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Top Forums UNIX for Dummies Questions & Answers Uncertainty on disk usage report Post 302170182 by Perderabo on Sunday 24th of February 2008 11:24:56 PM
Old 02-25-2008
I would assume that they are both correct. You need to read the description of each command carefully.

"The df utility displays the amount of disk space occupied by currently mounted file systems, the amount of used and available space, and how much of the file system's total capacity has been used."

"The du utility writes to standard output the size of the file space allocated to, and the size of the file space allocated to each subdirectory of, the file hierarchy rooted in each of the specified files."

The difference is space allocated to files which are not a part of the file hierarchy. One way a file can get in this state is for someone to rm it while it is open to a program. Now the file has no name (and thus is invisible to du) but it won't be deleted until the program closes it. Programs also intentionally do this to allocate a private temporary file that is guaranteed to disappear when they exit.
 

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acctsh(1M)																acctsh(1M)

NAME
acctsh: chargefee, ckpacct, dodisk, lastlogin, monacct, nulladm, prctmp, prdaily, prtacct, shutacct, startup, turnacct - shell procedures for accounting SYNOPSIS
login-name number [blocks] [files ...] number file [mmdd] file [heading] [reason] DESCRIPTION
Can be invoked to charge a number of units to login-name. A record is written to to be merged with other accounting records during the night. Should be initiated via It periodically checks the size of If the size exceeds blocks, 1000 by default, is invoked with argument switch. If the number of free disk blocks in the file system falls below 500, automatically turns off the collection of process accounting records via the argument to When at least this number of blocks is restored, the accounting will be activated again. This feature is sensitive to the frequency at which is executed, usually by Should be invoked by to perform the disk accounting functions. By default, it will do disk accounting on the special files in If the flag is used, it does a slower version of disk accounting by login directory. files specifies the one or more filesystem names where disk accounting is to be done. If files is used, disk accounting will be done on these filesystems only. If the flag is used, files should be mount points of mounted filesystem. If omitted, they should be the special file names of mountable filesystems. Invoked by to update which shows the last date on which each user logged in (see runacct(1M)). Should be invoked once each month or each accounting period. number indicates which month or period it is. If number is not given, it defaults to the current month (01 through 12). This default is useful if is to executed via on the first day of each month. creates summary files in and restarts summary files in Creates file with mode 664 and ensures that owner and group are It is called by various accounting shell procedures. Can be used to print the session record file normally created by (see acctcon(1M)). Invoked by (see runacct(1M)) to format a report of the previous day's accounting data. The report resides in where mmdd is the month and day of the report. The current daily accounting reports may be printed by typing prdaily. Previous days' accounting reports can be printed by using the mmdd option and specifying the exact report date desired. The flag prints a report of exceptional usage by login id for the specifed date. Previous daily reports are cleaned up and therefore inaccessible after each invocation of The flag prints a report of exceptional resource usage by command, and can be used on current day's accounting data only. Can be used to format and print any total accounting file. Should be invoked during a system shutdown to turn process accounting off and append a "reason" record to Should be called by system startup scripts to turn the accounting on whenever the system is brought up. An interface to (see acct(1M)) to turn process accounting or The argument turns accounting off, moves the current to the next free name in then turns accounting back on again. (incr is a number starting with and incrementing by one for each additional file.) is called by and thus can be run under and used to keep to a reasonable size. FILES
holds all accounting commands listed in section(1M) of this manual accumulator for fees working directory current file for per-process accounting used if gets large, and during execution of daily accounting procedure contains the limits for exceptional usage by command name contains the limits for exceptional usage by login id summary directory, should be saved login/logoff summary SEE ALSO
acct(1M), acctcms(1M), acctcom(1M), acctcon(1M), acctmerg(1M), acctprc(1M), cron(1M), diskusg(1M), fwtmp(1M), runacct(1M), acct(2), acct(4), utmp(4). STANDARDS CONFORMANCE
acctsh(1M)
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