dmesg with colored human-readable dates

dmesg -T|sed -e 's|\(^.*'`date +%Y`']\)\(.*\)|\x1b[0;34m\1\x1b[0m - \2|g'
Use sed to color the output of a human-readable dmesg output

21
By: jlaunay
2012-07-31 22:21:07

What Others Think

With sed it's easy to choose the bash color to use ;34 here for blue. You can also use grep to highlight the date instead of sed. dmesg -T| grep --color "^\[.*`date +%Y`\]" And export the GREP_COLORS variable to change the color. ex : export GREP_COLORS="fn=34:mc=01;30:ms=33:sl=21:cx=31"
jlaunay · 539 weeks and 3 days ago
dmesg -T works on my archlinux but on my debian server option -T does not exist. You can use perl if your dmesg does not support -T : dmesg|perl -ne "BEGIN{\$a= time()- qx!cat /proc/uptime!};s/\[\s*(\d+)\.\d+\]/localtime(\$1 + \$a)/e; print \$_;" | sed -e 's|\(^.*'`date +%Y`' \)\(.*\)|\x1b[0;34m\1\x1b[0m - \2|g'
jlaunay · 539 weeks and 3 days ago
Not working on CentOS: dmesg: invalid option -- T
dynaguy · 539 weeks and 3 days ago
-T option to dmesg is available on Fedora but not RHEL5/6.
foobrew · 539 weeks and 3 days ago
@dynaguy so as said on my previous comment on CentOS you should try : dmesg|perl -ne "BEGIN{\$a= time()- qx!cat /proc/uptime!};s/\[\s*(\d+)\.\d+\]/localtime(\$1 + \$a)/e; print \$_;" | sed -e 's|\(^.*'`date +%Y`' \)\(.*\)|\x1b[0;34m\1\x1b[0m - \2|g' If you get the error : bash: !}: event not found You need to turn off bash history substitution with : set +H
jlaunay · 539 weeks and 3 days ago
@jlaunay I just tried on CentOS 6.3 64bit. After "set +H" there is no more error message. But your command still doesn't give time stamp.
dynaguy · 539 weeks and 2 days ago
Recent CentOS use rsyslog. What I did is edit /etc/rsyslog.conf, add: kern.* /var/log/kern.log then "service rsyslog restart" Now you can view dmesg in file /var/log/kern.log with time/data
dynaguy · 539 weeks and 2 days ago
@dynaguy Good to know if I have to use CentOS one day.Thks
jlaunay · 539 weeks and 1 day ago
"dmesg -T" gives: "dmesg: invalid option -- 'T' Usage: dmesg [-c] [-n level] [-r] [-s bufsize]"
mpb · 539 weeks and 1 day ago
@mpb you should have a look at the previous comments. I gave an alternative usefull on OS using a dmesg which doesn't support the -T option.
jlaunay · 539 weeks and 1 day ago
@dynaguy -- no need to turn off bash history substitution. Change the bangs to ':'. The bangs are simply used as delimiters to the qx function, and were simply chosen as a character which wouldn't conflict with all of the other possible delimiters being used in the expression being quoted. Using ':' instead doesn't cause the history substitution problems...
bartonski · 539 weeks ago
@dynaguy -- no need to turn off bash history substitution. Change the bangs to ':'. The bangs are simply used as delimiters to the qx function, and were simply chosen as a character which wouldn't conflict with all of the other possible delimiters being used in the expression being quoted. Using ':' instead doesn't cause the history substitution problems...
bartonski · 539 weeks ago
dmesg |ccze -A
kxdemon · 509 weeks and 5 days ago
The commands are pretty hard to execute themselves. But this one gave me an idea just how, I should have check this out soooner. Thanks!!!
freykarts · 89 weeks and 3 days ago
I was so glad to see the details regarding the commands you have shared here. Through such commands you can check this out perform various kinds of tasks that you want. The dmesg command is used with the colored human readable dates. Keep sharing more details here..
Alyssalauren · 43 weeks and 5 days ago
Your post is great. it rends me more owner info. I will follow your next posts, keep posting quality articles. sedecordle wordle
danielusa · 20 weeks and 5 days ago
How about you. I often use it on quordle moviedle it's very convenient.
lanikane68 · 14 weeks and 2 days ago
Good to know this tip for using CentOS. wordle getting over it
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