Interpret PATTERN as an extended regular expression If ACTION is recurse, grep reads all files under each directory, recursively this If ACTION is skip, directories are silently skipped. If an input file is a directory, use ACTION to process it.īy default, ACTION is read, which means that directories are read just as if they If ACTION is skip, devices are silently skipped. If an input file is a device, FIFO or socket, use ACTION to process it.īy default, ACTION is read, which means that devices are read just as if they were With the -v, -invert-match option (see below), count non-matching lines. Suppress normal output instead print a count of matching lines for each input file. Note: no whitespace may be given between the option and its argument. The default is 2 and is equivalent to -A 2 -B 2. Print num lines of leading and trailing context surrounding each match. So to return all lines and colour only matches: egrep -color=always '^|string1|string2' Is the regex ^ (match beginning of every line), the beginning of a line has no length so will If grep is made to match several strings, all of the matches will be colored, one exception color=alwaysīy default the matched text will be colored red. WHEN can be 'never', 'always', or 'auto' e.g. Surround the matching string with the marker from the GREP_COLOR environment variable. Print the byte offset within the input file before each line of output. Print NUM lines of leading context before matching lines. Process a binary file as if it were text this is equivalent Places a line containing - between contiguous groups of matches. Print NUM lines of trailing context after matching lines. Variant programs egrep and fgrep are available. By default, grep prints the matching lines. Grep searches the named input FILEs (or standard input if no filesĪre named, or the file name - is given) for lines containing a match to the
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