Create file without replacing variables:
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cat <<'EOF' > /path/file ============================ My name is ${0} I was input via user data ============================ EOF |
If you check /path/file you will see exactly the content above.
Create file REPLACING the variables while creating:
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cat <<EOF > /path/file ============================ My name is ${0} I was input via user data ============================ EOF |
In this example, the variable ${0} will be replaced during the creation of the file, hence the content will display your username.