Linux Command Line Error Log
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2014 in Commands, File system, LinuxI am a new Linux
How To View Logs In Linux Command Line
user. I would like to know where are the how to check logs in linux server log files located under Debian/Ubuntu or CentOS/RHEL/Fedora Linux server? How do I open or linux /var/log/messages view log files on Linux operating systems? Almost all logfiles are located under /var/log directory and its sub-directories on Linux. You can
Linux Log Files Explained
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
How To Check Log Files In Unix
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 mthat make it easy to view logfiles. The most important command is "tail". Tail can be used to read the last lines from a file. Examples: Get the last 100 lines from what is /var/log/messages the Debian mail log file: tail -n 100 /var/log/mail.log To get all newly added
Linux Log Command
lines from a log file in realtime on the shell, use the command: tail -f /var/log/mail.log to quit tail and go how to check logs in putty back to the commanline press the keys [ctrl] + [c] If you want to get the last 1000 lines from a log file and they do not fit into your shell window, you can use http://www.cyberciti.biz/faq/linux-log-files-location-and-how-do-i-view-logs-files/ the command "more" to be able to view them line by line. tail -n 1000 /var/log/mail.log | more press [space] to go to the next line or [ctrl] + [c] to quit. If you want to search for a specific term in a large file, the command "grep" comes in handy. Example: We search for the email address "[emailprotected]" in the mail log file: grep "[emailprotected]" /var/log/mail.log If you want to http://www.faqforge.com/linux/distributions/debian/linux-how-to-view-log-files-on-the-shell/ view the whole content of file on the shell, use the command "cat". Example: cat /proc/cpuinfo will show you detailed info about the CPU of your computer. Till Basics, Debian, Ubuntu No Comments ← Where is the ISPConfig roadmap? Linux: Get detailed information about server hardware and partitions on the shell → Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website CAPTCHA-Code Search Categories Basics CentOS Controlpanels Debian Distributions Email FTP iPad & iPhone ISPConfig 2 ISPConfig 3 Linux & Unix Mac OS X MySQL PostgreSQL Programming Server Ubuntu Uncategorized Virtualisation Vista Webserver Windows Windows 10 Windows 7 Windows 8 XP Tags7 apache boot change consumer Debian default delete desktop disable error files Firefox install ISPConfig 2 ISPConfig 3 key Linux & Unix Linux & Unix manager menu metro mint MySQL OpenVZ password postfix powershell preview registry remove screen script search Shell startup system Thunderbird Ubuntu virtualbox Vista Windows Windows 7 Windows 8 XP Pages Imprint Copyright © 2016 FAQforge. Powered by WordPress. Theme: Spacious by ThemeGrill. We use cookies to ensure that we give you the best experience on our website. If you continue to use this site we will assume that you are happy with it.Ok
here 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 http://stackoverflow.com/questions/2729980/error-log-of-make-command-in-linux us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack http://stackoverflow.com/questions/7901517/how-to-redirect-stderr-and-stdout-to-different-files-in-the-same-line-of-bash Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Error log of make command in Linux up vote 8 down vote favorite 3 I am compiling a kernel module and it has many compilation errors in it. After running "make", the errors thrown out are too many to fit in how to the screen. Scrolling up doesn't reach the first error. I tried capturing the errors by doing make &2 > log which didn't work (log file was empty and the error messages were still dumped on screen). Can someone please tell me how to go about logging all the messages generated during compilation/make into a logfile? makefile compilation share|improve this question asked Apr 28 '10 at 13:47 Vishal Sagar 3081311 4 Try make &> log.txt –Paul R Apr 28 '10 at 13:51 how to check @PaulR How can it be that you put the ampersand before, and Nathan Fellman puts it after? –Janus Troelsen Aug 28 at 15:14 @JanusTroelsen: it depends on what shell you are using - the comment above assumes bash, but syntax differs between different shells –Paul R Aug 28 at 15:19 add a comment| 2 Answers 2 active oldest votes up vote 13 down vote accepted Try doing: make >&log the & after the > tells the shell to dump both stdout and stderr to the log. This can also be used with pipes. share|improve this answer answered Apr 28 '10 at 13:50 Nathan Fellman 46.5k62191270 Thanks this helped me. :) –Vishal Sagar Apr 30 '10 at 8:17 add a comment| up vote 13 down vote If you want to watch it scroll past, too: make 2>&1 | tee log (/bin/sh, bash and related) This sends the standard error to the same place as the standard output, then pipes them through tee to capture the result and still get screen action. share|improve this answer answered Apr 28 '10 at 14:08 dmckee 65.7k16101186 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Post as a guest Name Email Post as a guest Name Email discard By posting your answer, you agree to the privacy policy and terms of service. Not the answer you're looking for? Browse other q
here 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 us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to redirect stderr and stdout to different files in the same line of bash? up vote 92 down vote favorite 20 I know this much: $ command 2>> error $ command 1>> output Is there any way I can output the stderr to the error file and output stdout to the output file in the same line of bash? linux bash share|improve this question asked Oct 26 '11 at 10:36 user784637 4,0701958111 add a comment| 5 Answers 5 active oldest votes up vote 161 down vote accepted Just add them in one line command 2>> error 1>> output However, note that >> is for appending if the file already has data. Whereas, > will overwrite any existing data in the file. So, command 2> error 1> output if you do not want to append. Just for completion's sake, you can write 1> as just > since the default file descriptor is the output. so 1> and > is the same thing. So, command 2> error 1> output becomes, command 2> error > output share|improve this answer edited Oct 26 '11 at 10:45 answered Oct 26 '11 at 10:38 Sujoy 3,88122035 1 Great answer! I really like your explanation of how 1> can be written as > –user784637 Oct 26 '11 at 13:25 How is this different from like command &2>err.log, I think i am totally confusing sintaxies. (A link to an appropriate answer of all the bash pipe-isms might be in order) –ThorSummoner Jan 19 '15 at 5:19 2 @ThorSummoner tldp.org/LDP/abs/html/io-redirection.html is what I think you're looking for. Fwiw, looks like command &2>err.log isn't quite legit -- the ampersand in that syntax is used for file descriptor as target, eg command 1>&2 would reroute stdout to stderr. –DreadPirateShawn Sep 2 '15 at 16:32 add a comment| up vote 12 down vote Or if you like to mix outputs (stdout & stderr) in one single file you may want to use: command > merged-output.txt 2>&1 share|improve this answer answered Oct 26 '11 at 11:47 ztank1013 2,90121217 17 which is done simpler as "command &> merged-output.txt" –chhh Sep 4 '13 at 19:32 7 This is not an answer to the question. –Matthias Mar 11 '15 at 13:34 add a comment| up vote 8 down vote