Returns true if the named file exists and has a zero size.
file_name can be an IO object.
Given a set of strings, calculate the set of unambiguous abbreviations for those strings, and return a hash where the keys are all the possible abbreviations and the values are the full strings.
Thus, given words is “car” and “cone”, the keys pointing to “car” would be “ca” and “car”, while those pointing to “cone” would be “co”, “con”, and “cone”.
require 'abbrev' Abbrev.abbrev(%w{ car cone }) #=> {"ca"=>"car", "con"=>"cone", "co"=>"cone", "car"=>"car", "cone"=>"cone"}
The optional pattern parameter is a pattern or a string. Only input strings that match the pattern or start with the string are included in the output hash.
Abbrev.abbrev(%w{car box cone crab}, /b/) #=> {"box"=>"box", "bo"=>"box", "b"=>"box", "crab" => "crab"} Abbrev.abbrev(%w{car box cone}, 'ca') #=> {"car"=>"car", "ca"=>"car"}
Given a set of strings, calculate the set of unambiguous abbreviations for those strings, and return a hash where the keys are all the possible abbreviations and the values are the full strings.
Thus, given words is “car” and “cone”, the keys pointing to “car” would be “ca” and “car”, while those pointing to “cone” would be “co”, “con”, and “cone”.
require 'abbrev' Abbrev.abbrev(%w{ car cone }) #=> {"ca"=>"car", "con"=>"cone", "co"=>"cone", "car"=>"car", "cone"=>"cone"}
The optional pattern parameter is a pattern or a string. Only input strings that match the pattern or start with the string are included in the output hash.
Abbrev.abbrev(%w{car box cone crab}, /b/) #=> {"box"=>"box", "bo"=>"box", "b"=>"box", "crab" => "crab"} Abbrev.abbrev(%w{car box cone}, 'ca') #=> {"car"=>"car", "ca"=>"car"}
Returns the time used to execute the given block as a Benchmark::Tms object. Takes label option.
require 'benchmark' n = 1000000 time = Benchmark.measure do n.times { a = "1" } end puts time
Generates:
0.220000 0.000000 0.220000 ( 0.227313)
Returns the elapsed real time used to execute the given block.
Returns the time used to execute the given block as a Benchmark::Tms object. Takes label option.
require 'benchmark' n = 1000000 time = Benchmark.measure do n.times { a = "1" } end puts time
Generates:
0.220000 0.000000 0.220000 ( 0.227313)
Returns the elapsed real time used to execute the given block.
The directory prefix this RubyGems was installed at. If your prefix is in a standard location (ie, rubygems is installed where you’d expect it to be), then prefix returns nil.
Is uri the URI for the current local server?
Get the thread of the primary server.
This returns nil if there is no primary server. See primary_server.
Get the thread of the primary server.
This returns nil if there is no primary server. See primary_server.
Changes permission bits on the named files (in list) to the bit pattern represented by mode.
mode is the symbolic and absolute mode can be used.
Absolute mode is
FileUtils.chmod 0755, 'somecommand' FileUtils.chmod 0644, %w(my.rb your.rb his.rb her.rb) FileUtils.chmod 0755, '/usr/bin/ruby', verbose: true
Symbolic mode is
FileUtils.chmod "u=wrx,go=rx", 'somecommand' FileUtils.chmod "u=wr,go=rr", %w(my.rb your.rb his.rb her.rb) FileUtils.chmod "u=wrx,go=rx", '/usr/bin/ruby', verbose: true
is user, group, other mask.
is user’s mask.
is group’s mask.
is other’s mask.
is write permission.
is read permission.
is execute permission.
is execute permission for directories only, must be used in conjunction with “+”
is uid, gid.
is sticky bit.
is added to a class given the specified mode.
Is removed from a given class given mode.
Is the exact nature of the class will be given a specified mode.
Changes permission bits on the named files (in list) to the bit pattern represented by mode.
mode is the symbolic and absolute mode can be used.
Absolute mode is
FileUtils.chmod 0755, 'somecommand' FileUtils.chmod 0644, %w(my.rb your.rb his.rb her.rb) FileUtils.chmod 0755, '/usr/bin/ruby', verbose: true
Symbolic mode is
FileUtils.chmod "u=wrx,go=rx", 'somecommand' FileUtils.chmod "u=wr,go=rr", %w(my.rb your.rb his.rb her.rb) FileUtils.chmod "u=wrx,go=rx", '/usr/bin/ruby', verbose: true
is user, group, other mask.
is user’s mask.
is group’s mask.
is other’s mask.
is write permission.
is read permission.
is execute permission.
is execute permission for directories only, must be used in conjunction with “+”
is uid, gid.
is sticky bit.
is added to a class given the specified mode.
Is removed from a given class given mode.
Is the exact nature of the class will be given a specified mode.
Changes permission bits on the named files (in list) to the bit pattern represented by mode.
FileUtils.chmod_R 0700, "/tmp/app.#{$$}" FileUtils.chmod_R "u=wrx", "/tmp/app.#{$$}"
Changes permission bits on the named files (in list) to the bit pattern represented by mode.
FileUtils.chmod_R 0700, "/tmp/app.#{$$}" FileUtils.chmod_R "u=wrx", "/tmp/app.#{$$}"
URI::regexp([match_schemes])
match_schemes
Array of schemes. If given, resulting regexp matches to URIs whose scheme is one of the match_schemes.
