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This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
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Select only those lines containing matches that form whole words. The test is that the matching substring must
either be at the beginning of the line, or preceded by a non-word constituent character. Similarly, it must be
either at the end of the line or followed by a non-word constituent character. Word-constituent characters are
letters, digits, and the underscore.
grep's regex also supports four special zero-width patterns: "\<","\>","\b", and "\B".
The first three match the zero-width transition between a word and a non-word character. The arrows only match in one direction (i.e. [nonword]\<[word], and [word]\>[nonword]), while "\b" matches both. They can also match at the beginning or ending of the string, like "^" and "$".
"\B" is the opposite of "\b", and only matches the transition between two characters of the same type, that is two word characters together or two non-word characters together. I only mention it for completeness, as it isn't useful here.
Finally, remember that a "word" character is a-z, A-Z, 0-9, and _ (underscore). This cannot be changed, so things can get trickier if you have to redefine what a word is.