rename command

I‘ve over 1000′s of files starting with _ character as follows:

_file1.txt
_foo1.txt
_2424.txt
_bar10000.txt

How do I remove the first character from a file name:

file1.txt
foo1.txt
2424.txt
bar10000.txt

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How do I rename a file called resume.docz to resume.doc? I would like to rename a .txt file as .doc file. How do I rename a file called foo.txt to foo.doc under Linux / Unix / Apple OS X / *BSD operating systems using the command prompt?

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