grep command to search for specific file type

grep -v -i -e 'Enjoy' grep_tuts Preview Lines That Does not Contain the Given StringĮxample 10. To display all the lines that do not contain the given string. grep -r 'Enjoy' * Search For a Certain String Within The Current DirectoryĮxample 9. To search for a certain string in all files that exist in the current directory. grep -C 1 'hend' grep_tuts Preview Number of Lines Around a Certain StringĮxample 8. To display one line around (or after and before) the pattern you are searching for. grep -B 1 'hend' grep_tuts Preview Number of Lines Before a Certain StringĮxample 7. To display one line before the pattern you are searching for.

grep -A 2 'hend' grep_tuts Preview Number of Lines After a Certain StringĮxample 6. To display two lines after the pattern you are searching for. grep 'the.*lines' grep_tuts Search Using Regular Expression and Case SensitiveĮxample 5. Search Using Regular Expression and Case Sensitiveīut in case you did not use the -i option, there will be no result.

This means to search for any lines start with “the” string and ends with “lines.” Where the * denotes zero or more characters, and the -i option is to ignore “the” and “lines” case. To search for a certain pattern in a file regardless of case sensitivity. grep -i 'tutorial' grep_tuts Search For Case Insensitive StringĮxample 4. To search for a certain string in a file regardless of its case. grep 'hend' grep_tuts grep_tuts2 Search For a Certain String in Multiple FilesĮxample 3. Now to search for a specific string in multiple files, use the next command. cp grep_tuts grep_tuts2 Create Copy From The Example File Let’s make a copy from the grep_tuts file, which will use later on. If we check the output above, we can see that “test/app/readme.md” is in the list, too. The following command will print the same output: $ grep -R -include=*. Test/log/app_20200301.log:DATETIME - SQLException has OccurredĪs we can see, the file test/app/readme.md appears in the output as well.Īlternatively, we can also use one single –include option and let the GLOB expression contain multiple extensions. Test/log/app_20200401.log:DATETIME - ClassCastException has Occurred Test/log/app.log:DATETIME - NullPointerException has Occurred

Test/app/change_log.log:Fix the NullPointerException Problem when calling external APIs Test/app/readme.md: - Exceptions are well handled Now, let’s search for the word “Exception” on *.log and *.md files: $ grep -R -include=*.log -include=*.md 'Exception' test

–include=*.log is an example of the –include=GLOB option, which tells grep to only search files whose basename matches the given GLOB expressionĪlso, we can use multiple –include=GLOB options to ask the grep command to search on files that match multiple extensions.

That is, it’s going to search the given pattern in files in any subdirectory under test

Grep command to search for specific file type