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Class: ENV

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ::Enumerable
Inherits: Object
Defined in: hash.c,
hash.c

Overview

ENV is a hash-like accessor for environment variables.

Class Attribute Summary

Class Method Summary

::Enumerable - Extended

all?

Passes each element of the collection to the given block.

any?

Passes each element of the collection to the given block.

chain

Returns an enumerator object generated from this enumerator and given enumerables.

chunk

Enumerates over the items, chunking them together based on the return value of the block.

chunk_while

Creates an enumerator for each chunked elements.

collect

Alias for Enumerable#map.

collect_concat
count

Returns the number of items in enum through enumeration.

cycle

Calls block for each element of enum repeatedly n times or forever if none or nil is given.

detect

Alias for Enumerable#find.

drop

Drops first n elements from enum, and returns rest elements in an array.

drop_while

Drops elements up to, but not including, the first element for which the block returns nil or false and returns an array containing the remaining elements.

each_cons

Iterates the given block for each array of consecutive <n> elements.

each_entry

Calls block once for each element in self, passing that element as a parameter, converting multiple values from yield to an array.

each_slice

Iterates the given block for each slice of <n> elements.

each_with_index

Calls block with two arguments, the item and its index, for each item in enum.

each_with_object

Iterates the given block for each element with an arbitrary object given, and returns the initially given object.

entries

Alias for Enumerable#to_a.

filter

Returns an array containing all elements of enum for which the given block returns a true value.

filter_map

Returns a new array containing the truthy results (everything except false or nil) of running the block for every element in enum.

find

Passes each entry in enum to block.

find_all
find_index

Compares each entry in enum with value or passes to block.

first

Returns the first element, or the first n elements, of the enumerable.

flat_map

Returns a new array with the concatenated results of running block once for every element in enum.

grep

Returns an array of every element in enum for which Pattern === element.

grep_v

Inverted version of Enumerable#grep.

group_by

Groups the collection by result of the block.

include?
inject

Combines all elements of enum by applying a binary operation, specified by a block or a symbol that names a method or operator.

lazy

Returns an ::Enumerator::Lazy, which redefines most ::Enumerable methods to postpone enumeration and enumerate values only on an as-needed basis.

map

Returns a new array with the results of running block once for every element in enum.

max

Returns the object in enum with the maximum value.

max_by

Returns the object in enum that gives the maximum value from the given block.

member?

Returns true if any member of enum equals obj.

min

Returns the object in enum with the minimum value.

min_by

Returns the object in enum that gives the minimum value from the given block.

minmax

Returns a two element array which contains the minimum and the maximum value in the enumerable.

minmax_by

Returns a two element array containing the objects in enum that correspond to the minimum and maximum values respectively from the given block.

none?

Passes each element of the collection to the given block.

one?

Passes each element of the collection to the given block.

partition

Returns two arrays, the first containing the elements of enum for which the block evaluates to true, the second containing the rest.

reduce
reject

Returns an array for all elements of enum for which the given block returns false.

reverse_each

Builds a temporary array and traverses that array in reverse order.

select
slice_after

Creates an enumerator for each chunked elements.

slice_before

Creates an enumerator for each chunked elements.

slice_when

Creates an enumerator for each chunked elements.

sort

Returns an array containing the items in enum sorted.

sort_by

Sorts enum using a set of keys generated by mapping the values in enum through the given block.

sum

Returns the sum of elements in an ::Enumerable.

take

Returns first n elements from enum.

take_while

Passes elements to the block until the block returns nil or false, then stops iterating and returns an array of all prior elements.

tally

Tallys the collection.

to_a

Returns an array containing the items in enum.

to_h

Returns the result of interpreting enum as a list of [key, value] pairs.

uniq

Returns a new array by removing duplicate values in self.

zip

Takes one element from enum and merges corresponding elements from each args.

