Enables coverage measurement.
Convert self to locale encoding
Convert self to locale encoding
Returns self, for backward compatibility.
Returns true if the named file is writable by the effective user and group id of this process. See eaccess(3).
Note that some OS-level security features may cause this to return true even though the file is not writable by the effective user/group.
Returns true if the named file is executable by the effective user and group id of this process. See eaccess(3).
Windows does not support execute permissions separately from read permissions. On Windows, a file is only considered executable if it ends in .bat, .cmd, .com, or .exe.
Note that some OS-level security features may cause this to return true even though the file is not executable by the effective user/group.
Returns true if the named files are identical.
file_1 and file_2 can be an IO object.
open("a", "w") {} p File.identical?("a", "a") #=> true p File.identical?("a", "./a") #=> true File.link("a", "b") p File.identical?("a", "b") #=> true File.symlink("a", "c") p File.identical?("a", "c") #=> true open("d", "w") {} p File.identical?("a", "d") #=> false
Initiates garbage collection, even if manually disabled.
This method is defined with keyword arguments that default to true:
def GC.start(full_mark: true, immediate_sweep: true); end
Use full_mark: false to perform a minor GC. Use immediate_sweep: false to defer sweeping (use lazy sweep).
Note: These keyword arguments are implementation and version dependent. They are not guaranteed to be future-compatible, and may be ignored if the underlying implementation does not support them.
Returns a Hash containing information about the GC.
The hash includes information about internal statistics about GC such as:
{
:count=>0,
:heap_allocated_pages=>24,
:heap_sorted_length=>24,
:heap_allocatable_pages=>0,
:heap_available_slots=>9783,
:heap_live_slots=>7713,
:heap_free_slots=>2070,
:heap_final_slots=>0,
:heap_marked_slots=>0,
:heap_eden_pages=>24,
:heap_tomb_pages=>0,
:total_allocated_pages=>24,
:total_freed_pages=>0,
:total_allocated_objects=>7796,
:total_freed_objects=>83,
:malloc_increase_bytes=>2389312,
:malloc_increase_bytes_limit=>16777216,
:minor_gc_count=>0,
:major_gc_count=>0,
:remembered_wb_unprotected_objects=>0,
:remembered_wb_unprotected_objects_limit=>0,
:old_objects=>0,
:old_objects_limit=>0,
:oldmalloc_increase_bytes=>2389760,
:oldmalloc_increase_bytes_limit=>16777216
}
The contents of the hash are implementation specific and may be changed in the future.
This method is only expected to work on C Ruby.
Returns the elapsed real time used to execute the given block.
Returns the elapsed real time used to execute the given block.
The path to the data directory specified by the gem name. If the package is not available as a gem, return nil.
Splits a string into an array of tokens in the same way the UNIX Bourne shell does.
argv = Shellwords.split('here are "two words"') argv #=> ["here", "are", "two words"]
Note, however, that this is not a command line parser. Shell metacharacters except for the single and double quotes and backslash are not treated as such.
argv = Shellwords.split('ruby my_prog.rb | less') argv #=> ["ruby", "my_prog.rb", "|", "less"]
String#shellsplit is a shortcut for this function.
argv = 'here are "two words"'.shellsplit argv #=> ["here", "are", "two words"]
Splits a string into an array of tokens in the same way the UNIX Bourne shell does.
argv = Shellwords.split('here are "two words"') argv #=> ["here", "are", "two words"]
Note, however, that this is not a command line parser. Shell metacharacters except for the single and double quotes and backslash are not treated as such.
argv = Shellwords.split('ruby my_prog.rb | less') argv #=> ["ruby", "my_prog.rb", "|", "less"]
String#shellsplit is a shortcut for this function.
argv = 'here are "two words"'.shellsplit argv #=> ["here", "are", "two words"]
Escapes a string so that it can be safely used in a Bourne shell command line. str can be a non-string object that responds to to_s.
