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Returns a Hash containing information about the GC.

The contents of the hash are implementation specific and may change in the future without notice.

The hash includes information about internal statistics about GC such as:

count

The total number of garbage collections ran since application start (count includes both minor and major garbage collections)

time

The total time spent in garbage collections (in milliseconds)

heap_allocated_pages

The total number of ‘:heap_eden_pages` + `:heap_tomb_pages`

heap_sorted_length

The number of pages that can fit into the buffer that holds references to all pages

heap_allocatable_pages

The total number of pages the application could allocate without additional GC

heap_available_slots

The total number of slots in all ‘:heap_allocated_pages`

heap_live_slots

The total number of slots which contain live objects

heap_free_slots

The total number of slots which do not contain live objects

heap_final_slots

The total number of slots with pending finalizers to be run

heap_marked_slots

The total number of objects marked in the last GC

heap_eden_pages

The total number of pages which contain at least one live slot

heap_tomb_pages

The total number of pages which do not contain any live slots

total_allocated_pages

The cumulative number of pages allocated since application start

total_freed_pages

The cumulative number of pages freed since application start

total_allocated_objects

The cumulative number of objects allocated since application start

total_freed_objects

The cumulative number of objects freed since application start

malloc_increase_bytes

Amount of memory allocated on the heap for objects. Decreased by any GC

malloc_increase_bytes_limit

When ‘:malloc_increase_bytes` crosses this limit, GC is triggered

minor_gc_count

The total number of minor garbage collections run since process start

major_gc_count

The total number of major garbage collections run since process start

compact_count

The total number of compactions run since process start

read_barrier_faults

The total number of times the read barrier was triggered during compaction

total_moved_objects

The total number of objects compaction has moved

remembered_wb_unprotected_objects

The total number of objects without write barriers

remembered_wb_unprotected_objects_limit

When ‘:remembered_wb_unprotected_objects` crosses this limit, major GC is triggered

old_objects

Number of live, old objects which have survived at least 3 garbage collections

old_objects_limit

When ‘:old_objects` crosses this limit, major GC is triggered

oldmalloc_increase_bytes

Amount of memory allocated on the heap for objects. Decreased by major GC

oldmalloc_increase_bytes_limit

When ‘:old_malloc_increase_bytes` crosses this limit, major GC is triggered

If the optional argument, hash, is given, it is overwritten and returned. This is intended to avoid probe effect.

This method is only expected to work on CRuby.

Returns true if the file at path new is newer than all the files at paths in array old_list; false otherwise.

Argument new and the elements of old_list should be interpretable as paths:

FileUtils.uptodate?('Rakefile', ['Gemfile', 'README.md']) # => true
FileUtils.uptodate?('Gemfile', ['Rakefile', 'README.md']) # => false

A non-existent file is considered to be infinitely old.

Related: FileUtils.touch.

Returns true if the file at path new is newer than all the files at paths in array old_list; false otherwise.

Argument new and the elements of old_list should be interpretable as paths:

FileUtils.uptodate?('Rakefile', ['Gemfile', 'README.md']) # => true
FileUtils.uptodate?('Gemfile', ['Rakefile', 'README.md']) # => false

A non-existent file is considered to be infinitely old.

Related: FileUtils.touch.

Changes permissions on the entries at the paths given in list (a single path or an array of paths) to the permissions given by mode; returns list if it is an array, [list] otherwise:

• Modifies each entry that is a regular file using File.chmod.

• Modifies each entry that is a symbolic link using File.lchmod.

Argument list or its elements should be interpretable as paths.

Argument mode may be either an integer or a string:

• Integer mode: represents the permission bits to be set:

  FileUtils.chmod(0755, 'src0.txt')
  FileUtils.chmod(0644, ['src0.txt', 'src0.dat'])
  

• String mode: represents the permissions to be set:

  The string is of the form [targets][[operator][perms[,perms]], where:

  • targets may be any combination of these letters:

    • 'u': permissions apply to the file’s owner.

    • 'g': permissions apply to users in the file’s group.

    • 'o': permissions apply to other users not in the file’s group.

    • 'a' (the default): permissions apply to all users.

  • operator may be one of these letters:

    • '+': adds permissions.

    • '-': removes permissions.

    • '=': sets (replaces) permissions.

  • perms (may be repeated, with separating commas) may be any combination of these letters:

    • 'r': Read.

    • 'w': Write.

    • 'x': Execute (search, for a directory).

    • 'X': Search (for a directories only; must be used with '+')

    • 's': Uid or gid.

    • 't': Sticky bit.

  Examples:

  FileUtils.chmod('u=wrx,go=rx', 'src1.txt')
  FileUtils.chmod('u=wrx,go=rx', '/usr/bin/ruby')
  

Keyword arguments:

• noop: true - does not change permissions; returns nil.

