inverse the order of the lines
.IP "\fB-z\fP" 10
remove the time prefix from zsh history
+.IP "\fB-b\fP" 10
+remove the numeric prefix from bash history
.IP "\fB-c <fg modeline> <bg modeline> <fg highlight> <bg highlight>\fP" 10
select the display colors for the modeline and the highlighted line
.IP "\fB-o <output filename>\fP" 10