{"id":1363,"date":"2025-02-28T18:11:27","date_gmt":"2025-02-28T18:11:27","guid":{"rendered":"https:\/\/trouble.org\/?p=1363"},"modified":"2025-02-28T18:12:20","modified_gmt":"2025-02-28T18:12:20","slug":"watching-dmesg-on-mac","status":"publish","type":"post","link":"https:\/\/trouble.org\/?p=1363","title":{"rendered":"watching dmesg on mac"},"content":{"rendered":"

Simple script to watch dmesg for changes, something like “dmesg --follow<\/tt>” or “dmesg -w<\/tt>” on systems with a real dmesg<\/tt> command.<\/p>\n

:
\n
\n#<\/span>
\n# watch dmesg output on the mac for new results... useful since the mac<\/span>
\n# doesn't support the --follow\/-w\/etc. opts (at least for now!)<\/span>
\n# tries to update every second<\/span>
\n#<\/span>
\n
\n# number of seconds to sleep<\/span>
\nSLEEPY<\/span>=1<\/span>
\n
\nprev<\/span>=$(<\/span>mktemp<\/span>)<\/span>
\ncurr<\/span>=$(<\/span>mktemp<\/span>)<\/span>
\n
\n# get rid of temp files on exit<\/span>
\ntrap<\/span> "rm -f $prev<\/span> $curr<\/span>"<\/span> EXIT
\n
\n# initial... send to screen and tmp file<\/span>
\ndmesg<\/span> |<\/span> tee<\/span> -a<\/span> "$prev<\/span>"<\/span>
\n
\n# loop-till-I-can't-loop-no-mo<\/span>
\nwhile<\/span> true<\/span>; do<\/span>
\n    # get the latest, compare<\/span>
\n    dmesg<\/span> ><\/span> "$curr<\/span>"<\/span>
\n    diff<\/span> "$prev<\/span>"<\/span> "$curr<\/span>"<\/span> |<\/span> grep<\/span> '^>'<\/span> |<\/span> cut<\/span> -c3-<\/span>
\n    # move new to the old, snooze, repeat<\/span>
\n    mv<\/span> "$curr<\/span>"<\/span> "$prev<\/span>"<\/span>
\n    sleep<\/span> $SLEEPY<\/span>
\ndone<\/span><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"

Simple script to watch dmesg for changes, something like “dmesg –follow” or “dmesg -w” on systems with a real dmesg command. : # # watch dmesg output on the mac for new results… useful since the mac # doesn’t support the –follow\/-w\/etc. opts (at least for now!) # tries to update every second # # […]<\/p>\n","protected":false},"author":44,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[364,362,363],"tags":[169,324,365,366],"class_list":["post-1363","post","type-post","status-publish","format-standard","hentry","category-monitor","category-shell","category-system","tag-bash","tag-mac","tag-monitor","tag-system"],"_links":{"self":[{"href":"https:\/\/trouble.org\/index.php?rest_route=\/wp\/v2\/posts\/1363","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/trouble.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/trouble.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/trouble.org\/index.php?rest_route=\/wp\/v2\/users\/44"}],"replies":[{"embeddable":true,"href":"https:\/\/trouble.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1363"}],"version-history":[{"count":4,"href":"https:\/\/trouble.org\/index.php?rest_route=\/wp\/v2\/posts\/1363\/revisions"}],"predecessor-version":[{"id":1367,"href":"https:\/\/trouble.org\/index.php?rest_route=\/wp\/v2\/posts\/1363\/revisions\/1367"}],"wp:attachment":[{"href":"https:\/\/trouble.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1363"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/trouble.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1363"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/trouble.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1363"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}