What does the command “$ls | wc –l > file1” do?

Ls becomes the input to wc which counts the number of lines it receives as input and instead of displaying this count , the value is stored in file1.

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Mar 6th, 2005
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sangee

Nov 15th, 2006

first ls command will list all the files in the current dir.then
that result is fed to wc -l which will count the number of lines fed
by the input(ie ls ),now finally the result which is the number of lines is fed to the file1.