Find command

Shell Programming and Scripting
1

I need to search in my all directories with the word [today] present in the file whats the command.

2

Do you mean something like:

find $HOME -type f -exec grep -Fl '[today]' '{}' +

(the options are uppercase F and lowercase ell) which will give you just the names of your files containing the string [today] , or something like:

find $HOME -type f -exec grep -Fn '[today]' /dev/null '{}' +

which will give you the name of the file, the line # in that file, and the text of the lines containing that string.