将环境变量值导入文件 Shell 脚本

Question

I have an 12.sh file with the below code

cat > /home/12.txt << "EOF"
[Unit]
${OUTPUT}
EOF

OUTPUT is an environment variable i want to import its value into the 12.txt file when i execute 12.sh file

Any one can tell how to do, Thanks in advance

Answer 1

You don't need to use cat, just echo the data required are redirect the output to the file

echo -e "[Unit]\n$OUTPUT" > /home/12.txt