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@@ -45,20 +45,22 @@ breadcrumbs:
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### Executables
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- Show type and info: `file <executable>`
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+ - Shows e.g. if it's an ELF executable, target architecture, if dynamically linked, which ELF interpreter to use, if it's stripped etc.
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- Show library dependencies (for glibc): `ldd <executable>`
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- It lists shared library file names and memory location to map it to, or "statically linked" if no dynamic dependencies.
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- - Alternatively, run the executable with envvar `LD_TRACE_LOADED_OBJECTS=1` set instruct glibc to print dependencies and exit. This is basically how `ldd` works internally, but with more options.
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- - Warning: This might execute the program if not using glibc.
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+ - Alternatively, run the executable with env var `LD_TRACE_LOADED_OBJECTS=1` set to instruct glibc (**TODO** the loader/interpreter?) to print dependencies and exit (this is normally how `ldd` works internally).
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+ - Warning: Never use this on untrusted executables, they may bypass the expected behavior and run malicious code instead.
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- Show printable character strings in the executable: `strings -a <executable>`
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- Run application and show dynamic library calls: `ltrace <executable> [args]`
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- Run application and show system calls: `strace <executable> [args]`
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- Strip the symbol table and debug info from an executable: `strip <executable>`
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- Without certain options, it will still keep some useful info in the file.
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- Rebuild the symbol table for a statically linked executable: See `gensymtab`.
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+- Show symbols (object files only): `nm <file>`
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### File Systems and Logical Volume Managers
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-- Partition disk: `gdisk <dev>` or `fdisk <dev>`
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+- Partition disk (TUI): `gdisk <dev>` or `fdisk <dev>`
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- Create filesystem: `mkfs.<fs> <dev>`
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- Modify fstab:
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- Test it with `mount -a` to make sure it doesn't have errors that may cause boot to fail.
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Nordstrand