Unix/Linux – What those numbers after command names were in command name as in cat(1)?

Fig.01: What those numbers after command names were, as in ls(1)?

Fig.01: What those numbers after command names were, as in ls(1)?

Ever wonder what those numbers after command names were, as in ls(1)? It’s
the section of the manual the man page is in. The following will tell you more:

man man
man 1 ls
man 8 reboot

Examples and usage: Linux / Unix: View Overlapping Man Page With Same Names