Detailed Articles
Useful One Off Recipes
Disk Management
List directories from largest to smallest at the top level only. On older system h will not work and you must use k.
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du -sh * | sort |
Long Running Processes
Look for long running processes,
Other Useful Commands
MD5
Check if a file is corrupt,
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# On Ubuntu
md5sum /path/to/file
# On Solaris
digest -a md5 -v /path/to/file |
Information
Last
Last searches back through the file /var/log/wtmp (or the file designated by the -f flag) and displays a list of all users logged in (and out) since that file was created.
...
Lastb is the same as last, except that by default it shows a log of the file /var/log/btmp, which contains all the bad login attempts.
Integrity Checking
MD5
Check if a file is corrupt,
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# On Ubuntu
md5sum /path/to/file
# On Solaris
digest -a md5 -v /path/to/file |