Cat /var/log/messages Grep Error
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2014 in Commands, File system, LinuxI am a new Linux linux /var/log/messages user. I would like to know where are the
How To Check Logs In Linux
log files located under Debian/Ubuntu or CentOS/RHEL/Fedora Linux server? How do I open or linux log files explained view log files on Linux operating systems? Almost all logfiles are located under /var/log directory and its sub-directories on Linux. You can how to check logs in linux server change to this directory using the cd command. You need be the root user to view or access log files on Linux or Unix like operating systems. You can use the following commands to see the log files:less commandmore commandcat commandgrep commandtail commandzcat commandzgrep commandzmore commandHow
What Is /var/log/messages
do I view log files on Linux?Open the Terminal or login as root user using ssh command. Go to /var/log directory using the following cd command: # cd /var/log
To list files use the following ls command: # ls Sample outputs from RHEL 6.x server:anaconda.ifcfg.log boot.log-20111225 cron-20131110.gz maillog-20111218 messages-20131103.gz secure-20131027.gz spooler-20131117.gz up2date-20131117.gz anaconda.log btmp cron-20131117.gz maillog-20111225 messages-20131110.gz secure-20131103.gz squid uptrack.log anaconda.program.log btmp-20120101 cups maillog-20120101 messages-20131117.gz secure-20131110.gz swinstall.d uptrack.log.1 anaconda.storage.log btmp-20131101.gz dkms_autoinstaller maillog-20131027.gz mysqld.log secure-20131117.gz tallylog uptrack.log.2 anaconda.syslog collectl dmesg maillog-20131103.gz ntpstats setroubleshoot UcliEvt.log varnish anaconda.yum.log ConsoleKit dmesg.old maillog-20131110.gz prelink spooler up2date wtmp arcconfig.xml cron dracut.log maillog-20131117.gz rhsm spooler-20111211 up2date-20111211 yum.log atop cron-20111211 dracut.log-20120101 messages sa spooler-20111218 up2date-20111218 yum.log-20120101 audit cron-20111218 dracut.log-20130101.gz messages-20111211 secure spooler-20111225 up2date-20111225 yum.log-20130101.gz boot.log cron-20111225 httpd messages-20111218 secure-20111211 spooler-20120101 up2date-20120101 boot.log-20111204 cron-20120101 lastlog messages-20111225 secure-20111218 spooler-20131027.gz up2date-20131027.gz boot.log-20111211 cron-20131027.gz maillog meshere for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with how to view log files in linux us Unix & Linux Questions Tags Users Badges Unanswered Ask Question _ Unix & Linux Stack Exchange how to view logs in linux command line is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Join them; it only takes a minute: Sign up Here's
How To Check Log Files In Unix
how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top How to grep top most frequent error messages in a unix logfile up vote 5 down vote favorite 1 If I http://www.cyberciti.biz/faq/linux-log-files-location-and-how-do-i-view-logs-files/ have a file example apache log file How to extract the top most frequent error messages in a unix log file with no timestamps the key is most frequent error message should come on top of the list linux shell grep webserver share|improve this question edited May 22 '14 at 19:18 Vldb.User 71 asked Oct 23 '13 at 5:22 Jaya William 76124 migrated from serverfault.com Oct 23 '13 at 22:04 This question came from our site for system and network administrators. 1 grep message logfile | http://unix.stackexchange.com/questions/97341/how-to-grep-top-most-frequent-error-messages-in-a-unix-logfile sort | uniq -c | sort -n | head –MadHatter Oct 23 '13 at 5:45 Sorry, head should read tail. –MadHatter Oct 23 '13 at 5:58 Thanks for the edit, more clearly defining the question; Ursadon has answered it for you, so could you please accept his or her answer so we can stop this question popping up again? As you will gather by the slowly-accumulating downvotes, this question is arguably off-topic for SF. –MadHatter Oct 23 '13 at 7:27 add a comment| 2 Answers 2 active oldest votes up vote 10 down vote cat /tmp/file: ERROR 1 1234 ERROR 2 1234 ERROR 3 1234 ERROR 4 1234 ERROR 4 1234 ERROR 3 1234 ERROR 2 1234 ERROR 5 1234 ERROR 1 1234 ERROR 4 1234 ERROR 1 1234 ERROR 1 1234 ERROR 1 1234 ERROR 3 1234 ERROR 2 1234 ERROR 1 1234 ERROR 4 1234 ERROR 1 1234 ERROR 4 1234 ERROR 1 1234 ERROR 2 1234 grep "ERROR" /tmp/file | sort | uniq -c | sort -r: 8 ERROR 1 1234 5 ERROR 4 1234 4 ERROR 2 1234 3 ERROR 3 1234 1 ERROR 5 1234 first column shows how many occurrences of each string were found Explanation: grep "ERROR" /tmp/file\ # select only ERROR string | sort\ # order | uniq -c\ # count duplicate items | sort -r # reverse order for top 5 errors, you can add |head -n5 share|improve this answer edited Oct 23 '13 at 22:51 Joseph R. 21.7k24485 answered Oct 23 '13 at
