What is the difference between grep commands:
grep text* ==> does not give any result grep text * ==> gives result
and what is different if I search text as “text”.
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Answer
grep requires (at least) two arguments — what you are searching for, and where you are searching for it. If the second argument is not provided, then it will use stdin instead.
grep text* is waiting for stdin to provide it something to search through.
grep text * is searching through all the files in the current directory and returning the results.