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jruby — Interpreted object-oriented scripting language


jruby [--copyright] [--version] [-Sacdlnpswvy] [-0[octal]] [-C directory] [-F pattern]
[-I directory] [-K c] [-T[level]] [-e command] [-i[extension]] [-r library]
[-x[directory]] [--] [program_file] [argument ...]


Jruby is a 100% pure-Java implementation of Ruby, an interpreted scripting language for
quick and easy object-oriented programming. It has many features to process text files and
to do system management tasks (as in Perl). It is simple, straight-forward, and extensible.


Ruby interpreter accepts following command-line options (switches). They are quite similar
to those of perl(1).

--copyright Prints the copyright notice.

--version Prints the version of Ruby interpreter.

-0[octal] (The digit “zero”.) Specifies the input record separator ($/) as an octal
number. If no digit is given, the null character is taken as the separator.
Other switches may follow the digits. -00 turns Ruby into paragraph mode.
-0777 makes Ruby read whole file at once as a single string since there is no
legal character with that value.

-C directory Causes Ruby to switch to the directory.

-F pattern Specifies input field separator ($;).

-I directory Used to tell Ruby where to load the library scripts. Directory path will be
added to the load-path variable ($:).

-K kcode Specifies KANJI (Japanese) encoding.

-S Makes Ruby use the PATH environment variable to search for script, unless if
its name begins with a slash. This is used to emulate #! on machines that
don't support it, in the following manner:

#! /usr/local/bin/ruby
# This line makes the next one a comment in Ruby \
exec /usr/local/bin/ruby -S $0 $*

-T[level] Turns on taint checks at the specified level (default 1).

-a Turns on auto-split mode when used with -n or -p. In auto-split mode, Ruby
$F = $_.split
at beginning of each loop.

-c Causes Ruby to check the syntax of the script and exit without executing. If
there are no syntax errors, Ruby will print “Syntax OK” to the standard

--debug Turns on debug mode. $DEBUG will be set to true.

-e command Specifies script from command-line while telling Ruby not to search the rest
of arguments for a script file name.

--help Prints a summary of the options.

-i extension Specifies in-place-edit mode. The extension, if specified, is added to old
file name to make a backup copy. For example:

% echo matz > /tmp/junk
% cat /tmp/junk
% ruby -p -i.bak -e '$_.upcase!' /tmp/junk
% cat /tmp/junk
% cat /tmp/junk.bak

-l (The lowercase letter “ell”.) Enables automatic line-ending processing,
which means to firstly set $\ to the value of $/, and secondly chops every
line read using chop!.

-n Causes Ruby to assume the following loop around your script, which makes it
iterate over file name arguments somewhat like sed -n or awk.

while gets

-p Acts mostly same as -n switch, but print the value of variable $_ at the each
end of the loop. For example:

% echo matz | ruby -p -e '$_.tr! "a-z", "A-Z"'

-r library Causes Ruby to load the library using require. It is useful when using -n or

-s Enables some switch parsing for switches after script name but before any
file name arguments (or before a --). Any switches found there are removed
from ARGV and set the corresponding variable in the script. For example:

#! /usr/local/bin/ruby -s
# prints "true" if invoked with `-xyz' switch.
print "true\n" if $xyz

On some systems $0 does not always contain the full pathname, so you need the
-S switch to tell Ruby to search for the script if necessary. To handle
embedded spaces or such. A better construct than $* would be ${1+"$@"}, but
it does not work if the script is being interpreted by csh(1).

--verbose Enables verbose mode. Ruby will print its version at the beginning, and set
the variable $VERBOSE to true. Some methods print extra messages if this
variable is true. If this switch is given, and no other switches are
present, Ruby quits after printing its version.

-w Enables verbose mode without printing version message at the beginning. It
sets the $VERBOSE variable to true.

-x[directory] Tells Ruby that the script is embedded in a message. Leading garbage will be
discarded until the first that starts with “#!” and contains the string,
“ruby”. Any meaningful switches on that line will applied. The end of
script must be specified with either EOF, ^D (control-D), ^Z (control-Z), or
reserved word __END__. If the directory name is specified, Ruby will switch
to that directory before executing script.

--yydebug Turns on compiler debug mode. Ruby will print a bunch of internal state
messages during compiling scripts. You don't have to specify this switch,
unless you are going to debug the Ruby interpreter.

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