• verbose: true - prints an equivalent command:

  FileUtils.chmod(0755, 'src0.txt', noop: true, verbose: true)
  FileUtils.chmod(0644, ['src0.txt', 'src0.dat'], noop: true, verbose: true)
  FileUtils.chmod('u=wrx,go=rx', 'src1.txt', noop: true, verbose: true)
  FileUtils.chmod('u=wrx,go=rx', '/usr/bin/ruby', noop: true, verbose: true)
  

  Output:

  chmod 755 src0.txt
  chmod 644 src0.txt src0.dat
  chmod u=wrx,go=rx src1.txt
  chmod u=wrx,go=rx /usr/bin/ruby

Related: FileUtils.chmod_R.

Changes permissions on the entries at the paths given in list (a single path or an array of paths) to the permissions given by mode; returns list if it is an array, [list] otherwise:

• Modifies each entry that is a regular file using File.chmod.

• Modifies each entry that is a symbolic link using File.lchmod.

Argument list or its elements should be interpretable as paths.

Argument mode may be either an integer or a string:

• Integer mode: represents the permission bits to be set:

  FileUtils.chmod(0755, 'src0.txt')
  FileUtils.chmod(0644, ['src0.txt', 'src0.dat'])
  

• String mode: represents the permissions to be set:

  The string is of the form [targets][[operator][perms[,perms]], where:

  • targets may be any combination of these letters:

    • 'u': permissions apply to the file’s owner.

    • 'g': permissions apply to users in the file’s group.

    • 'o': permissions apply to other users not in the file’s group.

    • 'a' (the default): permissions apply to all users.

  • operator may be one of these letters:

    • '+': adds permissions.

    • '-': removes permissions.

    • '=': sets (replaces) permissions.

  • perms (may be repeated, with separating commas) may be any combination of these letters:

    • 'r': Read.

    • 'w': Write.

    • 'x': Execute (search, for a directory).

    • 'X': Search (for a directories only; must be used with '+')

    • 's': Uid or gid.

    • 't': Sticky bit.

  Examples:

  FileUtils.chmod('u=wrx,go=rx', 'src1.txt')
  FileUtils.chmod('u=wrx,go=rx', '/usr/bin/ruby')
  

Keyword arguments:

• noop: true - does not change permissions; returns nil.

• verbose: true - prints an equivalent command:

  FileUtils.chmod(0755, 'src0.txt', noop: true, verbose: true)
  FileUtils.chmod(0644, ['src0.txt', 'src0.dat'], noop: true, verbose: true)
  FileUtils.chmod('u=wrx,go=rx', 'src1.txt', noop: true, verbose: true)
  FileUtils.chmod('u=wrx,go=rx', '/usr/bin/ruby', noop: true, verbose: true)
  

  Output:

  chmod 755 src0.txt
  chmod 644 src0.txt src0.dat
  chmod u=wrx,go=rx src1.txt
  chmod u=wrx,go=rx /usr/bin/ruby

Related: FileUtils.chmod_R.

Like FileUtils.chmod, but changes permissions recursively.

Like FileUtils.chmod, but changes permissions recursively.

Changes the owner and group on the entries at the paths given in list (a single path or an array of paths) to the given user and group; returns list if it is an array, [list] otherwise:

• Modifies each entry that is a regular file using File.chown.

• Modifies each entry that is a symbolic link using File.lchown.

Argument list or its elements should be interpretable as paths.

User and group:

• Argument user may be a user name or a user id; if nil or -1, the user is not changed.

• Argument group may be a group name or a group id; if nil or -1, the group is not changed.

• The user must be a member of the group.

Examples:

# One path.
# User and group as string names.
File.stat('src0.txt').uid # => 1004
File.stat('src0.txt').gid # => 1004
FileUtils.chown('user2', 'group1', 'src0.txt')
File.stat('src0.txt').uid # => 1006
File.stat('src0.txt').gid # => 1005

# User and group as uid and gid.
FileUtils.chown(1004, 1004, 'src0.txt')
File.stat('src0.txt').uid # => 1004
File.stat('src0.txt').gid # => 1004

# Array of paths.
FileUtils.chown(1006, 1005, ['src0.txt', 'src0.dat'])

# Directory (not recursive).
FileUtils.chown('user2', 'group1', '.')

Keyword arguments:

• noop: true - does not change permissions; returns nil.

• verbose: true - prints an equivalent command:

  FileUtils.chown('user2', 'group1', 'src0.txt', noop: true, verbose: true)
  FileUtils.chown(1004, 1004, 'src0.txt', noop: true, verbose: true)
  FileUtils.chown(1006, 1005, ['src0.txt', 'src0.dat'], noop: true, verbose: true)
  FileUtils.chown('user2', 'group1', path, noop: true, verbose: true)
  FileUtils.chown('user2', 'group1', '.', noop: true, verbose: true)
  

  Output:

  chown user2:group1 src0.txt
  chown 1004:1004 src0.txt
  chown 1006:1005 src0.txt src0.dat
  chown user2:group1 src0.txt
  chown user2:group1 .

Related: FileUtils.chown_R.

Changes the owner and group on the entries at the paths given in list (a single path or an array of paths) to the given user and group; returns list if it is an array, [list] otherwise:

• Modifies each entry that is a regular file using File.chown.

• Modifies each entry that is a symbolic link using File.lchown.

