Readelf is a command for analyzing ELF files, such as executables or shared objects, which is available in Linux-based operating systems. It is part of GNU binutils. To display ELF headers, we can use the following command: 

readelf -h <binary_file>

To display the program header, we can use the -l flag or the --program-headers flag.  Displaying section headers, we can use the -S or --section-headers flag. 

Other Useful Flags:

• -s or --symbols: Display symbol table entries. This flag displays all function or variable names

• -r or --relocs :  It will display relocation entries.

• -d or --dynamic: This flag display dynamic section, it will provide information about required shared libraries, symbol and string tables, initialization and termination functions, runtime flags.

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