By W. Richard Stevens
For greater than 20 years, severe C programmers have depended on one e-book for sensible, in-depth wisdom of the programming interfaces that force the UNIX and Linux kernels: W. Richard Stevens’ complicated Programming within the UNIX® atmosphere . Now, once more, Rich’s colleague Steve Rago has completely up-to-date this vintage paintings. the recent 3rd version helps today’s major systems, displays new technical advances and most sensible practices, and aligns with model four of the one UNIX Specification.
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Additional info for Advanced Programming in the UNIX(R) Environment
This option is useful for clarifying the layout. , from the matching text. -u, --unix-byte-offsets grep -u -b pattern filename This option only works under the MS-DOS and Microsoft Windows platforms and needs to be invoked with -b. This option will compute the byte-offset as if it were running under a Unix system and strip out carriage return characters. -Z, --null grep -Z pattern filename Prints an ASCII NUL (a zero byte) after each filename. This is useful when processing filenames that may contain special characters (such as carriage returns).
A group separator (--) is placed between each set of matches. In this case, it will print the next three lines after the matching line. This is useful when searching through source code, for instance. The example here will print three lines after any line that contains “Copyright”, which is typically at the top of source code files. -B NUM, --before-context=NUM grep -B 3 Copyright filename Same concept as the -A NUM option, except that it prints the lines before the match instead of after it. In this case, it will print the three lines before the matching line.
By default, PCRE treats a line of text as one line, even if several \n characters are present. PCRE_MULTILINE will allow for treating those \n characters as lines, so if $ or ^ is used, it will search lines based on the presence of \n and actual hard lines in the search string. PCRE_DOTALL causes PCRE to interpret the . (dot) metacharacter to include newlines when it does “wildcard” matching. PCRE_EXTENDED is useful for including comments (placed within unescaped # characters) in complicated search strings.
Advanced Programming in the UNIX(R) Environment by W. Richard Stevens