Searching inside files in a script

[Khan Smith]

   Sent: Tuesday, October 12, 2021 at 6:22 PM
   From: "Dennis Williamson" <dennistwilliamson@gmail.com>
   To: "Khan Smith" <khansmith@mail.com>
   Cc: "Alex fxmbsw7 Ratchev" <fxmbsw7@gmail.com>, "help-bash"
   <help-bash@gnu.org>
   Subject: Re: Searching inside files in a script
   On Tue, Oct 12, 2021, 1:14 PM Khan Smith <khansmith@mail.com> wrote:
   >
   > Sent: Tuesday, October 12, 2021 at 3:46 PM
   > From: "Alex fxmbsw7 Ratchev" <fxmbsw7@gmail.com>
   > To: "Khan Smith" <khansmith@mail.com>
   > Cc: "help-bash" <help-bash@gnu.org>
   > Subject: Re: Searching inside files in a script
   > grep -r 'pattern' dir
   > possibly -E or -P or -F
   > -r for recursive into dirs
   >
   >
   >
   > I am trying to time the execution of grep using
   >
   > tim=${EPOCHREALTIME//[![:digit:]]/.}
   >
   > But tim is not returning anything
   >
   >
   > On Tue, Oct 12, 2021, 17:38 Khan Smith <[1]khansmith@mail.com> wrote:
   >
   > I am getting a number of error messages related to functionality
   > I
   > source to. I would like to have a function I can run to search a
   > text
   > pattern on specific directories or files. What can I do?
   > If I select a directory, I want to search inside the files in
   > that
   > directory.
   >
   > References
   >
   > 1. mailto:khansmith@mail.com
   Instead of doing it yourself just do
   time grep...

   Does the "time grep..." command also run grep?  For the timing part,
   how would I pass the result
   to a variable for printing?