Linux cmd to search for a class file among jars irrespective of jar path

Question

I want to search for a particular class file among many jar files without giving the location of each jar file   Is this possible with a simple command   I tried this command   grep Hello class   jar   Which did not return a list of jars containing the class  Then I ran the command   grep Hello class  full path of jar file   jar   Which did return the relevant jar file   Is there a better way

User · Accepted Answer

Where are you jar files  Is there a pattern to find where they are   1  Are they all in one directory   For example  foo a a jar and foo b b jar are all under the folder foo   in this case  you could use find with grep   find foo  -name    jar    xargs grep Hello class   Sure  at least you can search them under the root directory    but it will be slow   As  loganaayahee said  you could also use the command locate  locate search the files with an index  so it will be faster  But the command should be   locate    jar    xargs grep Hello class   Since you want to search the content of the jar files   2  Are the paths stored in an environment variable   Typically  Java will store the paths to find jar files in an environment variable like CLASS PATH  I don t know if this is what you want  But if your variable is just like this CLASS PATH  lib  usr lib  bin  which use a   to separate the paths  then you could use this commend to search the class   for P in  echo  CLASS PATH   sed  s     g    do grep Hello calss  P   jar  done

User · Answer

Just go to the directory which contains jars and insert below command   find   jar   xargs grep className class   Hope this helps

User · Answer

Linux  Walkthrough to find a class file among many jars   Go to the directory that contains the jars underneath   eric dev  home el kafka 2 10-0 8 1 1 libs   ls blah txt                             metrics-core-2 2 0 jar jopt-simple-3 2 jar                  scala-library-2 10 1 jar kafka 2 10-0 8 1 1-sources jar       zkclient-0 3 jar kafka 2 10-0 8 1 1-sources jar asc   zookeeper-3 3 4 jar log4j-1 2 15 jar   I m looking for which jar provides for the Producer class   Understand how the for loop works   eric dev  home el kafka 2 10-0 8 1 1 libs   for i in  seq 1 3   do  gt  echo  i  gt  done 1 2 3   Understand why find this works   eric dev  home el kafka 2 10-0 8 1 1 libs   find   -name    jar    slf4j-api-1 7 2 jar   zookeeper-3 3 4 jar   kafka 2 10-0 8 1 1-javadoc jar   slf4j-1 7 7 osgi-over-slf4j-1 7 7-sources jar   You can pump all the jars underneath into the for loop   eric dev  home el kafka 2 10-0 8 1 1 libs   for i in  find   -name    jar    do  gt  echo  i  gt  done    slf4j-api-1 7 2 jar   zookeeper-3 3 4 jar   kafka 2 10-0 8 1 1-javadoc jar   kafka 2 10-0 8 1 1-sources jar   Now we can operate on each one   Do a jar tf on every jar and cram it into blah txt   for i in  find   -name    jar    do echo  i  jar tf  i  done  gt  blah txt   Inspect blah txt  it s a list of all the classes in all the jars   You can search that file for the class you want  then look for the jar that came before it  that s the one you want

User · Answer

Most of the solutions are directly using grep command to find the class  However  it would not give you the package name of the class  Also if the jar is compressed  grep will not work   This solution is using jar command to list the contents of the file and grep the class you are looking for   It will print out the class with package name and also the jar file name    find   -type f -name    jar  -print0    xargs -0 -I      sh -c  jar tf      grep Hello class  amp  amp   echo       You can also search with your package name like below   find   -type f -name    jar  -print0    xargs -0 -I      sh -c  jar tf      grep com mypackage Hello class  amp  amp   echo

User · Answer

eric dev  home el kafka 2 10-0 8 1 1 libs   for i in  find   -name    jar    do  gt  echo  i  gt  done    slf4j-api-1 7 2 jar   zookeeper-3 3 4 jar   kafka 2 10-0 8 1 1-javadoc jar   kafka 2 10-0 8 1 1-sources jar

User · Answer

I have used this small snippet  Might be slower but works every time   for i in  find   -type f -name    jar    do     jar tvf  i   grep  com foo bar MyClass clss       if      -eq 0    then echo  i  fi  done

User · Answer

locate   jar   grep Hello class jar   The locate command to search the all path of the particular file and display full path of the file   example  locate   jar   grep classic jar   opt ltsp i386 usr share firefox chrome classic jar   opt ltsp i386 usr share thunderbird chrome classic jar   root  wine drive c windows gecko 0 1 0 wine gecko chrome classic jar   usr lib firefox-3 0 14 chrome classic jar   usr lib firefox-3 5 2 chrome classic jar   usr lib xulrunner-1 9 1 2 chrome classic jar   usr share firefox chrome classic jar   usr share thunderbird chrome classic jar

User · Answer

Use deepgrep and deepfind  On debian-based systems you can install them by   sudo apt-get install strigi-utils   Both commands search for nested archives as well  In your case the command would look like   find   -name    jar    xargs -I    deepfind      grep Hello class

[linux] Linux cmd to search for a class file among jars irrespective of jar path

1. Are they all in one directory?

2. Are the paths stored in an environment variable?

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