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sed is a line-oriented text processing utility: it reads text, line by line, from an input stream or file, into an internal buffer called the pattern space. Each line read starts a cycle . To the pattern space, sed applies one or more operations which have been specified via a sed script . sed implements a programming language with about 25 ...
/V Displays all lines NOT containing the specified string. /C Displays only the count of lines containing the string. /N Displays line numbers with the displayed lines. /I Ignores the case of characters when searching for the string. Note: If a pathname is not specified, FIND searches the text typed at the prompt or piped from another command.
IS:/xxx/;999:/yyy/ insert the string /yyy/ before the next 999 occurrences of /xxx/ RS:/xxx/;999:/yyy/ replace the next 999 occurrences of the string /xxx/ with /yyy/ DS:/xxx/;999 delete the next 999 occurrences of the string /xxx/ Lastly, the commands can be further modified with V to turn on verify mode and with O to specify nth occurrence ...
Unlike all other cases mentioned here, (* and *) were and still are in wide use. However, many compilers treat them as a different type of commenting block rather than as actual digraphs, that is, a comment started with (* cannot be closed with } and vice versa.
/N Prints the line number before each line that matches. /M Prints only the filename if a file contains a match. /O Prints character offset before each matching line. /P Skip files with non-printable characters. /OFF[LINE] Do not skip files with offline attribute set. /A:attr Specifies color attribute with two hex digits. See "color /?"
(empty string) ε denoting the set containing only the "empty" string, which has no characters at all. ( literal character ) a in Σ denoting the set containing only the character a . Given regular expressions R and S, the following operations over them are defined to produce regular expressions:
In Unix-like operating systems, find is a command-line utility that locates files based on some user-specified criteria and either prints the pathname of each matched object or, if another action is requested, performs that action on each matched object.
Some commands are internal—built into COMMAND.COM; others are external commands stored on disk. When the user types a line of text at the operating system command prompt, COMMAND.COM will parse the line and attempt to match a command name to a built-in command or to the name of an executable program file or batch file on disk. If no match is ...