expression

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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Q. How do I ignore hidden .dot files while searching for files? How do I ignore or exclude certain files while running Linux / UNIX find command?

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I see [ command in /usr/bin directory. What is the /usr/bin/[ command used for?

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