-m NUM, --max-count=NUM
Stop reading a file after NUM matching lines. If the input is standard input from a regular file,
and NUM matching lines are output, grep ensures that the standard input is positioned to just
after the last matching line before exiting, regardless of the presence of trailing context lines.
This enables a calling process to resume a search. When grep stops after NUM matching lines, it
outputs any trailing context lines. When the -c or --count option is also used, grep does not
output a count greater than NUM. When the -v or --invert-match option is also used, grep stops
after outputting NUM non-matching lines.
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