Ubuntu: Creating a file with some content in Shell scripting



Question:

I'm a little new to Shell Scripting and I want to create a new file inside the script and want to add content and then close it. It should not take the arguments from the user. Everything from the path and content is predefined. Was it possible?


Solution:1

Just use output redirection. E.g.

#!/bin/bash    echo "some file content" > /path/to/outputfile  

The > will write all stdin provided by the stdout of echo to the file outputfile here.

Alternatively, you could also use tee and a pipe for this. E.g.

echo "some file content" | tee outputfile  

Be aware that any of the examples will overwrite an existing outputfile.

If you need to append to a currently existing file, use >> instead of > or tee -a.

If you don't accept user input in this line, no user input can change the behaviour here.


Solution:2

I think it is superior to use a here doc to create a new file in a script. It is cleaner looking, which I believe encourages readability.

For example:

cat > filename <<- "EOF"  file contents  more contents  EOF  

The "-" in <<- is optional, allowing for tabbed indents which will be stripped when the file is created. The quotes around the "EOF" prevent the "here doc" from doing any substitutions.


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