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# Create the file for this example cat > my_file.txt << 'EOF' Understanding Shells A shell is a text-based interface that lets you talk to your computer. There are different types of shells. Bash (Bourne Again SHell) is popular because it's powerful and easy to use. EOF grep '^[A-Za-z]' my_file.txt
Understanding Shells
A shell is a text-based interface that lets you talk to your computer.
There are different types of shells. Bash (Bourne Again SHell)
is popular because it's powerful and easy to use.