On 8/12/19 4:30 PM, Dmitry Bogatov wrote: > [2019-08-11 18:08] Jesse Smith <jsm...@resonatingmedia.com> >>> No. When you output raw escape sequences on terminal, they will be >>> interpreted by terminal, so `head', `tail' and `grep' output will be >> readable and colored. Pager `less' with -R option also interpret escape >> symbols. >> >> I wasn't speaking theoretically. > No offence intended. Sorry if I sounded harsh.
No offence taken. I can understand why you'd expect the output to look normal. > >> I tried it and the "head", "cat" and "tail" commands mangle the lines >> of the log file when escape sequences are not escaped. Output from >> "less" is clean though and looks correct. > Interesting. Can you please send text that shows this behaviour? > Certainly. Attached is a file with the last 20 lines of the /var/boot/log file on a test machine. When I view the log with "less" the output looks normal. When I run the file through "head" "tail" or "cat" the "[ ok" part of the message line appears at the beginning of the text. This happens in both the text console and in a virtual terminal window. This output was achieved by turning off escape character filtering in bootlogd. The contents of the file are just written out raw, as the data comes into bootlogd. - Jesse
Sat Aug 10 20:32:12 2019: nm-dispatcher: req:2 'connectivity-change': new request (2 scripts) Sat Aug 10 20:32:12 2019: nm-dispatcher: req:2 'connectivity-change': start running ordered scripts... Sat Aug 10 20:32:15 2019: [....] Starting SMB/CIFS daemon: smbd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Sat Aug 10 20:32:15 2019: Applying power save settings...done. Sat Aug 10 20:32:15 2019: Setting battery charge thresholds...done. Sat Aug 10 20:32:15 2019: Radio device states restored. Sat Aug 10 20:32:15 2019: nm-dispatcher: req:3 'up' [eth0]: new request (2 scripts) Sat Aug 10 20:32:15 2019: nm-dispatcher: req:3 'up' [eth0]: start running ordered scripts... Sat Aug 10 20:32:16 2019: ModemManager[2258]: <info> Couldn't check support for device at '/sys/devices/pci0000:00/0000:00:03.0': not supported by any plugin Sat Aug 10 20:32:16 2019: Sat Aug 10 20:32:18 2019: [....] Starting VirtualBox AdditionsVBoxService 5.2.24_Debian r128122 (verbosity: 0) linux.amd64 (Jan 24 2019 21:06:36) release log Sat Aug 10 20:32:18 2019: 00:00:00.000361 main Log opened 2019-08-10T23:32:18.177888000Z Sat Aug 10 20:32:18 2019: 00:00:00.000582 main OS Product: Linux Sat Aug 10 20:32:18 2019: 00:00:00.000627 main OS Release: 4.13.0-1-amd64 Sat Aug 10 20:32:18 2019: 00:00:00.000665 main OS Version: #1 SMP Debian 4.13.13-1mx17 (2017-11-18) Sat Aug 10 20:32:18 2019: 00:00:00.000704 main Executable: /usr/sbin/VBoxService Sat Aug 10 20:32:18 2019: 00:00:00.000706 main Process ID: 2615 Sat Aug 10 20:32:18 2019: 00:00:00.000707 main Package type: LINUX_64BITS_GENERIC (OSE) Sat Aug 10 20:32:18 2019: 00:00:00.007391 main 5.2.24_Debian r128122 started. Verbose level = 0 Sat Aug 10 20:32:18 2019: [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
