On 6/23/19 8:18 AM, bitfreak25 wrote: > On Sun, 23 Jun 2019 06:04:29 -0500 > Dennis Williamson <dennistwilliam...@gmail.com> wrote: > >> On Sun, Jun 23, 2019, 5:31 AM bitfreak25 <bitfrea...@gmx.de> wrote: >> >>> OS: Arch Linux 5.1.12-arch1-1-ARCH (tty1) >>> Bash-Version: 5.0.7(1)-release >>> localization: de_DE.UTF-8 UTF-8 >>> keymap: de-latin1-nodeadkeys >>> >>> Description: >>> The command "cat /etc/localtime" was called in a tty-terminal. After that >>> some characters will be printed incorrectly (mostly "cyrillic" chars >>> instead of the correct ones). The typed chars seems to be handled correctly >>> (e.g. calling "exit") but the output is broken at this point. This >>> behaviour is reproducible on my other PC with Debian Stable (Bash-Version >>> in Debian: 4.4-5), so it seems to be a old bug. Changing to another tty or >>> rebooting the OS will fix this behaviour until the command is called again. >>> >>> Kind regards, >>> bitfreak >>> >>> >> >> >> /etc/localtime is symlinked to a file that contains time zone data. If you >> enter the command >> >> file -L /etc/localtime >> >> you'll see that that's the case. It contains data that's not meant to be >> displayed including control characters which cause the effect you observed. >> If you cat any so-called binary file such as this you are likely to see the >> same kind of thing happen. Entering the >> >> reset >> >> command in the affected terminal will correct the problem after it occurs. > > I kind of thought that this could be the reason. It also happens with > "cat /dev/urandom" which is stopped by [STRG] + [C]. > > It seems to be a very small bug thats only breaks the output with an > unusual command and there are already 3 workarounds. But in my opinion > it should be fixed some time as it isn't the correct behaviour like > doing it with a gui-terminal e.g. xfce4-terminal.
All GUI terminals in my experience display the correct behavior. The correct behavior is to: - faithfully emit the output you requested - thereby emit control characters which the terminal cannot properly parse - break terminal output in some cases, depending on the control characters in question Some programs, unlike cat, try to protect you from this effect. See for example, $ curl file:///etc/localtime Warning: Binary output can mess up your terminal. Use "--output -" to tell Warning: curl to output it to your terminal anyway, or consider "--output Warning: <FILE>" to save to a file. -- Eli Schwartz Arch Linux Bug Wrangler and Trusted User
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