Is it possible to create and execute a file without having to type the file name twice?

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Yes, it is possible to create and execute a file without having to type the file name twice by making use of shell variables. One way to do this is by setting a variable to the file name and using it to both create and execute the file. For example, suppose we want to create a file called "hello.sh" and execute it. We could do the following:

#!/bin/bash
filename="hello.sh"

# create file
cat << EOF > $filename
#!/bin/bash
echo "Hello, world!"
EOF

# make file executable
chmod +x $filename

# execute file
./$filename

In this example, we set the variable "filename" to "hello.sh" and use it to both create and execute the file. By using the "./" shortcut to execute the file, we don't need to type the filename twice.