Returns a Regexp object which matches to URI-like strings. The Regexp object returned by this method includes arbitrary number of capture group (parentheses). Never rely on it’s number.
require 'uri' # extract first URI from html_string html_string.slice(URI.regexp) # remove ftp URIs html_string.sub(URI.regexp(['ftp']), '') # You should not rely on the number of parentheses html_string.scan(URI.regexp) do |*matches| p $& end
Open3.capture3 captures the standard output and the standard error of a command.
stdout_str, stderr_str, status = Open3.capture3([env,] cmd... [, opts])
The arguments env, cmd and opts are passed to Open3.popen3 except opts[:stdin_data] and opts[:binmode]. See Process.spawn.
If opts[:stdin_data] is specified, it is sent to the command’s standard input.
If opts[:binmode] is true, internal pipes are set to binary mode.
Examples:
# dot is a command of graphviz. graph = <<'End' digraph g { a -> b } End drawn_graph, dot_log = Open3.capture3("dot -v", :stdin_data=>graph) o, e, s = Open3.capture3("echo abc; sort >&2", :stdin_data=>"foo\nbar\nbaz\n") p o #=> "abc\n" p e #=> "bar\nbaz\nfoo\n" p s #=> #<Process::Status: pid 32682 exit 0> # generate a thumbnail image using the convert command of ImageMagick. # However, if the image is really stored in a file, # system("convert", "-thumbnail", "80", "png:#{filename}", "png:-") is better # because of reduced memory consumption. # But if the image is stored in a DB or generated by the gnuplot Open3.capture2 example, # Open3.capture3 should be considered. # image = File.read("/usr/share/openclipart/png/animals/mammals/sheep-md-v0.1.png", :binmode=>true) thumbnail, err, s = Open3.capture3("convert -thumbnail 80 png:- png:-", :stdin_data=>image, :binmode=>true) if s.success? STDOUT.binmode; print thumbnail end
Open3.capture3 captures the standard output and the standard error of a command.
stdout_str, stderr_str, status = Open3.capture3([env,] cmd... [, opts])
The arguments env, cmd and opts are passed to Open3.popen3 except opts[:stdin_data] and opts[:binmode]. See Process.spawn.
If opts[:stdin_data] is specified, it is sent to the command’s standard input.
If opts[:binmode] is true, internal pipes are set to binary mode.
Examples:
# dot is a command of graphviz. graph = <<'End' digraph g { a -> b } End drawn_graph, dot_log = Open3.capture3("dot -v", :stdin_data=>graph) o, e, s = Open3.capture3("echo abc; sort >&2", :stdin_data=>"foo\nbar\nbaz\n") p o #=> "abc\n" p e #=> "bar\nbaz\nfoo\n" p s #=> #<Process::Status: pid 32682 exit 0> # generate a thumbnail image using the convert command of ImageMagick. # However, if the image is really stored in a file, # system("convert", "-thumbnail", "80", "png:#{filename}", "png:-") is better # because of reduced memory consumption. # But if the image is stored in a DB or generated by the gnuplot Open3.capture2 example, # Open3.capture3 should be considered. # image = File.read("/usr/share/openclipart/png/animals/mammals/sheep-md-v0.1.png", :binmode=>true) thumbnail, err, s = Open3.capture3("convert -thumbnail 80 png:- png:-", :stdin_data=>image, :binmode=>true) if s.success? STDOUT.binmode; print thumbnail end
Open3.capture2 captures the standard output of a command.
stdout_str, status = Open3.capture2([env,] cmd... [, opts])
The arguments env, cmd and opts are passed to Open3.popen3 except opts[:stdin_data] and opts[:binmode]. See Process.spawn.
If opts[:stdin_data] is specified, it is sent to the command’s standard input.
If opts[:binmode] is true, internal pipes are set to binary mode.
Example:
# factor is a command for integer factorization. o, s = Open3.capture2("factor", :stdin_data=>"42") p o #=> "42: 2 3 7\n" # generate x**2 graph in png using gnuplot. gnuplot_commands = <<"End" set terminal png plot x**2, "-" with lines 1 14 2 1 3 8 4 5 e End image, s = Open3.capture2("gnuplot", :stdin_data=>gnuplot_commands, :binmode=>true)
Open3.capture2 captures the standard output of a command.
stdout_str, status = Open3.capture2([env,] cmd... [, opts])
The arguments env, cmd and opts are passed to Open3.popen3 except opts[:stdin_data] and opts[:binmode]. See Process.spawn.
If opts[:stdin_data] is specified, it is sent to the command’s standard input.
If opts[:binmode] is true, internal pipes are set to binary mode.
Example:
# factor is a command for integer factorization. o, s = Open3.capture2("factor", :stdin_data=>"42") p o #=> "42: 2 3 7\n" # generate x**2 graph in png using gnuplot. gnuplot_commands = <<"End" set terminal png plot x**2, "-" with lines 1 14 2 1 3 8 4 5 e End image, s = Open3.capture2("gnuplot", :stdin_data=>gnuplot_commands, :binmode=>true)
Open3.capture2e captures the standard output and the standard error of a command.
stdout_and_stderr_str, status = Open3.capture2e([env,] cmd... [, opts])
The arguments env, cmd and opts are passed to Open3.popen3 except opts[:stdin_data] and opts[:binmode]. See Process.spawn.
If opts[:stdin_data] is specified, it is sent to the command’s standard input.
If opts[:binmode] is true, internal pipes are set to binary mode.
Example:
# capture make log make_log, s = Open3.capture2e("make")
Open3.capture2e captures the standard output and the standard error of a command.
stdout_and_stderr_str, status = Open3.capture2e([env,] cmd... [, opts])
The arguments env, cmd and opts are passed to Open3.popen3 except opts[:stdin_data] and opts[:binmode]. See Process.spawn.
If opts[:stdin_data] is specified, it is sent to the command’s standard input.
If opts[:binmode] is true, internal pipes are set to binary mode.
Example:
# capture make log make_log, s = Open3.capture2e("make")