Bash java auto compiler

Question

I am currently trying to make a bash script that will go into every folder in ./ and compile blah.java, then run blah sending in a number for an input, and put the output in a file that I have named. I have something that is somewhat functional, but it only goes into the first directory, and after that it fails on me. I currently have...

#! /bin/bash


for i in $(find . -maxdepth 1 -type d)
do

    pwd
    cd $i
    pwd

    if [ -f "blah.java" ];
    then
        javac -cp . blah.java
        echo "17" | java -cp . blah - > blahresult17
        echo "43" | java -cp . blah - > blahresult43

    fi

done

I think it is having problems, because it is trying to go into a directory from ./ once it goes into a subdirectory, but obviously from the subdirectory it doesn't exist.

it seems like you could use javac task of ant rather than writing a script — bobah
– bobah, Commented Oct 16, 2012 at 14:33

Brian · Accepted Answer · 2012-10-16 14:24:40Z

1

You're missing a fi on your if, but that's presumably a cut and paste error, not the source of your failure. The likely problem is that once you do the first cd, the following cd commands are relative to where you were, not where you are now. You can work around this with pushd/popd instead, or running the cd and java bits in a subshell so that the cd does not persist to the next loop iteration.

answered Oct 16, 2012 at 14:24

Brian

1613 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

yiati Over a year ago

Yes that was a cut/paste error. You were correct that it didn't go back up a directory

Joachim Sauer · Accepted Answer · 2012-10-16 14:31:06Z

1

You cd into the directory but never cd out of it.

My suggestion: use pushd/popd instead of cd.

Replace cd $i with pushd "$i" and put popdat the end of your loop.

Also for dir in */ would be a simpler solution to iterating all directories in the current directory.

edited Oct 16, 2012 at 14:31

answered Oct 16, 2012 at 14:22

Joachim Sauer

309k59 gold badges568 silver badges624 bronze badges

Comments

BenjaminBallard · Accepted Answer · 2014-04-25 18:27:40Z

0

This is another way, if you wanted to compile all the files with one invocation of javac, which allows javac to handle dependencies:

SRC=`find src -name "*.java"`
if [ ! -z $SRC ]; then
    javac -classpath $CLASSPATH -d obj $SRC
    # stop if compilation fails
    if [ $? != 0 ]; then exit; fi
fi

answered Apr 25, 2014 at 18:27

BenjaminBallard

1,48212 silver badges11 bronze badges

Collectives™ on Stack Overflow

Bash java auto compiler

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related