How to perform grep operation on all files in a directory

Question

Working with xenserver  and I want to perform a command on each file that is in a directory  grepping some stuff out of the output of the command and appending it in a file   I m clear on the command I want to use and how to grep out string s  as needed   But what I m not clear on is how do I have it perform this command on each file  going to the next  until no more files are found

User · Answer

grep  PATTERN   would be sufficient  By default  grep would skip all subdirectories  However  if you want to grep through them  grep -r  PATTERN   is the case

User · Answer

In Linux  I normally use this command to recursively grep for a particular text within a dir   grep -rni  string      where   r   recursive i e  search subdirectories within the current directory n   to print the line numbers to stdout i   case insensitive search

User · Answer

If you want to do multiple commands  you could use   for I in  ls   sql  do     grep  foo   I  gt  gt  foo log     grep  bar   I  gt  gt  bar log done

User · Answer

To search in all sub-directories  but only in specific file types  use grep with --include   For example  searching recursively in current directory  for text in   yml and   yaml    grep  text to search  -r   --include    yml yaml

User · Answer

Use find  Seriously  it is the best way because then you can really see what files it s operating on   find   -name    sql  -exec grep -H  slow          Note  the -H is mac-specific  it shows the filename in the results

[linux] How to perform grep operation on all files in a directory?

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