(grep.info.gz) Introduction

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 1 Introduction
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 `grep' searches the input files for lines containing a match to a given
 pattern list.  When it finds a match in a line, it copies the line to
 standard output (by default), or produces whatever other sort of output
 you have requested with options.
 
    Though `grep' expects to do the matching on text, it has no limits
 on input line length other than available memory, and it can match
 arbitrary characters within a line.  If the final byte of an input file
 is not a newline, `grep' silently supplies one.  Since newline is also
 a separator for the list of patterns, there is no way to match newline
 characters in a text.
 

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