Class Attribute Details

.empty?Boolean (readonly)

Returns true when there are no environment variables

[ GitHub ]

  
# File 'hash.c', line 5595

static VALUE
env_empty_p(void)
{
    char **env;

    env = GET_ENVIRON(environ);
    if (env[0] == 0) {
	FREE_ENVIRON(environ);
	return Qtrue;
    }
    FREE_ENVIRON(environ);
    return Qfalse;
}

Class Method Details

.[](name) ⇒ value

Retrieves the value for environment variable name as a ::String. Returns nil if the named variable does not exist.

[ GitHub ]

  
# File 'hash.c', line 4751

static VALUE
rb_f_getenv(VALUE obj, VALUE name)
{
    const char *nam, *env;

    nam = env_name(name);
    env = getenv(nam);
    if (env) {
	return env_name_new(nam, env);
    }
    return Qnil;
}

.[]=(name, value) .store(name, value) ⇒ value
Also known as: .store

Sets the environment variable name to value. If the value given is nil the environment variable is deleted. name must be a string.

[ GitHub ]

  
# File 'hash.c', line 5069

static VALUE
env_aset_m(VALUE obj, VALUE nm, VALUE val)
{
    return env_aset(nm, val);
}

.assoc(name) ⇒ Array?

Returns an ::Array of the name and value of the environment variable with name or nil if the name cannot be found.

[ GitHub ]

  
# File 'hash.c', line 5635

static VALUE
env_assoc(VALUE env, VALUE key)
{
    const char *s, *e;

    s = env_name(key);
    e = getenv(s);
    if (e) return rb_assoc_new(key, env_str_new2(e));
    return Qnil;
}

.clear

Removes every environment variable.

[ GitHub ]

  
# File 'hash.c', line 5462

VALUE
rb_env_clear(void)
{
    VALUE keys;
    long i;

    keys = env_keys();
    for (i=0; i<RARRAY_LEN(keys); i++) {
	VALUE val = rb_f_getenv(Qnil, RARRAY_AREF(keys, i));
	if (!NIL_P(val)) {
            env_delete(RARRAY_AREF(keys, i));
	}
    }
    RB_GC_GUARD(keys);
    return envtbl;
}

.delete(name) ⇒ value .delete(name) {|name| ... } ⇒ value

Deletes the environment variable with name and returns the value of the variable. If a block is given it will be called when the named environment does not exist.

[ GitHub ]

  
# File 'hash.c', line 4734

static VALUE
env_delete_m(VALUE obj, VALUE name)
{
    VALUE val;

    val = env_delete(name);
    if (NIL_P(val) && rb_block_given_p()) rb_yield(name);
    return val;
}

.delete_if {|name, value| ... } ⇒ Hash .delete_ifEnumerator

Deletes every environment variable for which the block evaluates to true.

If no block is given an enumerator is returned instead.

[ GitHub ]

  
# File 'hash.c', line 5309

static VALUE
env_delete_if(VALUE ehash)
{
    RETURN_SIZED_ENUMERATOR(ehash, 0, 0, rb_env_size);
    env_reject_bang(ehash);
    return envtbl;
}

.each {|name, value| ... } ⇒ Hash .eachEnumerator .each_pair {|name, value| ... } ⇒ Hash .each_pairEnumerator
Also known as: .each_pair

Yields each environment variable name and value.

If no block is given an ::Enumerator is returned.

[ GitHub ]

  
# File 'hash.c', line 5232

static VALUE
env_each_pair(VALUE ehash)
{
    char **env;
    VALUE ary;
    long i;

    RETURN_SIZED_ENUMERATOR(ehash, 0, 0, rb_env_size);

    ary = rb_ary_new();
    env = GET_ENVIRON(environ);
    while (*env) {
	char *s = strchr(*env, '=');
	if (s) {
	    rb_ary_push(ary, env_str_new(*env, s-*env));
	    rb_ary_push(ary, env_str_new2(s+1));
	}
	env++;
    }
    FREE_ENVIRON(environ);

    if (rb_block_arity() > 1) {
	for (i=0; i<RARRAY_LEN(ary); i+=2) {
	    rb_yield_values(2, RARRAY_AREF(ary, i), RARRAY_AREF(ary, i+1));
	}
    }
    else {
	for (i=0; i<RARRAY_LEN(ary); i+=2) {
	    rb_yield(rb_assoc_new(RARRAY_AREF(ary, i), RARRAY_AREF(ary, i+1)));
	}
    }
    return ehash;
}

.each_key {|name| ... } ⇒ Hash .each_keyEnumerator

Yields each environment variable name.

