Linux Filesystem Hierarchy

STDERR
Standard error. A special type of output used for error messages. The file descriptor for STDERR is 2.
STDIN
Standard input. User input is read from STDIN. The file descriptor for STDIN is 0.
STDOUT
Standard output. The output of scripts is usually to STDOUT. The file descriptor for STDOUT is 1.
symbol table
The part of an object table that gives the value of each symbol (usually as a section name and an
offset) is called the symbol table. Executables may also have a symbol table, with this one giving the
final values of the symbols. Debuggers use the symbol table to present addresses to the user in a
Linux Filesystem Hierarchy
Glossary
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symbolic, rather than a numeric form. It is possible to strip the symbol table from executables
resulting in a smaller sized executable but this prevents meaningful debugging.