Basic Linux Tips and Tricks, Part 2 - page 2
What if there wasn't an error message when the application crashed or the program wouldn't run if installed?
Your computer keeps log files for main system functions and separate logs for many of its applications. The ones you'll usually want are the last parts of the logs with the error messages that just preceded whatever trouble your computer is in.
Finding stuff in the logs isn't hard--you can find most of the the application logs in the
alizard@terrarium:/var/log$ ls -al total 10156 drwxr-xr-x 18 root root 4096 2007-07-26 11:01 . drwxr-xr-x 16 root root 4096 2007-02-26 21:10 .. -rw-r----- 1 root root 4396 2007-07-26 14:42 acpid -rw-r----- 1 root root 1778 2007-07-22 11:37 acpid.1.gz [snip] -rw-r----- 1 root adm 77168 2007-07-26 18:45 auth.log -rw-r----- 1 root adm 156786 2007-07-23 11:05 auth.log.0 [snip]
Some of the entries are directories, find the related logs inside. When you see a numbered log extension, like auth.log , the most recent will be auth.log , the next most recent will be .log.0, .log.1, and so on. What you will be looking for is error messages, particularly if a sequence is interrupted before completion. If one has a video problem, the error messages will either be in xorg.0.log or messages. If the file extension is .gz , you can open it with
$ gunzip filename.gz
cd filename to open the directory it unzips to).
To open from the GUI, use Konqueror as a directory manager, go to
/var/log and click on the filename, the linked archive manager should open it.
Some logs will be under the application directories rather than in
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- 2Linux Top 3: Linus Lashes out, Linux 3.14 Gets PIE and Ubuntu One is Done.
- 3Linux Top 3: Ubuntu 14.04, Debian Gives Squeeze More Life and Red Hat Goes Atomic
- 4Linux Top 3: RHEL 6.5, Debian 7.2 and EOL for Linux 3.0.x
- 5Linux Top 3: CoreOS, Oracle Enterprise Linux 7 and Ubuntu 14.10