An Enumerator is returned if no block is given.

[ GitHub ]

  
# File 'hash.c', line 5159

static VALUE
env_each_key(VALUE ehash)
{
    VALUE keys;
    long i;

    RETURN_SIZED_ENUMERATOR(ehash, 0, 0, rb_env_size);
    keys = env_keys();
    for (i=0; i<RARRAY_LEN(keys); i++) {
	rb_yield(RARRAY_AREF(keys, i));
    }
    return ehash;
}

.each {|name, value| ... } ⇒ Hash .eachEnumerator .each_pair {|name, value| ... } ⇒ Hash .each_pairEnumerator

Alias for .each.

.each_value {|value| ... } ⇒ Hash .each_valueEnumerator

Yields each environment variable value.

An Enumerator is returned if no block was given.

[ GitHub ]

  
# File 'hash.c', line 5207

static VALUE
env_each_value(VALUE ehash)
{
    VALUE values;
    long i;

    RETURN_SIZED_ENUMERATOR(ehash, 0, 0, rb_env_size);
    values = env_values();
    for (i=0; i<RARRAY_LEN(values); i++) {
	rb_yield(RARRAY_AREF(values, i));
    }
    return ehash;
}

.fetch(name) ⇒ value .fetch(name, default) ⇒ value .fetch(name) {|missing_name| ... } ⇒ value

Retrieves the environment variable name.

If the given name does not exist and neither default nor a block is provided, a ::KeyError is raised. If a block is given it is called with the missing name to provide a value. If a default value is given it will be returned when no block is given.

[ GitHub ]

  
# File 'hash.c', line 4778

static VALUE
env_fetch(int argc, VALUE *argv)
{
    VALUE key;
    long block_given;
    const char *nam, *env;

    rb_check_arity(argc, 1, 2);
    key = argv[0];
    block_given = rb_block_given_p();
    if (block_given && argc == 2) {
	rb_warn("block supersedes default value argument");
    }
    nam = env_name(key);
    env = getenv(nam);
    if (!env) {
	if (block_given) return rb_yield(key);
	if (argc == 1) {
	    rb_key_err_raise(rb_sprintf("key not found: \"%"PRIsVALUE"\"", key), envtbl, key);
	}
	return argv[1];
    }
    return env_name_new(nam, env);
}

.select {|name, value| ... } ⇒ Hash .selectEnumerator .filter {|name, value| ... } ⇒ Hash .filterEnumerator
Also known as: .select

Returns a copy of the environment for entries where the block returns true.

Returns an ::Enumerator if no block was given.

filter is an alias for .select.

[ GitHub ]

  
# File 'hash.c', line 5350

static VALUE
env_select(VALUE ehash)
{
    VALUE result;
    VALUE keys;
    long i;

    RETURN_SIZED_ENUMERATOR(ehash, 0, 0, rb_env_size);
    result = rb_hash_new();
    keys = env_keys();
    for (i = 0; i < RARRAY_LEN(keys); ++i) {
	VALUE key = RARRAY_AREF(keys, i);
	VALUE val = rb_f_getenv(Qnil, key);
	if (!NIL_P(val)) {
	    if (RTEST(rb_yield_values(2, key, val))) {
		rb_hash_aset(result, key, val);
	    }
	}
    }
    RB_GC_GUARD(keys);

    return result;
}

.select! {|name, value| ... } ⇒ ENV? .select!Enumerator .filter! {|name, value| ... } ⇒ ENV? .filter!Enumerator
Also known as: .select!

