Murphy's fourth law states that data expands to fill the disc space available, and there's a collaboration that states that it reaches that full point when you're trying to save a file you should have saved a long time ago during a complex operation.

I'm not a good one at deleting old backup files; I tend to have directories marked "january 06" and things like that; in that way I can go back to "when" and find old stuff. I want to know about the Geek cruise? Why - those notes are in October '04. Not sure of a date? A background grep can find stuff for me. So I've been running at 90% full for a while. Applications have been starting to grumble a little, and were starting to get a little bit more upset over the last day or two. Not helped by a mailbox that's getting hit by a fair flow of spams / viruses of about 179k each that get put in the trash quickly enough, but then stay there until the dustman commeth.

I'm on an OS X box. These same commands work for Linux and Solaris too:

df -k How full are my discs?

du -sk How big is the current directory and everything below it?

du -k How big is the current directory tree, directory by directory

du -sk * How big is EACH entity in the current directory? Really Useful!

It was using a du -sk * on my home directory that brought me, a few minutes ago, to an aptly named directory called "huge" of some 18Gbytes. A 2Gb copy of the entire DMOZ database, plus a 6 Gyte file that contained the entire thing replicated 3 times over, and a further copy of that 6Gbyte file chunked up into units of just 1Gbyte. The result of some well remembered, logged, important work on how Python can handle huge files, but some temporary data that was able to release 15% of my disc space with a single rm.
(written 2006-02-06, updated 2006-06-09)

 A101 - Web Application Deployment - Linux -An Introduction For Users
  [3256] Displaying a directory or file system tree - Linux - (2011-04-22)
  [3179] Oops - I typed ci not vi, and have lost my file ... - (2011-02-21)
  [2831] Recording (a macro) in vi - (2010-06-27)
  [2636] Linux - useful tips including history and file name completion - (2010-02-15)
  [2494] Making Linux Politically correct - (2009-11-06)
  [2479] Accidentally typed ci rather than vi? - (2009-10-27)
  [2300] What does x on a linux directory mean? - (2009-07-21)
  [2299] How much space does my directory take - Linux - (2009-07-20)
  [2203] Always use su with minus. And where do programs come from? - (2009-05-27)
  [2201] Running straight from the jar, but not from a tar - (2009-05-26)
  [1904] Ruby, Perl, Linux, MySQL - some training notes - (2008-11-23)
  [1902] sstrwxrwxrwx - Unix and Linux file permissions - (2008-11-23)
  [1897] Keeping on an even keel - (2008-11-21)
  [1893] Some Linux and Unix tips - (2008-11-18)
  [1803] FTP passive mode - a sometimes cure for upload hangs - (2008-09-20)
  [1764] Yank and Push - copy and move in vi - (2008-08-21)
  [1651] ls command - favourite options - (2008-05-23)
  [1527] Selecting file names in a shell - one word or another - (2008-02-02)
  [1438] Copy and paste / cut and paste and other vi techniques - (2007-11-20)
  [1408] Wireless hotel tips - FTP and Skype connections failing - (2007-10-26)
  [1366] awk - a powerful data extraction and manipulation tool - (2007-09-25)
  [1288] Linux run states, shell special commands, and directory structures - (2007-08-03)
  [1287] Work and play at Well House Manor - Football and Shell Shortcuts - (2007-08-02)
  [1259] Where am I and how did I get here? - (2007-07-05)
  [1068] ls -l report, Linux / Unix - types and permssions - (2007-02-06)
  [1013] Copy multiple files - confusing error message from cp - (2006-12-30)
  [1012] Moving files between Windows / DOS and Linux / Unix - (2006-12-30)
  [984] Cardinal numbers and magic numbers - (2006-12-14)
  [749] Cottage industry or production line data handling methods - (2006-06-07)
  [711] THE home directory or MY home directory - (2006-05-06)
  [710] Linux training Glasgow, Python programming course Dundee - (2006-05-05)
  [703] Copying files and preserving ownership - (2006-04-28)
  [679] More or less on the edge of the page - (2006-04-11)
  [659] Web Application Components - (2006-03-28)
  [431] File permissions of Linux and Unix systems - (2005-08-31)
  [430] Linux commands - some basics - (2005-08-31)
  [249] An easy way out - (2005-03-17)
  [152] Aladdin, or careful what you wish. - (2004-12-15)
  [74] pushd and popd - (2004-10-05)
  [73] vi - full circle - (2004-10-04)

A162 - Web Application Deployment - Backups and File System Management
  [1801] Will your backups work if you have to restore them? - (2008-09-18)
  [1765] Dialects of English and Unix - (2008-08-21)
  [1648] The tourists guide to Linux - (2008-05-20)
  [1439] Linux / Unix - layout of operating system files - (2007-11-20)
  [1023] Finding public writeable things on your linux file system - (2007-01-06)
  [754] tar, jar, war, ear, sar files - (2006-06-10)
  [735] Boys will be boys, saved by Ubuntu - (2006-05-27)
  [554] What backup is adequate? - (2006-01-04)
  [334] Symbolic links and hard links - (2005-06-02)
  [153] Linux - where to put swap space - (2004-12-16)

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Storing a regular expression in a perl variable
The magic of -textvariable
Add a friendly front end with Tk
Twice is a co-incidence and three times is a pattern
Finding where the disc space has gone
NOT Gone phishing
Key facts - SQL and MySQL
Danny and Donna are getting married
Robust PHP user inputs
Changing @INC - where Perl loads its modules