tun-a-fish, get it?

The on-line manual pages of the original tunefs, like all Berkeley commands, ended with a "Bugs" section. In this case, it read:

Bugs:
This program should work on active and mounted file systems, but it doesn't. Because the superblock is not kept in the buffer cache, the program will only take effect if it is run on dismounted file systems; if run on the root file system, the system must be rebooted.
You can tune a file system, but you can't tune a fish.

>>2
and here's a diff that's not mangled by shitchan:
8c8
< SYNOPSIS
---
SYNTASX
16c16
<        that  it  can  be  edited.  If −x is present, an x command is simulated
---
       that  it  can  be edited.  If ’−’ is present, an x command is simulated
352c352
<        sed(1), crypt(1)
---
       crypt(1), ex(1), sed(1)
366a367,369
       Try using ex(1) instead, since it has none of these  problems,  a  good
       set of error messages, a global undo capability, and (most importantly)
       crash recovery.