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

By: jlaunay

2012-07-31 22:21:07

dmesg sed

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 · 555 weeks and 6 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 · 555 weeks and 6 days ago

Not working on CentOS: dmesg: invalid option -- T

dynaguy · 555 weeks and 5 days ago

-T option to dmesg is available on Fedora but not RHEL5/6.

foobrew · 555 weeks and 5 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 · 555 weeks and 5 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 · 555 weeks and 4 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 · 555 weeks and 4 days ago

@dynaguy Good to know if I have to use CentOS one day.Thks

jlaunay · 555 weeks and 4 days ago

"dmesg -T" gives: "dmesg: invalid option -- 'T' Usage: dmesg [-c] [-n level] [-r] [-s bufsize]"

mpb · 555 weeks and 4 days 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 · 555 weeks and 4 days 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 · 555 weeks and 3 days ago

dmesg |ccze -A

kxdemon · 526 weeks and 1 day 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 · 105 weeks and 5 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..

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How about you. I often use it on quordle moviedle it's very convenient.

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rahimhh21 · 30 weeks and 4 days ago

Good to know this tip for using CentOS. wordle getting over it

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The commands Pokemon Showdown that you need to execute will be much more complex than simply a command as you share.

kevintexas0106 · 1 week and 4 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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