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sed scripts can have comments (the line starting with the # symbol). The s (substitute) command is the most important sed command. sed allows simple programming, with commands such as q (quit). sed uses regular expressions, such as .* (zero or more of any character).
Regular expressions are used in search engines, in search and replace dialogs of word processors and text editors, in text processing utilities such as sed and AWK, and in lexical analysis. Regular expressions are supported in many programming languages. Library implementations are often called an "engine", [4] [5] and many of these are ...
Greed, in regular expression context, describes the number of characters which will be matched (often also stated as "consumed") by a variable length portion of a regular expression – a token or group followed by a quantifier, which specifies a number (or range of numbers) of tokens. If the portion of the regular expression is "greedy", it ...
Sed regular expressions, particularly those using the "s" operator, are much similar to Perl (sed is a predecessor to Perl). The default delimiter is "/", but any delimiter can be used; the default is s / regexp / replacement /, but s: regexp: replacement: is also a valid form. For example, to match a "pub" directory (as in the Perl example ...
Multiple quoting is particularly useful with regular expressions that contain usual delimiters such as quotes, as this avoids needing to escape them. An early example is sed, where in the substitution command s/regex/replacement/ the default slash / delimiters can be replaced by another character, as in s,regex,replacement,.
Ford Motor is recalling 272,817 vehicles in the United States due to concerns over battery failure, the National Highway Traffic Safety Administration (NHTSA) said on Thursday. The recall affects ...
Richard Gere, His Family Spend Time On Farm Enjoying ‘Basic Pleasures’ Of Nature After Hospitalization. As a U.S. citizen, Silva revealed that she voted in a U.S. election for the first time ...
There are other things referred to as SED that are much bigger than the UNIX software. For example, the flat panel display technology called SED (Surface-conduction electron-emitter display) is the main contender (along with OLED) to replace LCD and plasma displays. So SED will be up there with LCD and LED.--Lester 10:01, 4 December 2008 (UTC)