grab是一个简单但是非常快速的grep工具。
使用方法：
-O -- prit file offset of match -l -- do ot prit the matchig lie (Useful if you wat to see _all_ offsets; if you also prit the lie, oly the first match i the lie couts) -I -- eable highlightig of matches -c <> -- Use cores i parallel (useless ad eve slower i most situatios) <= 1 uses sigle-core -r -- recurse o directory -R -- same as -r
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