inject file inline to command with heredoc

inline_file_as_string_heredoc.sh

# https://stackoverflow.com/a/38731052

# variable substitution, leading tab retained, overwrite file, echo to stdout

tee /path/to/file <<EOF
${variable}
EOF


# no variable substitution, leading tab retained, overwrite file, echo to stdout

tee /path/to/file <<'EOF'
${variable}
EOF


# variable substitution, leading tab removed, overwrite file, echo to stdout

tee /path/to/file <<-EOF
    ${variable}
EOF


# variable substitution, leading tab retained, append to file, echo to stdout

tee -a /path/to/file <<EOF
${variable}
EOF


# variable substitution, leading tab retained, overwrite file, no echo to stdout

tee /path/to/file <<EOF >/dev/null
${variable}
EOF


# the above can be combined with sudo as well

sudo -u USER tee /path/to/file <<EOF
${variable}
EOF