grep improvements

[elee1766]

@rminnich

[codecov]

Codecov Report

Patch coverage: 89.41% and project coverage change: +0.03 🎉

Comparison is base (921c08d) 75.35% compared to head (30cbe25) 75.38%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2712      +/-   ##
==========================================
+ Coverage   75.35%   75.38%   +0.03%     
==========================================
  Files         414      415       +1     
  Lines       42233    42222      -11     
==========================================
+ Hits        31825    31830       +5     
+ Misses      10408    10392      -16     

Impacted Files	Coverage Δ
cmds/core/grep/grep.go	92.03% <89.15%> (+10.28%)	⬆️
cmds/core/grep/grep_linux.go	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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