自动编译Bash脚本无法正常工作

Question

Simply put, I want to manually compile Java files through the command line, but don't want to do it for each directory. I tried to write this script but it doesn't seem to work.

CUR=$PWD                              # save workspace directory to return
for line in `find -type d -name src`  # find and loop through src paths
do
    eval cd $line                     # go to src
    eval javac *.java
    eval jar *.class                  # I need to have a jar for my project
    eval mv ../bin/                   
    cd $CUR
done

Answer 1

I don't think you need to use eval at all in that script.

But one problem is probably that your source directories are not all called src (or are they?) What is your directory structure like?

Also you probably need to have a single jar for your project, not multiple jars, so that bit won't work either.

You should probably look into using a real Java build tool such as Ant or Maven; they solved this problem over a decade ago.

Answer 2

Some improvements to your existing script:

for line in $(find -type d -name src)  # find and loop through src paths
do
    (
    cd $line                     # go to src
    javac *.java
    jar *.class                  # I need to have a jar for my project
    mv ../bin/                   
    )
done

Use parenthesis to execute the inner part in a subshell and avoid cd issues. Also I see no reason for eval .

Are you sure all your java files are all directly in a folder called src without any package structure? Are you sure they need no further classpath information to compile?

What exactly is the problem, that makes you think it does not work?

Is there a good reason, why you are not using grade, maven, or ant to build your project?

(Feel free to simply update the question as a response to the questions.)