python2.5 --version (return code: 0)
Python 2.5.6
python2.5 --help (return code: 0)
usage: python2.5 [option] ... [-c cmd | -m mod | file | -] [arg] ...
Options and arguments (and corresponding environment variables):
-c cmd : program passed in as string (terminates option list)
-d : debug output from parser (also PYTHONDEBUG=x)
-E : ignore environment variables (such as PYTHONPATH)
-h : print this help message and exit (also --help)
-i : inspect interactively after running script, (also PYTHONINSPECT=x)
and force prompts, even if stdin does not appear to be a terminal
-m mod : run library module as a script (terminates option list)
-O : optimize generated bytecode (a tad; also PYTHONOPTIMIZE=x)
-OO : remove doc-strings in addition to the -O optimizations
-Q arg : division options: -Qold (default), -Qwarn, -Qwarnall, -Qnew
-S : don't imply 'import site' on initialization
-t : issue warnings about inconsistent tab usage (-tt: issue errors)
-u : unbuffered binary stdout and stderr (also PYTHONUNBUFFERED=x)
see man page for details on internal buffering relating to '-u'
-v : verbose (trace import statements) (also PYTHONVERBOSE=x)
-V : print the Python version number and exit (also --version)
-W arg : warning control (arg is action:message:category:module:lineno)
-x : skip first line of source, allowing use of non-Unix forms of #!cmd
file : program read from script file
- : program read from stdin (default; interactive mode if a tty)
arg ...: arguments passed to program in sys.argv[1:]
Other environment variables:
PYTHONSTARTUP: file executed on interactive startup (no default)
PYTHONPATH : ':'-separated list of directories prefixed to the
default module search path. The result is sys.path.
PYTHONHOME : alternate <prefix> directory (or <prefix>:<exec_prefix>).
The default module search path uses <prefix>/pythonX.X.
PYTHONCASEOK : ignore case in 'import' statements (Windows).