This is pretty basic, I have a folder with several subfolders of JS files and i want to run Google's Clojure compiler on all of the files in those folders. The command to process a single file is as follows:
java -jar compiler.jar --js filename.js --js_output_file newfilename.js
How do I modify this to run on every JS file in my directory structure?
You can use find:
find . -name "*.js" -exec java -jar compiler.jar --js {} --js_output_file new{} \;
mv the file to the original name.
– Anthon
Jun 27 '13 at 8:07
find -name '*.js' | while read jsfile; do java -jar compiler.jar --js "$jsfile" --js_output_file "new$jsfile" && mv "new$jsfile" "$jsfile"; done should do the trick.
– David Baggerman
Jun 27 '13 at 8:17
find -exec is great for simple commands. for complex ones find | xargs is much better and also it allows to run commands in parallel.
– rush
Jun 27 '13 at 8:22
You can also use a simple for loop, especially if the files are within a single directory (no subdirectories). It can be modified to work with subdirectories as well.
Without recursion:
for filename in ./*.js
do
java -jar compiler.jar --js "${filename}" --js_output_file "new${filename}"
done
or as an equivalent one-liner:
for filename in ./*.js; do java -jar compiler.jar --js "${filename}" --js_output_file "new${filename}"; done
To recurse into subdirectories (requires GNU bash 4.0 or newer) (thanks @ChrisDown):
shopt -s globstar
for filename in ./**/*.js; do
java -jar compiler.jar --js "${filename}" --js_output_file "new${filename}"
done
globstar to do so.
– Chris Down
Jun 27 '13 at 7:58
** can match an arbitrary level of recursion, **/*.js works: sprunge.us/PXQK
– Chris Down
Jun 27 '13 at 9:02
for f in ./*.js; do or for f in ./**/*.js; do in order to protect yourself from filenames beginning with a - (I don't know if that's necessary in this case, but it's a good habit anyway).
– evilsoup
Jun 27 '13 at 16:01
