otool
otool is a command-line utility for displaying specified parts of object files or libraries on macOS and other Unix-like systems. It is primarily used for analyzing Mach-O (Mach Object) file formats, which are the standard executable format on Apple platforms like macOS and iOS. The tool provides detailed information about headers, sections, symbols, and dependencies, making it essential for debugging, reverse engineering, and binary analysis.
Developers should learn otool when working on macOS or iOS applications to inspect binary files, verify code signatures, check for architecture compatibility, or analyze dependencies. It is particularly useful for debugging linking issues, ensuring proper code signing for App Store submissions, and reverse-engineering third-party libraries to understand their structure and behavior.