Equivalent to .keep_if but returns nil if no changes were made.

filter! is an alias for .select!.

[ GitHub ]

  
# File 'hash.c', line 5385

static VALUE
env_select_bang(VALUE ehash)
{
    VALUE keys;
    long i;
    int del = 0;

    RETURN_SIZED_ENUMERATOR(ehash, 0, 0, rb_env_size);
    keys = env_keys();
    RBASIC_CLEAR_CLASS(keys);
    for (i=0; i<RARRAY_LEN(keys); i++) {
	VALUE val = rb_f_getenv(Qnil, RARRAY_AREF(keys, i));
	if (!NIL_P(val)) {
	    if (!RTEST(rb_yield_values(2, RARRAY_AREF(keys, i), val))) {
		FL_UNSET(RARRAY_AREF(keys, i), FL_TAINT);
                env_delete(RARRAY_AREF(keys, i));
		del++;
	    }
	}
    }
    RB_GC_GUARD(keys);
    if (del == 0) return Qnil;
    return envtbl;
}

.freezeraises TypeError

Ruby does not allow ENV to be frozen, so calling freeze raises ::TypeError.

[ GitHub ]

  
# File 'hash.c', line 5819

static VALUE
env_freeze(VALUE self)
{
    rb_raise(rb_eTypeError, "cannot freeze ENV");
    return self; /* Not reached */
}

.key?(name) ⇒ Boolean .include?(name) ⇒ Boolean .has_key?(name) ⇒ Boolean .member?(name) ⇒ Boolean

Alias for .key?.

.value?(value) ⇒ Boolean .has_value?(value) ⇒ Boolean

Alias for .value?.

.key?(name) ⇒ Boolean .include?(name) ⇒ Boolean .has_key?(name) ⇒ Boolean .member?(name) ⇒ Boolean

Alias for .key?.

.index(value) ⇒ key

Deprecated method that is equivalent to .key

[ GitHub ]

  
# File 'hash.c', line 5746

static VALUE
env_index(VALUE dmy, VALUE value)
{
    rb_warn("ENV.index is deprecated; use ENV.key");
    return env_key(dmy, value);
}

.inspectString

Returns the contents of the environment as a ::String.

[ GitHub ]

  
# File 'hash.c', line 5497

static VALUE
env_inspect(void)
{
    char **env;
    VALUE str, i;

    str = rb_str_buf_new2("{");
    env = GET_ENVIRON(environ);
    while (*env) {
	char *s = strchr(*env, '=');

	if (env != environ) {
	    rb_str_buf_cat2(str, ", ");
	}
	if (s) {
	    rb_str_buf_cat2(str, "\"");
	    rb_str_buf_cat(str, *env, s-*env);
	    rb_str_buf_cat2(str, "\"=>");
	    i = rb_inspect(rb_str_new2(s+1));
	    rb_str_buf_append(str, i);
	}
	env++;
    }
    FREE_ENVIRON(environ);
    rb_str_buf_cat2(str, "}");
    OBJ_TAINT(str);

    return str;
}

.invertHash

Returns a new hash created by using environment variable names as values and values as names.

[ GitHub ]

  
# File 'hash.c', line 5860

static VALUE
env_invert(void)
{
    return rb_hash_invert(env_to_hash());
}

.keep_if {|name, value| ... } ⇒ Hash .keep_ifEnumerator

Deletes every environment variable where the block evaluates to false.

Returns an enumerator if no block was given.

[ GitHub ]

  
# File 'hash.c', line 5419

static VALUE
env_keep_if(VALUE ehash)
{
    RETURN_SIZED_ENUMERATOR(ehash, 0, 0, rb_env_size);
    env_select_bang(ehash);
    return envtbl;
}

.key(value) ⇒ name

Returns the name of the environment variable with value. If the value is not found nil is returned.