Note that a resulted string should be used unquoted and is not intended for use in double quotes nor in single quotes.
argv = Shellwords.escape("It's better to give than to receive") argv #=> "It\\'s\\ better\\ to\\ give\\ than\\ to\\ receive"
String#shellescape is a shorthand for this function.
argv = "It's better to give than to receive".shellescape argv #=> "It\\'s\\ better\\ to\\ give\\ than\\ to\\ receive" # Search files in lib for method definitions pattern = "^[ \t]*def " open("| grep -Ern #{pattern.shellescape} lib") { |grep| grep.each_line { |line| file, lineno, matched_line = line.split(':', 3) # ... } }
It is the caller’s responsibility to encode the string in the right encoding for the shell environment where this string is used.
Multibyte characters are treated as multibyte characters, not as bytes.
Returns an empty quoted String if str has a length of zero.
Escapes a string so that it can be safely used in a Bourne shell command line. str can be a non-string object that responds to to_s.
Note that a resulted string should be used unquoted and is not intended for use in double quotes nor in single quotes.
argv = Shellwords.escape("It's better to give than to receive") argv #=> "It\\'s\\ better\\ to\\ give\\ than\\ to\\ receive"
String#shellescape is a shorthand for this function.
argv = "It's better to give than to receive".shellescape argv #=> "It\\'s\\ better\\ to\\ give\\ than\\ to\\ receive" # Search files in lib for method definitions pattern = "^[ \t]*def " open("| grep -Ern #{pattern.shellescape} lib") { |grep| grep.each_line { |line| file, lineno, matched_line = line.split(':', 3) # ... } }
It is the caller’s responsibility to encode the string in the right encoding for the shell environment where this string is used.
Multibyte characters are treated as multibyte characters, not as bytes.
Returns an empty quoted String if str has a length of zero.
Builds a command line string from an argument list, array.
All elements are joined into a single string with fields separated by a space, where each element is escaped for the Bourne shell and stringified using to_s.
ary = ["There's", "a", "time", "and", "place", "for", "everything"] argv = Shellwords.join(ary) argv #=> "There\\'s a time and place for everything"
Array#shelljoin is a shortcut for this function.
ary = ["Don't", "rock", "the", "boat"] argv = ary.shelljoin argv #=> "Don\\'t rock the boat"
You can also mix non-string objects in the elements as allowed in Array#join.
output = `#{['ps', '-p', $$].shelljoin}`
Builds a command line string from an argument list, array.
All elements are joined into a single string with fields separated by a space, where each element is escaped for the Bourne shell and stringified using to_s.
ary = ["There's", "a", "time", "and", "place", "for", "everything"] argv = Shellwords.join(ary) argv #=> "There\\'s a time and place for everything"
Array#shelljoin is a shortcut for this function.
ary = ["Don't", "rock", "the", "boat"] argv = ary.shelljoin argv #=> "Don\\'t rock the boat"
You can also mix non-string objects in the elements as allowed in Array#join.
output = `#{['ps', '-p', $$].shelljoin}`
Returns the singleton instance.
Computes the arc tangent given y and x. Returns a Float in the range -PI..PI. Return value is a angle in radians between the positive x-axis of cartesian plane and the point given by the coordinates (x, y) on it.
Domain: (-INFINITY, INFINITY)
Codomain: [-PI, PI]
Math.atan2(-0.0, -1.0) #=> -3.141592653589793 Math.atan2(-1.0, -1.0) #=> -2.356194490192345 Math.atan2(-1.0, 0.0) #=> -1.5707963267948966 Math.atan2(-1.0, 1.0) #=> -0.7853981633974483 Math.atan2(-0.0, 1.0) #=> -0.0 Math.atan2(0.0, 1.0) #=> 0.0 Math.atan2(1.0, 1.0) #=> 0.7853981633974483 Math.atan2(1.0, 0.0) #=> 1.5707963267948966 Math.atan2(1.0, -1.0) #=> 2.356194490192345 Math.atan2(0.0, -1.0) #=> 3.141592653589793 Math.atan2(INFINITY, INFINITY) #=> 0.7853981633974483 Math.atan2(INFINITY, -INFINITY) #=> 2.356194490192345 Math.atan2(-INFINITY, INFINITY) #=> -0.7853981633974483 Math.atan2(-INFINITY, -INFINITY) #=> -2.356194490192345
Computes the tangent of x (expressed in radians).
Domain: (-INFINITY, INFINITY)
Codomain: (-INFINITY, INFINITY)
Math.tan(0) #=> 0.0