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Adding a missing verb "is" on line 723 :
"If the g (global) suffix is given, then every match to be replaced." should be "If the g (global) suffix is given, then every match is to be replaced."
Changing is to are on line 835 :
"Any previous contents of file is lost without warning." changed to "Any previous contents of file are lost without warning."
Event: This is from the Advanced UNIX Programming Course (Fall’23) at NTHU.