[ GitHub ]

  
# File 'hash.c', line 5716

static VALUE
env_key(VALUE dmy, VALUE value)
{
    char **env;
    VALUE str;

    SafeStringValue(value);
    env = GET_ENVIRON(environ);
    while (*env) {
	char *s = strchr(*env, '=');
	if (s++) {
	    long len = strlen(s);
	    if (RSTRING_LEN(value) == len && strncmp(s, RSTRING_PTR(value), len) == 0) {
		str = env_str_new(*env, s-*env-1);
		FREE_ENVIRON(environ);
		return str;
	    }
	}
	env++;
    }
    FREE_ENVIRON(environ);
    return Qnil;
}

.key?(name) ⇒ Boolean .include?(name) ⇒ Boolean .has_key?(name) ⇒ Boolean .member?(name) ⇒ Boolean
Also known as: .include?, .member?, .has_key?

Returns true if there is an environment variable with the given name.

[ GitHub ]

  
# File 'hash.c', line 5618

static VALUE
env_has_key(VALUE env, VALUE key)
{
    const char *s;

    s = env_name(key);
    if (getenv(s)) return Qtrue;
    return Qfalse;
}

.keysArray

Returns every environment variable name in an ::Array

[ GitHub ]

  
# File 'hash.c', line 5115

static VALUE
env_keys(void)
{
    char **env;
    VALUE ary;

    ary = rb_ary_new();
    env = GET_ENVIRON(environ);
    while (*env) {
	char *s = strchr(*env, '=');
	if (s) {
	    rb_ary_push(ary, env_str_new(*env, s-*env));
	}
	env++;
    }
    FREE_ENVIRON(environ);
    return ary;
}

.length .size
Also known as: .size

Returns the number of environment variables.

[ GitHub ]

  
# File 'hash.c', line 5576

static VALUE
env_size(void)
{
    int i;
    char **env;

    env = GET_ENVIRON(environ);
    for (i=0; env[i]; i++)
	;
    FREE_ENVIRON(environ);
    return INT2FIX(i);
}

.key?(name) ⇒ Boolean .include?(name) ⇒ Boolean .has_key?(name) ⇒ Boolean .member?(name) ⇒ Boolean

Alias for .key?.

.update(hash) ⇒ Hash .update(hash) {|name, old_value, new_value| ... } ⇒ Hash .merge!(hash) ⇒ Hash .merge!(hash) {|name, old_value, new_value| ... } ⇒ Hash
Also known as: .update

Adds the contents of hash to the environment variables. If no block is specified entries with duplicate keys are overwritten, otherwise the value of each duplicate name is determined by calling the block with the key, its value from the environment and its value from the hash.

[ GitHub ]

  
# File 'hash.c', line 5923

static VALUE
env_update(VALUE env, VALUE hash)
{
    if (env == hash) return env;
    hash = to_hash(hash);
    rb_hash_foreach(hash, env_update_i, 0);
    return env;
}

.rassoc(value)

Returns an ::Array of the name and value of the environment variable with value or nil if the value cannot be found.

[ GitHub ]

  
# File 'hash.c', line 5684

static VALUE
env_rassoc(VALUE dmy, VALUE obj)
{
    char **env;

    obj = rb_check_string_type(obj);
    if (NIL_P(obj)) return Qnil;
    rb_check_safe_obj(obj);
    env = GET_ENVIRON(environ);
    while (*env) {
	char *s = strchr(*env, '=');
	if (s++) {
	    long len = strlen(s);
	    if (RSTRING_LEN(obj) == len && strncmp(s, RSTRING_PTR(obj), len) == 0) {
		VALUE result = rb_assoc_new(rb_tainted_str_new(*env, s-*env-1), obj);
		FREE_ENVIRON(environ);
		return result;
	    }
	}
	env++;
    }
    FREE_ENVIRON(environ);
    return Qnil;
}

.rehash

Re-hashing the environment variables does nothing. It is provided for compatibility with ::Hash.

