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Sometimes I'd like to know if a binary - the actual executable, either a command-line tool or the binary in an app-bundle (mybundle.app/Contents/MacOS/xyz) - uses a particular library (dll in windows-world, dylib in macOS world).
I found this to be the easiest way to do this:
otool -L <thebinary>
For example, to see what libraries the command-line tool "diskutil" uses:
otool -L /usr/sbin/diskutil
Which gives a list like below, showing the used libraries:
/usr/lib/libcsfde.dylib (compatibility version 1.0.0, current version 1.0.0)
/usr/lib/libCoreStorage.dylib (compatibility version 1.0.0, current version 1.0.0)
/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation (compatibility version 300.0.0, current version 1570.15.0)
/System/Library/Frameworks/IOKit.framework/Versions/A/IOKit (compatibility version 1.0.0, current version 275.0.0)
/System/Library/PrivateFrameworks/DiskManagement.framework/Versions/A/DiskManagement (compatibility version 1.0.0, current version 1.0.0)
/System/Library/Frameworks/DiscRecording.framework/Versions/A/DiscRecording (compatibility version 1.0.0, current version 1.0.0)
/usr/lib/libncurses.5.4.dylib (compatibility version 5.4.0, current version 5.4.0)
/System/Library/Frameworks/DiskArbitration.framework/Versions/A/DiskArbitration (compatibility version 1.0.0, current version 1.0.0)
/usr/lib/libicucore.A.dylib (compatibility version 1.0.0, current version 62.1.0)
/usr/lib/libobjc.A.dylib (compatibility version 1.0.0, current version 228.0.0)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1252.250.1)
/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (compatibility version 150.0.0, current version 1570.15.0)
