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tools:grep [2024/09/28 02:55] – [Useful Commands] Humphrey Boa-Garttools:grep [2026/03/31 12:23] (current) – [External Links] Humphrey Boa-Gart
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 ==== Search Files in Current Directory ==== ==== Search Files in Current Directory ====
  
-You can also use grep to search inside all the files within a folder, and not just one. Just replace the filename with an asterisk. To search the PWD for all files containing //INSERTSTRING//, format your command as so:+You can also use ''grep'' to search inside all the files within a folder, and not just one. Just replace the filename with an asterisk. To search the pwd for all files containing //INSERTSTRING//, format your command as so:
  
   $ grep “INSERTSTRING” *   $ grep “INSERTSTRING” *
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   $ grep “INSERT*” *.txt   $ grep “INSERT*” *.txt
  
-The ''-R'' flag lets you search child directories. So to search your PWD **and** all child directories recursively for all files containing //INSERTSTRING//:+The ''-R'' flag lets you search child directories. So to search your pwd **and** all child directories recursively for all files containing //INSERTSTRING//:
  
   $ grep -R "INSERTSTRING" *   $ grep -R "INSERTSTRING" *
  
-You can combine flags as well. To search your PWD and all child directories recursively for all //.txt// files containing //INSERTSTRING//, and to make grep tell you the line number that the string is found on, combine the ''-R'' and ''-n'' flags like this:+You can combine flags as well. To search your pwd and all child directories recursively for all //.txt// files containing //INSERTSTRING//, and to make grep tell you the line number that the string is found on, combine the ''-R'' and ''-n'' flags like this:
  
   $ grep -Rn "INSERTSTRING" *.txt   $ grep -Rn "INSERTSTRING" *.txt
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 +==== More Command Flags ====
 +
 +There are more flags you can combine with these basic ''grep'' commands to fine-tune your search. Play around with them to see how they affect output!
 +
 +  * ''-i'' - Searches made with ''grep'' are case-sensitive. Use this flag to search for both uppercase and lowercase versions of the same string.
 +  * ''-l'' - Print only the filename(s) of search results. Incredibly useful when using ''-R'' on large directory trees.
 +  * ''-w'' - Match only whole words.
 +  * ''-x'' - Match only whole lines.
 +  * ''-v'' - Inverted search. Returns only non-matching lines.
 +  * ''-s'' - Suppress error messages. Useful in bash scripts.
 ===== Variations ===== ===== Variations =====
  
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 The DOS, OS/2 and Windows platforms provide the ''find'' command for simple string searches. Windows also provides the ''findstr'' command which approximates much of the functionality of ''grep'', or you can use the the ported version in [[tools:cygwin|Cygwin]]. The DOS, OS/2 and Windows platforms provide the ''find'' command for simple string searches. Windows also provides the ''findstr'' command which approximates much of the functionality of ''grep'', or you can use the the ported version in [[tools:cygwin|Cygwin]].
  
-===== External Links =====+===== Further Reading =====
  
-[[https://www.gnu.org/software/grep/|Official page for grep at the GNU Project]]+  * [[https://www.gnu.org/software/grep/|Official page for grep at the GNU Project]] 
 +  * [[rfc>9485|RFC 9485]] - Standardized specification for regular expressions used by grep.
  
  
 {{tag>Tools}} {{tag>Tools}}
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