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Linux and Unix-like shells like bash allow for the use of globs to approximate filenames and make file searching easier. I'm aware of the wildcard glob (*). What other globs exist in bash that I can make use of with grep?
grep -f *.txt
grep -f file1.txt file2.txt file3.txt
grep -f *.txt 1>/dev/null 2>/dev/null
Required, but never shown