[ GitHub ]

  
# File 'hash.c', line 5563

static VALUE
env_none(void)
{
    return Qnil;
}

.reject {|name, value| ... } ⇒ Hash .rejectEnumerator

Same as .delete_if, but works on (and returns) a copy of the environment.

[ GitHub ]

  
# File 'hash.c', line 5806

static VALUE
env_reject(void)
{
    return rb_hash_delete_if(env_to_hash());
}

.reject! {|name, value| ... } ⇒ ENV? .reject!Enumerator

Equivalent to .delete_if but returns nil if no changes were made.

Returns an ::Enumerator if no block was given.

[ GitHub ]

  
# File 'hash.c', line 5275

static VALUE
env_reject_bang(VALUE ehash)
{
    VALUE keys;
    long i;
    int del = 0;

    RETURN_SIZED_ENUMERATOR(ehash, 0, 0, rb_env_size);
    keys = env_keys();
    RBASIC_CLEAR_CLASS(keys);
    for (i=0; i<RARRAY_LEN(keys); i++) {
	VALUE val = rb_f_getenv(Qnil, RARRAY_AREF(keys, i));
	if (!NIL_P(val)) {
	    if (RTEST(rb_yield_values(2, RARRAY_AREF(keys, i), val))) {
		FL_UNSET(RARRAY_AREF(keys, i), FL_TAINT);
                env_delete(RARRAY_AREF(keys, i));
		del++;
	    }
	}
    }
    RB_GC_GUARD(keys);
    if (del == 0) return Qnil;
    return envtbl;
}

.replace(hash) ⇒ ENV

Replaces the contents of the environment variables with the contents of hash.

[ GitHub ]

  
# File 'hash.c', line 5883

static VALUE
env_replace(VALUE env, VALUE hash)
{
    VALUE keys;
    long i;

    keys = env_keys();
    if (env == hash) return env;
    hash = to_hash(hash);
    rb_hash_foreach(hash, env_replace_i, keys);

    for (i=0; i<RARRAY_LEN(keys); i++) {
        env_delete(RARRAY_AREF(keys, i));
    }
    RB_GC_GUARD(keys);
    return env;
}

.select {|name, value| ... } ⇒ Hash .selectEnumerator .filter {|name, value| ... } ⇒ Hash .filterEnumerator

Alias for .filter.

.select! {|name, value| ... } ⇒ ENV? .select!Enumerator .filter! {|name, value| ... } ⇒ ENV? .filter!Enumerator

Alias for .filter!.

.shiftArray?

Removes an environment variable name-value pair from ENV and returns it as an ::Array. Returns nil if when the environment is empty.

[ GitHub ]

  
# File 'hash.c', line 5833

static VALUE
env_shift(void)
{
    char **env;
    VALUE result = Qnil;

    env = GET_ENVIRON(environ);
    if (*env) {
	char *s = strchr(*env, '=');
	if (s) {
	    VALUE key = env_str_new(*env, s-*env);
	    VALUE val = env_str_new2(getenv(RSTRING_PTR(key)));
            env_delete(key);
	    result = rb_assoc_new(key, val);
	}
    }
    FREE_ENVIRON(environ);
    return result;
}

.length .size

Alias for .length.

.slice(*keys) ⇒ Hash

Returns a hash containing only the given keys from ENV and their values.

ENV.slice("TERM","HOME")  #=> {"TERM"=>"xterm-256color", "HOME"=>"/Users/rhc"}
[ GitHub ]

  
# File 'hash.c', line 5435

static VALUE
env_slice(int argc, VALUE *argv)
{
    int i;
    VALUE key, value, result;

    if (argc == 0) {
        return rb_hash_new();
    }
    result = rb_hash_new_with_size(argc);

    for (i = 0; i < argc; i++) {
        key = argv[i];
        value = rb_f_getenv(Qnil, key);
        if (value != Qnil)
            rb_hash_aset(result, key, value);
    }

    return result;
}

.[]=(name, value) .store(name, value) ⇒ value

Alias for .[]=.

