How do I grep two strings in a file?

How do I grep for multiple patterns?

  1. Use single quotes in the pattern: grep ‘pattern*’ file1 file2.
  2. Next use extended regular expressions: egrep ‘pattern1|pattern2’ *. py.
  3. Finally, try on older Unix shells/oses: grep -e pattern1 -e pattern2 *. pl.
  4. Another option to grep two strings: grep ‘word1\|word2’ input.

Can grep take multiple strings?

You can grep multiple strings in different files and directories. The tool prints all lines that contain the words you specify as a search pattern.

How do I use grep to find a string in a file?

The grep command searches through the file, looking for matches to the pattern specified. To use it type grep , then the pattern we’re searching for and finally the name of the file (or files) we’re searching in. The output is the three lines in the file that contain the letters ‘not’.

How do we use grep to search for a pattern in multiple files Vim?

From the root of your project, you can search through all your files recursively from the current directory like so: grep -R ‘. ad’ . The -R flag is telling grep to search recursively.

How do you grep two lines before and after?

To also show you the lines before your matches, you can add -B to your grep. The -B 4 tells grep to also show the 4 lines before the match. Alternatively, to show the log lines that match after the keyword, use the -A parameter. In this example, it will tell grep to also show the 2 lines after the match.

How do you grep a line and next line?

You can use grep with -A n option to print N lines after matching lines. Using -B n option you can print N lines before matching lines. Using -C n option you can print N lines before and after matching lines.

What does grep -V grep do?

-v means “invert the match” in grep, in other words, return all non matching lines. | is the pipe character, it takes the output of the command on the left hand side, and uses it as the input of the command on the right hand side. bc is like a command line calculator (to do basic math).

Is there a grep option?

Search for the given string in a file

  • Checking for the given string in multiple files. This is also one of the basic usage of grep command.
  • Case insensitive search.
  • Match regular expression in files.
  • Checking for full-words not for substring.
  • Recursive searching
  • Exclude pattern match.
  • Counting the number of matches

    • What is the significance of grep in the command?

    Grep is a command line utility in Unix and Linux systems. It is used for finding a search patterns in the content of a given file. With its unusual name, you may have guessed that grep is an acronym.