Fstat

fstat is a command similar to the lsof command Linux users are familiar with. Simply put, it returns a list of all open files and what user context they've been opened in. Handy arguments:

fstat -f /usr/local/etc - only return locked files from the filesystem containing /usr/local/etc/ (/usr, on most systems)
fstat -p qmail-send - only return files locked by the qmail-send process
fstat /usr/local/sbin/smbd - only return info on processes and users locking the file /usr/local/sbin/smbd.

User

To determine the file status for a particular user the -u username option is used:

%fstat -u joeuser
USER     CMD          PID   FD MOUNT      INUM MODE         SZ|DV R/W
joeuser fstat      96741 root /             2 drwxr-xr-x     512  r
joeuser fstat      96741   wd /usr     2378753 drwxr-xr-x     512  r
joeuser fstat      96741 text /usr     2308260 -r-xr-sr-x   14340  r
joeuser fstat      96741    0 /dev         93 crw--w----   ttyp0 rw
joeuser fstat      96741    1 /dev         93 crw--w----   ttyp0 rw
joeuser fstat      96741    2 /dev         93 crw--w----   ttyp0 rw
joeuser fstat      96741    3 /dev         26 crw-r-----     mem  r
joeuser fstat      96741    4 /dev         27 crw-r-----    kmem  r
joeuser fstat      96741    5 /         25179 -rw-r--r--   40960  r
joeuser csh          760 root /             2 drwxr-xr-x     512  r
joeuser csh          760   wd /usr     2378753 drwxr-xr-x     512  r
joeuser csh          760 text /         16628 -r-xr-xr-x  293060  r
joeuser csh          760   15 /dev         93 crw--w----   ttyp0 rw
joeuser csh          760   16 /dev         93 crw--w----   ttyp0 rw
joeuser csh          760   17 /dev         93 crw--w----   ttyp0 rw
joeuser csh          760   18 /dev         93 crw--w----   ttyp0 rw
joeuser csh          760   19 /dev         93 crw--w----   ttyp0 rw
joeuser sshd         759 root /             2 drwxr-xr-x     512  r
joeuser sshd         759   wd /             2 drwxr-xr-x     512  r
joeuser sshd         759 text /usr     1318917 -r-xr-xr-x  180452  r
joeuser sshd         759    0 /dev          6 crw-rw-rw-    null rw
joeuser sshd         759    1 /dev          6 crw-rw-rw-    null rw
joeuser sshd         759    2 /dev          6 crw-rw-rw-    null rw
joeuser sshd         759    3* internet stream tcp c23cf1d0
joeuser sshd         759    4* local stream c23b47a8 <-> c23b4c94
joeuser sshd         759    5* pipe c2335660 <-> c2335718      0 rw
joeuser sshd         759    6* pipe c2335718 <-> c2335660      0 rw
joeuser sshd         759    7 /dev         92 crw-rw-rw-   ptyp0 rw
joeuser sshd         759    8 /dev         92 crw-rw-rw-   ptyp0 rw
joeuser sshd         759    9 /dev         92 crw-rw-rw-   ptyp0 rw

See also

See also: iostat, netstat