term% cat index.txt HJFS(8) System Manager's Manual HJFS(8)
NAME
hjfs - file server maintenance
SYNOPSIS
allow
chatty
create path uid gid perm [lad]
df
disallow
dump
echo [on|off]
halt
newuser name [options]
users
sync
debug-chdeind file [offset value]
debug-deind file
debug-getblk file [blk|start end]
DESCRIPTION
The following commands should be written to the console of an hjfs(4)
file server.
Allow disables permission checking and allows changing file ownership
(see chgrp(1)). This may help in initializing a file system. Use this
with caution.
Chatty enables chatty 9p.
Create creates a file on the current file system. Uid and gid are
names or numbers from /adm/users. Perm is the low 9 bits of the per‐
mission mode of the file, in octal. An optional final l, a, or d cre‐
ates a locked file, append-only file, or directory.
Df prints the number of free, used and total blocks/megabytes. It
scans the block table and can be slow on large hard disks.
Disallow restores permission checking back to normal after a file sys‐
tem has been initialized.
Dump immediately starts a dump.
Echo expects the argument on or off. On causes all executed commands
to be printed on the system console. Off reverses the effects of on.
Halt exits the program.
Newuser requires a name argument. With no options it adds user name,
with group leader name, to /adm/users and makes the directory /usr/name
owned by user and group name. The options are
: Add a group: add the name to /adm/users but don't create the di‐
rectory. By convention, groups are numbered starting from
10000, users from 0.
newname
Rename existing user name to newname.
=leader
Change the leader of name to leader. If leader is missing, re‐
move the existing leader.
+member
Add member to the member list of name.
-member
Remove existing member from the member list of name.
After a successful newuser command the file server overwrites
/adm/users to reflect the internal state of the user table.
Users reads the contents of file /adm/users to initialize the file
server's internal representation of the users structure.
Sync writes dirty blocks in memory to the magnetic disk cache.
Note: Debug commands operate on internal data structures; they are in‐
herently dangerous and can cause file system damage.
Debug-chdeind changes the value of the byte at the specified offset in
the in-memory directory entry and prints the old value. Dangerous if
used carelessly.
Debug-deind requires a file argument. It prints the directory entry of
file.
Debug-getblk prints the physical blocks of file corresponding to the
logical block blk or the logical blocks between start and end.
EXAMPLES
Check disk usage (output appears on the system console).
% echo df >>/srv/hjfs.cmd
SEE ALSO
hjfs(4)
SOURCE
/sys/src/cmd/hjfs
BUGS
Debug-chdeind should perhaps be less crazy and have a portable inter‐
face.
HJFS(8)