.to_aArray

Converts the environment variables into an array of names and value arrays.

ENV.to_a # => [["TERM", "xterm-color"], ["SHELL", "/bin/bash"], ...]
[ GitHub ]

  
# File 'hash.c', line 5536

static VALUE
env_to_a(void)
{
    char **env;
    VALUE ary;

    ary = rb_ary_new();
    env = GET_ENVIRON(environ);
    while (*env) {
	char *s = strchr(*env, '=');
	if (s) {
	    rb_ary_push(ary, rb_assoc_new(env_str_new(*env, s-*env),
					  env_str_new2(s+1)));
	}
	env++;
    }
    FREE_ENVIRON(environ);
    return ary;
}

.to_hHash .to_h {|name, value| ... } ⇒ Hash

Creates a hash with a copy of the environment variables.

[ GitHub ]

  
# File 'hash.c', line 5788

static VALUE
env_to_h(void)
{
    VALUE hash = env_to_hash();
    if (rb_block_given_p()) {
        hash = rb_hash_to_h_block(hash);
    }
    return hash;
}

.to_hashHash

Creates a hash with a copy of the environment variables.

[ GitHub ]

  
# File 'hash.c', line 5760

static VALUE
env_to_hash(void)
{
    char **env;
    VALUE hash;

    hash = rb_hash_new();
    env = GET_ENVIRON(environ);
    while (*env) {
	char *s = strchr(*env, '=');
	if (s) {
	    rb_hash_aset(hash, env_str_new(*env, s-*env),
			       env_str_new2(s+1));
	}
	env++;
    }
    FREE_ENVIRON(environ);
    return hash;
}

.to_sENV

Returns “ENV”

[ GitHub ]

  
# File 'hash.c', line 5485

static VALUE
env_to_s(void)
{
    return rb_usascii_str_new2("ENV");
}

.update(hash) ⇒ Hash .update(hash) {|name, old_value, new_value| ... } ⇒ Hash .merge!(hash) ⇒ Hash .merge!(hash) {|name, old_value, new_value| ... } ⇒ Hash

Alias for .merge!.

.value?(value) ⇒ Boolean .has_value?(value) ⇒ Boolean
Also known as: .has_value?

Returns true if there is an environment variable with the given value.

[ GitHub ]

  
# File 'hash.c', line 5653

static VALUE
env_has_value(VALUE dmy, VALUE obj)
{
    char **env;

    obj = rb_check_string_type(obj);
    if (NIL_P(obj)) return Qnil;
    rb_check_safe_obj(obj);
    env = GET_ENVIRON(environ);
    while (*env) {
	char *s = strchr(*env, '=');
	if (s++) {
	    long len = strlen(s);
	    if (RSTRING_LEN(obj) == len && strncmp(s, RSTRING_PTR(obj), len) == 0) {
		FREE_ENVIRON(environ);
		return Qtrue;
	    }
	}
	env++;
    }
    FREE_ENVIRON(environ);
    return Qfalse;
}

.valuesArray

Returns every environment variable value as an ::Array

[ GitHub ]

  
# File 'hash.c', line 5179

static VALUE
env_values(void)
{
    VALUE ary;
    char **env;

    ary = rb_ary_new();
    env = GET_ENVIRON(environ);
    while (*env) {
	char *s = strchr(*env, '=');
	if (s) {
	    rb_ary_push(ary, env_str_new2(s+1));
	}
	env++;
    }
    FREE_ENVIRON(environ);
    return ary;
}

.values_at(name, ...) ⇒ Array

Returns an array containing the environment variable values associated with the given names. See also .select.

[ GitHub ]

  
# File 'hash.c', line 5324

static VALUE
env_values_at(int argc, VALUE *argv)
{
    VALUE result;
    long i;

    result = rb_ary_new();
    for (i=0; i<argc; i++) {
	rb_ary_push(result, rb_f_getenv(Qnil, argv[i]));
    }
    return result;
}