![]() ![]() The table below describes the options for the grep command. Each option except the -w option can be used with the egrep and fgrep commands. The syntax for the grep command is: grep options pattern filenames The options that you use with the grep command can modify your search. That used to only include 0123456789, but depending on the system and locale may include many more. Using the grep command does not change le content. This 0-9 matches collating elements in the 0 to 9 range in your locale. The is used for start-of-line anchor and accordingly is used for end-of-line anchor. The latter will be more like: 7:line with regex in 10-line fileĪnother executable that acts differently if it knows the file names is wc, the word counter programs: $ cat qq. Grep and egrep are tools that search for patterns in files and find all lines containing a particular string. so, there egrep is just grep -E with no any differences at all. While the former may give you: filename1:7:line with regex in 10-line file Is that the former knows about the individual files whereas the latter sees it as one file (with no name). The difference between that and: cat filename1 filename2 | grep -n regex Where you'll start seeing the difference is in variants when the extra information (the file names) is used by grep, such as with: grep -n regex filename1 filename2 In that sense grep regex
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