.TH NEWER 1 .SH NAME newer \- test file modification dates .SH SYNOPSIS .B newer file1 file2 .SH DESCRIPTION .I newer yields a zero return code if .I file1 exists and .I file2 does not, or if .I file1 and .I file2 both exist and .IR file1 's modification time is at least as recent as that of .IR file2 . It yields a non-zero return code otherwise.