How can I compare all files in two directories and copy the ones that are different to another directory? For example, say we have dir1 and dir2:dir1:     build.gradle     gradle.properties     somejar.jar     javacode.java     anotherjar.jardir2:     build.gradle      <-- different from build.gradle in dir1     gradle.properties     somejar.jar     javacode.java     <-- different from javacode.java in dir1     yetanotherjar.jarHow may I create a new directory dir3 that contains the different files from dir2, the common files in dir1 and dir2 and all uncommon files in both dir1 and dir2? dir3 should contain:dir3:     build.gradle      <-- from dir2     gradle.properties <-- these are common files both in dir1 and dir2     somejar.jar       <--     javacode.java     <-- from dir2     anotherjar.jar    <-- from dir1     yetanotherjar.jar <-- from dir2
Comparing each file in two directories and copying it to another if it differs from its counterpart
shell;file copy
All you need iscp -n dir2/* dir1/* dir3/