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NAMErescue —
rescue utilities in /rescue
DESCRIPTIONThe /rescue directory contains a collection of common utilities intended for use in recovering a badly damaged system. With the transition to a dynamically-linked root beginning with FreeBSD 5.2, there is a real possibility that the standard tools in /bin and /sbin may become non-functional due to a failed upgrade or a disk error. The tools in /rescue are statically linked and should therefore be more resistant to damage. However, being statically linked, the tools in /rescue are also less functional than the standard utilities. In particular, they do not have full use of the locale, pam(3), and nsswitch libraries.If your system fails to boot, and it shows a prompt similar to: Enter full pathname of shell or
RETURN for /bin/sh: the first thing to try running is the standard shell,
/bin/sh. If that fails, try running
/rescue/sh, which is the
/rescue/mount -uw / The next step is to double-check the contents of
/bin, /sbin, and
/usr/lib, possibly mounting a
FreeBSD rescue or “live file system”
CD-ROM (e.g., The /rescue tools are compiled using crunchgen(1), which makes them considerably more compact than the standard utilities. To build a FreeBSD system where space is critical, /rescue can be used as a replacement for the standard /bin and /sbin directories; simply change /bin and /sbin to be symbolic links pointing to /rescue. Since /rescue is statically linked, it should also be possible to dispense with much of /usr/lib in such an environment. In contrast to its predecessor /stand, /rescue is updated during normal FreeBSD source and binary upgrades. FILES
SEE ALSOcrunchgen(1), crash(8)HISTORYTherescue utilities first appeared in
FreeBSD 5.2.
AUTHORSTherescue system was written by Tim
Kientzle
<kientzle@FreeBSD.org>,
based on ideas taken from NetBSD. This manual page was
written by Simon L. Nielsen
<simon@FreeBSD.org>,
based on text by Tim Kientzle
<kientzle@FreeBSD.org>.
BUGSMost of therescue tools work even in a fairly crippled
system. The most egregious exception is the rescue
version of
vi(1), which
currently requires that /usr be mounted so that it can
access the
termcap(5)
files. Hopefully, a failsafe
termcap(3)
entry will eventually be added into the
ncurses(3)
library, so that /rescue/vi can be used even in a
system where /usr cannot immediately be mounted. In
the meantime, the rescue version of the
ed(1) editor
can be used from /rescue/ed if you need to edit files,
but cannot mount /usr.
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