Grep can be used on any file to check for pattern matches using global regular expression. … Grep is fast, powerful, and the workhouse of the command line. However, with the -v or --invert-match option it will count non-matching lines, enter: $ grep -v -c vivek /etc/passwd Sample outputs: 45 grep -c "reqd string" *.txt gives number of line count containing the required matching word in each file of the selected current directory. The line is longer than our terminal width so the text wraps around to the following lines, but this output corresponds to exactly one line in our FILE. grep simply finds lines containing a particular pattern. When the -v or --invert-match option is also used, grep stops after outputting NUM non-matching lines. use printf to print a tab character for you: grep "$(printf '\t')" … By default with grep with have -e argument which is used to grep a particular PATTERN. If you want to display all lines that contain a sequence of four digits that is itself not part of any longer sequence of digits, one way is: grep -P '(? $ grep -ivw -e 'the' -e 'every' /tmp/baeldung-grep Time for some thrillin' heroics. We can use grep -v to exclude the search item item. With -B (for before) and -A (for after), you can specify the number of lines that you want to see. In this tutorial, we’re going to be working with a file called muffin_recipe.txt. Grep NOT using grep -v. Using grep -v you can simulate the NOT conditions. grep -c 'word-to-search' fileNameHere For example, search a word named ‘vivek’ in /etc/passwd and count line if a word matches: $ grep -c vivek /etc/passwd OR $ grep -w -c vivek /etc/passwd Sample outputs: 1. While most uses of grep are for sorting data for syntax matches, what if you want to exclude a word or string with grep instead? If the -l option is in effect, and the -q option is not, the following shall be written for each file containing at least one selected input line: "%s ", Otherwise, if more than one file argument appears, and -q is not specified, the grep utility shall prefix each output line by: "%s:", The remainder of each output line … The grep command is used to search text or searches the given file for lines containing a match to the given strings or words. -v option is for invert match. The grep command supports a number of options for additional controls on the matching:-i: performs a case-insensitive search.-n: displays the lines containing the pattern along with the line numbers.-v: displays the lines not containing the specified pattern.-c: displays the count of the matching patterns. At its core is is used to find and change patterns of any size, but it has a whole bunch of options. Not sure how that relates to your problem.... sed is a relatively complex function. Over, if files contain thousands of lines, it would be painful identifying the file but not the line number. saved_output.txt:Violets are blue, $ # problem when -Z is not used $ grep -ril ' are ' | xargs grep ' you ' grep: abc: No such file or directory grep: xyz.txt: No such file or directory poem.txt:And so are you. at least \t seems to work fine. Do not forget to use the backslash before the pipe character.. grep is one of the most useful and powerful commands in Linux for text processing.grep searches one or more input files for lines that match a regular expression and writes each matching line to standard output..