Argument list or its elements should be interpretable as paths.

User and group:

• Argument user may be a user name or a user id; if nil or -1, the user is not changed.

• Argument group may be a group name or a group id; if nil or -1, the group is not changed.

• The user must be a member of the group.

Examples:

# One path.
# User and group as string names.
File.stat('src0.txt').uid # => 1004
File.stat('src0.txt').gid # => 1004
FileUtils.chown('user2', 'group1', 'src0.txt')
File.stat('src0.txt').uid # => 1006
File.stat('src0.txt').gid # => 1005

# User and group as uid and gid.
FileUtils.chown(1004, 1004, 'src0.txt')
File.stat('src0.txt').uid # => 1004
File.stat('src0.txt').gid # => 1004

# Array of paths.
FileUtils.chown(1006, 1005, ['src0.txt', 'src0.dat'])

# Directory (not recursive).
FileUtils.chown('user2', 'group1', '.')

Keyword arguments:

• noop: true - does not change permissions; returns nil.

• verbose: true - prints an equivalent command:

  FileUtils.chown('user2', 'group1', 'src0.txt', noop: true, verbose: true)
  FileUtils.chown(1004, 1004, 'src0.txt', noop: true, verbose: true)
  FileUtils.chown(1006, 1005, ['src0.txt', 'src0.dat'], noop: true, verbose: true)
  FileUtils.chown('user2', 'group1', path, noop: true, verbose: true)
  FileUtils.chown('user2', 'group1', '.', noop: true, verbose: true)
  

  Output:

  chown user2:group1 src0.txt
  chown 1004:1004 src0.txt
  chown 1006:1005 src0.txt src0.dat
  chown user2:group1 src0.txt
  chown user2:group1 .

Related: FileUtils.chown_R.

Like FileUtils.chown, but changes owner and group recursively.

Like FileUtils.chown, but changes owner and group recursively.

Updates modification times (mtime) and access times (atime) of the entries given by the paths in list (a single path or an array of paths); returns list if it is an array, [list] otherwise.

By default, creates an empty file for any path to a non-existent entry; use keyword argument nocreate to raise an exception instead.

Argument list or its elements should be interpretable as paths.

Examples:

# Single path.
f = File.new('src0.txt') # Existing file.
f.atime # => 2022-06-10 11:11:21.200277 -0700
f.mtime # => 2022-06-10 11:11:21.200277 -0700
FileUtils.touch('src0.txt')
f = File.new('src0.txt')
f.atime # => 2022-06-11 08:28:09.8185343 -0700
f.mtime # => 2022-06-11 08:28:09.8185343 -0700

# Array of paths.
FileUtils.touch(['src0.txt', 'src0.dat'])

Keyword arguments:

• mtime: time - sets the entry’s mtime to the given time, instead of the current time.

• nocreate: true - raises an exception if the entry does not exist.

• noop: true - does not touch entries; returns nil.

• verbose: true - prints an equivalent command:

  FileUtils.touch('src0.txt', noop: true, verbose: true)
  FileUtils.touch(['src0.txt', 'src0.dat'], noop: true, verbose: true)
  FileUtils.touch(path, noop: true, verbose: true)
  

  Output:

  touch src0.txt
  touch src0.txt src0.dat
  touch src0.txt
  

Related: FileUtils.uptodate?.

Updates modification times (mtime) and access times (atime) of the entries given by the paths in list (a single path or an array of paths); returns list if it is an array, [list] otherwise.

By default, creates an empty file for any path to a non-existent entry; use keyword argument nocreate to raise an exception instead.

Argument list or its elements should be interpretable as paths.

Examples:

# Single path.
f = File.new('src0.txt') # Existing file.
f.atime # => 2022-06-10 11:11:21.200277 -0700
f.mtime # => 2022-06-10 11:11:21.200277 -0700
FileUtils.touch('src0.txt')
f = File.new('src0.txt')
f.atime # => 2022-06-11 08:28:09.8185343 -0700
f.mtime # => 2022-06-11 08:28:09.8185343 -0700

# Array of paths.
FileUtils.touch(['src0.txt', 'src0.dat'])

Keyword arguments:

• mtime: time - sets the entry’s mtime to the given time, instead of the current time.

• nocreate: true - raises an exception if the entry does not exist.

• noop: true - does not touch entries; returns nil.

• verbose: true - prints an equivalent command:

  FileUtils.touch('src0.txt', noop: true, verbose: true)
  FileUtils.touch(['src0.txt', 'src0.dat'], noop: true, verbose: true)
  FileUtils.touch(path, noop: true, verbose: true)
  

  Output:

  touch src0.txt
  touch src0.txt src0.dat
  touch src0.txt
  

Related: FileUtils.uptodate?.

Returns an array of the string names of FileUtils methods that accept one or more keyword arguments:

FileUtils.commands.sort.take(3) # => ["cd", "chdir", "chmod"]

Set the changed state of this object. Notifications will be sent only if the changed state is true.

state

Boolean indicating the changed state of this Observable.

Returns true if this object’s state has been changed since the last notify_observers call.