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Fstat

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The Mediawiki system (the 'software' that runs this site) capitalises all articles. Please note that commands on most UNIX and Unix-like systems are entered in lower case. As an example the article documenting the Ln command would be issued from the command line as 'ln'.

The fstat command is used to determine the status of file system objects (directories and files) in use by users and processes. It is similar in purpose to the GNU Project's lsof command.

The output from 'fstat' is very detailed and includes the user name, command or running process (often called a daemon or background service) and its associated pid number. It also shows the finer details of the file system including the I-Node, access permissions and size of the object.

Contents

Examples

The following sections demonstrate the command with example output.

File Name

To determine the file status for a particular file the option filename (with no '-option') is used. For example '/var/log/maillog':

%fstat /var/log/maillog
USER     CMD          PID   FD MOUNT      INUM MODE         SZ|DV R/W NAME
root     syslogd      501   14 /var     471071 -rw-r-----   31781   w /var/log/maillog

Note: this differs from the File System command below.

File System

To determine the file status for a particular file system the option -f directory or filename is used. For example '/var/log/maillog':

%fstat -f /var/log/maillog
USER     CMD          PID   FD MOUNT      INUM MODE         SZ|DV R/W
root     cron        3158   wd /var      23552 drwxr-x---     512   r
www      httpd       9107    2 /var     471057 -rw-r--r--  812160   w
www      httpd       9107    6 /var     471057 -rw-r--r--  812160   w
www      httpd       9107    7 /var     471058 -rw-r--r--  468741   w
www      httpd       9107   10 /var     541700 -rw-------       0   w
www      httpd       9107   11 /var     541700 -rw-------       0   w
root     cron         684   wd /var      23552 drwxr-x---     512   r
root     cron         684    3 /var     541727 -rw-------       3   w
smmsp    sendmail     677   wd /var    1036294 drwxrwx---     512   r
smmsp    sendmail     677    4 /var    1036296 -rw-------      49   w
root     sendmail     671   wd /var    1036291 drwxr-xr-x     512   r
root     sendmail     671    5 /var     541720 -rw-------      78   w
mysql    mysqld       649   wd /var      70809 drwx------     512   r
mysql    mysqld       649    1 /var      71171 -rw-rw----    1736   w
mysql    mysqld       649    2 /var      71171 -rw-rw----    1736   w
root     syslogd      501    3 /var     541715 -rw-------       3   w
root     syslogd      501   11 /var     471068 -rw-r--r--     194   w
root     syslogd      501   12 /var     471052 -rw-------      59   w
root     syslogd      501   13 /var     471045 -rw-------    5444   w

Note: this does not determine the file status of the specified directory or filename but the file status on the file system that particular item resides upon. In the case of this example /var was the underlying file system. To determine the actual user or process using a specific file use the 'File Name' method above.

Process

To determine the file status for a particular process the option -p pid-number is used. For example assuming sendmail is assigned a pid of 677 (determined from the ps commend):

%fstat -p 677
USER     CMD          PID   FD MOUNT      INUM MODE         SZ|DV R/W
smmsp    sendmail     677 root /             2 drwxr-xr-x     512   r
smmsp    sendmail     677   wd /var    1036294 drwxrwx---     512   r
smmsp    sendmail     677 text /usr    3014716 -r-xr-sr-x  583680   r
smmsp    sendmail     677    0 /dev          6 crw-rw-rw-    null   r
smmsp    sendmail     677    1 /dev          6 crw-rw-rw-    null   w
smmsp    sendmail     677    2 /dev          6 crw-rw-rw-    null   w
smmsp    sendmail     677    3* local dgram c23b49d8 <-> c23b4dac
smmsp    sendmail     677    4 /var     1036296 -rw-------      49  w

User

To determine the file status for a particular user the option -u username is used. For example when used against user account 'joeuser':

%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

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