It's Past Time To Stop Using egrep & fgrep Commands, Per GNU grep 3.8 - Phoronix

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[tmatsuu]

egrepやfgrepを使用されている皆様、それらのコマンドは2007年にdeprecatedになってます。egrepの代わりにgrep -E、fgrepの代わりにgrep -Fを使いましょう。9/3にリリースされたGNU grepバージョン3.8から警告メッセージが表示されます。

[masterq]

fgrepなくなるとhowmが困るんだよなぁ