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grep "4294" -B 3 -A 3

grep -r "foo" .

# -H causes the filename to be printed (implied when multiple files are searched)
# -r does a recursive search
# -n causes the line number to be printed
# -I ignore binary files (complement: -a treat all files as text)
# -F treat search term as a literal, not a regular expression
# -i do a case-insensitive search
grep -HrnIFi --exclude-dir=.git "foo" app/