How to manage the file path in big project
to manage the file path in big project :en:engineering:software:bash:
It's not good practice to use relative path in big project.
- If file B refer to file A with "../A". Then B's position in the project *CANNOT be changed. Or else its reference to A will be wrong.
- Relative path is not intuitive when debugging.
- If the dependency is complex. Figure out the right path is mission impossible. For example, file A refer to file B with "./a/../../B" and file B refer to file C "../../b/C".
So you should ALWAYS use the absolute path.
Absolute path is tedious to type and not portable.
It could be improved a little bit be use an environment variable to replace the common prefix of the full path.
For example, we can replace absolute path "/home/cb/projects/app1/src/test.c" with "$TTAGROOT/src/test.c", if the value of environment variable TTAGROOT is "/home/cb/projects/app1".
Insert below code into ~/.bashrc so TTAGROOT value is set when you logged into bash:
In you script to do the real job, you could make TTAGROOT optional and still use your full path happily. It's just one bash liner.
Here is a sample file named test.sh:
#!/bin/bash [ -z "$TTAGROOT" ] && TTAGROOT="hard-coded-full-path" echo "TTAGROOT = $TTAGROOT"
You could use test.sh without $TTAGROOT. Or you can set up default value of $TTAGROOT in ~/.bashrc as I already mentioned.
Or you can override the TTAGROOT value when you executing "test.sh":
BTW, don't abuse this technique. Set one environment variable for the root directory of project is enough.