org.unix4j.unix

Class Sed

java.lang.Object

org.unix4j.unix.Sed

public final class Sed
extends Object

Non-instantiable module with inner types making up the sed command.

NAME

sed - stream editor for filtering and transforming text

SYNOPSIS

	sed <args>
	sed <script>
	sed <regexp> <replacement>
	sed <regexp> <replacement> <occurrence>
	sed [-ngplIsaicdy] <regexp>
	sed [-ngplIsaicdy] <string1> <string2>
	sed [-ngplIsaicdy] <string1> <string2> <occurrence>

See Sed.Interface for the corresponding command signature methods.

DESCRIPTION

Sed is a stream editor. A stream editor is used to perform basic text transformations on an input stream (a file or input from a pipeline). While in some ways similar to an editor which permits scripted edits (such as ed), sed works by making only one pass over the input(s), and is consequently more efficient. But it is sed's ability to filter text in a pipeline which particularly distinguishes it from other types of editors.

Some examples:

input day into sed("s/day/night/") This will output "night"

input "day and night" into sed("s/\\sand\\s/-to-/") This will output "day-to-night"

(Note the use of \s whitespace character).
Java regular expressions are used for searching and replacing. For an overview of the Java pattern matching, and substitution, please see the Pattern documentation.

Options

The following options are supported:

	-n		--quiet		Suppress the default output (in which each line, after it is examined for editing, is written to standard output). Only lines explicitly selected for output are written.
	-g		--global		Globally substitute for all non-overlapping instances of the regexp rather than just the first one. (This option is ignored if the occurrence operand is specified).
	-p		--print		Write the matched line to standard output.
	-l		--lineNumber		Writes the current line number on a separate line to the standard output.
	-I		--ignoreCase		Use case insensitive pattern matching.
	-s		--substitute		Substitutes the replacement string for instances of the regexp in the matched line. The characters "$0" appearing in the replacement are replaced by the line matching the regexp. The characters "$n", where n is a digit other than zero, are replaced by the text matched by the corresponding backreference expression (aka group). The special meaning of "$n" in this context can be suppressed by preceding it by a backslash. A line can be split by substituting a newline ('\n') into it. A substitution is considered to have been performed even if the replacement string is identical to the string that it replaces.
	-a		--append		Append string2 as a separate line after the matched line.
	-i		--insert		Insert string2 as a separate line before the matched line.
	-c		--change		Write string2 as a separate line instead of the matched line.
	-d		--delete		Delete the matched line.
	-y		--translate		Replace all occurrences of characters in string1 with the corresponding characters in string2. If the number of characters in the two strings are not equal, or if any of the characters in string1 appear more than once, the results are undefined.

OPERANDS

The following operands are supported:

	<script>	:	String		Sed script as one string, such as "s/original/replacement/g".
	<regexp>	:	String		Regular expression matched against a line.
	<string1>	:	String		Regular expression matched against a line for all commands except for command y where string1 contains the source characters for the translation.
	<replacement>	:	String		Replacement string for substitute command. The characters "$0" appearing in the replacement are replaced by the line matching the regexp. The characters "$n", where n is a digit other than zero, are replaced by the text matched by the corresponding backreference expression (aka group). The special meaning of "$n" in this context can be suppressed by preceding it by a backslash.
	<string2>	:	String		Replacement string for substitute command s; appended, inserted or changed text for a, i and c command; destination characters for translate command y; ignored by all other commands. If string2 is a replacement string for the substitute command: the characters "$0" appearing in the replacement are replaced by the line matching the regexp; the characters "$n", where n is a digit other than zero, are replaced by the text matched by the corresponding backreference expression (aka group). The special meaning of "$n" in this context can be suppressed by preceding it by a backslash. (This operand only applies to the commands s, a, i, c and y and is ignored by all other commands).
	<occurrence>	:	int...		Substitute for the given occurrences only of the regexp found within the matched string; the occurrence indices are one-based. If empty or omitted, all occurrences are substituted. (This operand only applies to the substitute command and is ignored by all other commands).
	<args>	:	String...		String arguments defining the options and operands for the command. Options can be specified by acronym (with a leading dash "-") or by long name (with two leading dashes "--"). Operands other than the default "--script" operand have to be prefixed with the operand name (e.g. "--occurrence" for subsequent occurrence indices).
	<options>	:	SedOptions		Sed options and commands

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	Sed.Interface<R> Interface defining all method signatures for the "sed" command.

Field Summary

Fields

Modifier and Type	Field and Description
static SedFactory	Factory Singleton factory instance for the "sed" command.
static String	NAME The "sed" command name.
static SedOptionSets	Options Options for the "sed" command: n, g, p, l, I, s, a, i, c, d, y.

Method Summary

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

NAME

public static final String NAME

The "sed" command name.

See Also:

Constant Field Values

Options

public static final SedOptionSets Options

Options for the "sed" command: n, g, p, l, I, s, a, i, c, d, y.

	-n		--quiet		Suppress the default output (in which each line, after it is examined for editing, is written to standard output). Only lines explicitly selected for output are written.
	-g		--global		Globally substitute for all non-overlapping instances of the regexp rather than just the first one. (This option is ignored if the occurrence operand is specified).
	-p		--print		Write the matched line to standard output.
	-l		--lineNumber		Writes the current line number on a separate line to the standard output.
	-I		--ignoreCase		Use case insensitive pattern matching.
	-s		--substitute		Substitutes the replacement string for instances of the regexp in the matched line. The characters "$0" appearing in the replacement are replaced by the line matching the regexp. The characters "$n", where n is a digit other than zero, are replaced by the text matched by the corresponding backreference expression (aka group). The special meaning of "$n" in this context can be suppressed by preceding it by a backslash. A line can be split by substituting a newline ('\n') into it. A substitution is considered to have been performed even if the replacement string is identical to the string that it replaces.
	-a		--append		Append string2 as a separate line after the matched line.
	-i		--insert		Insert string2 as a separate line before the matched line.
	-c		--change		Write string2 as a separate line instead of the matched line.
	-d		--delete		Delete the matched line.
	-y		--translate		Replace all occurrences of characters in string1 with the corresponding characters in string2. If the number of characters in the two strings are not equal, or if any of the characters in string1 appear more than once, the results are undefined.

Factory

public static final SedFactory Factory

Singleton factory instance for the "sed" command.