt/Biblio/jccpprtTR.pdf

Useful:
Java for c++ Programmers:
http://pages.cs.wisc.edu/~hasti/cs368/JavaTutorial/
http://triton.towson.edu/~mzimand/os/Lect2-java-tutorial.html
Lisp to javascript converter, descriptive.
http://javascript.crockford.com/little.html
Another one Lisp to Javascript converter written in javascript.( You can look into source to look into the code)
http://www.joeganley.com/code/jslisp.html

Comparison Python with Java, Lisp i.t.c.

http://wiki.python.org/moin/LanguageComparisons

Three scripting concurrents:
http://mjtsai.com/blog/2002/11/25/perl_vs_python_vs_ruby/

Accumulator generator in different languages:
http://www.paulgraham.com/accgen.html

Tcl vs. Python, with nice short examples

http://homepages.cwi.nl/~sjoerd/PythonVsTcl-old.html

This thread describes differences between bash and perl.
http://www.perlmonks.org/?node_id=661859

And at the end resource with language comparison in action (memory, speed, size).
http://shootout.alioth.debian.org/