Download Conquering the Command Line: Unix and Linux Commands for by Mark Bates PDF

By Mark Bates

Discover ways to grasp and triumph over the main important and important command line instruments for Unix and Linux dependent platforms. during this ebook you will discover not just the main valuable command line instruments you want to recognize, but additionally the main worthy suggestions and flags for these instruments. Conquering the Command Line isn’t only a rehash of the guy web page for those instruments, yet relatively a human-readable walk-through of those instruments to make you immediately extra efficient on your day-by-day improvement existence.

NB: it is a joint-KF8 dossier, with either 'old' MOBI and 'new' KF8/AZW3 in a single dossier, as published through the author.

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Flex and bison programs often have hard-totrack string storage management bugs, because it is easy to forget that the string in yytext will be there only until the next token is scanned. This simple hash function and lookup routine works pretty well. I ran a group of text files through an instrumented version of the concordance program, with 4,429 different words and a total of 70,775 lookups. 0. r) {fputs("out of space\n", stderr); abort(); } r->next = sp->reflist; r->filename = filename; r->lineno = lineno; r->flags = flags; sp->reflist = r; Next is addref, the routine called from inside the scanner to add a reference to a particular word; it’s implemented as a linked list of reference structures chained from the symbol.

The I/O options available in scanners generated by flex and its predecessor lex have undergone extensive evolution over the past 30 years, so there are several different ways to manage a scanner’s input and output. Unless you make other arrangements, a scanner reads from the stdio FILE called yyin, so to read a single file, you need only set it before the first call to yylex. In Example 2-1, we add the ability to specify an input file to the word count program from Example 1-1. Example 2-1. Word count, reading one file /* even more like Unix wc */ %option noyywrap %{ int chars = 0; int words = 0; int lines = 0; %} %% [a-zA-Z]+ \n .

A character class that matches any character within the brackets. If the first character is a circumflex (^), it changes the meaning to match any character except the ones within the brackets. A dash inside the square brackets indicates a character range; for example, [0-9] means the same thing as [0123456789] and [a-z] means any lowercase letter. A - or ] as the first character after the [ is interpreted literally to let you include dashes and square brackets in character classes. POSIX introduced other special square bracket constructs that are useful when handling nonEnglish alphabets, described later in this chapter.

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