In submit Tutorials Questions Projects Meetups Main Site logo-horizontal DigitalOcean Community Menu Tutorials Questions Projects Meetups Main Site Sign Up Log In submit View All Results By: Sadequl Hussain Subscribe Subscribed Share https://www.digitalocean.com/community/tutorials/how-to-view-and-configure-linux-logs-on-ubuntu-and-centos Contents Contents We hope you find this tutorial helpful. In addition to guides like this one, we provide simple cloud infrastructure for developers. Learn more → 9 How To View and Configure Linux Logs on https://help.ubuntu.com/community/LinuxLogFiles Ubuntu and Centos Posted Dec 17, 2013 162.6k views Logging Linux Basics CentOS Ubuntu Debian Introduction Linux system administrators often need to look at log files for troubleshooting purposes. In fact, this is the how to first thing any sysadmin would do. Linux and the applications that run on it can generate all different types of messages, which are recorded in various log files. Linux uses a set of configuration files, directories, programs, commands and daemons to create, store and recycle these log messages. Knowing where the system keeps its log files and how to make use of related commands can therefore help save valuable time how to check during troubleshooting. In this tutorial, we will have a look at different parts of the Linux logging mechanism. Disclaimer The commands in this tutorial were tested in plain vanilla installations of CentOS 6.4, Ubuntu 12 and Debian 7. Default Log File Location The default location for log files in Linux is /var/log. You can view the list of log files in this directory with a simple ls -l /var/log command. This is what I see in my CentOS system: [root@TestLinux ~]# ls -l /var/log total 1472 -rw-------. 1 root root 4524 Nov 15 16:04 anaconda.ifcfg.log -rw-------. 1 root root 59041 Nov 15 16:04 anaconda.log -rw-------. 1 root root 42763 Nov 15 16:04 anaconda.program.log -rw-------. 1 root root 299910 Nov 15 16:04 anaconda.storage.log -rw-------. 1 root root 40669 Nov 15 16:04 anaconda.syslog -rw-------. 1 root root 57061 Nov 15 16:04 anaconda.xlog -rw-------. 1 root root 1829 Nov 15 16:04 anaconda.yum.log drwxr-x---. 2 root root 4096 Nov 15 16:11 audit -rw-r--r-- 1 root root 2252 Dec 9 10:27 boot.log -rw------- 1 root utmp 384 Dec 9 10:31 btmp -rw-------. 1 root utmp 1920 Nov 28 09:28 btmp-20131202 drwxr-xr-x 2 root root 4096 Nov 29 15:47 ConsoleKit -rw------- 1 root root 2288 Dec 9 11:01 cron -rw-------. 1 r
Introduction Target Audience System Logs Authorization Log Daemon Log Debug Log Kernel Log Kernel Ring Buffer System Log Application Logs Apache HTTP Server Logs CUPS Print System Logs Rootkit Hunter Log Samba SMB Server Logs X11 Server Log Non-Human-Readable Logs Login Failures Log Last Logins Log Login Records Log System Logging Daemon (syslogd) Configuration of syslogd Echoing Messages to syslogd With Logger Log Rotation Essential Commands Getting Started Editing Files Viewing Files Viewing the Beginning of Files Viewing the End of Files Watching a Changing File Searching Files Resources Local System Resources WWW Resources Introduction One of the things which makes GNU/Linux a great operating system is that virtually anything and everything happening on and to the system may be logged in some manner. This information is invaluable for using the system in an informed manner, and should be one of the first resources you use to trouble-shoot system and application issues. The logs can tell you almost anything you need to know, as long as you have an idea where to look first. Your Ubuntu system provides vital information using various system log files. These log files are typically plain ASCII text in a standard log file format, and most of them sit in the traditional system log subdirectory /var/log. Many are generated by the system log daemon, syslogd on behalf of the system and certain applications, while some applications generate their own logs by writing directly to files in /var/log. This guide talks about how to read and use several of these system log files, how to use and configure the system logging daemon, syslogd, and how log rotation works. See the Resources section for additional information. Target Audience This guide will be simple enough to use if you have any experience using the console and editing text files using a text editor. See the end of this document for some essential commands that may help you find your way around these files if you're relatively new to the command line. System Logs System logs deal primarily with the functioning of the Ubun