BASH Fix Display and Console Garbage and Gibberish on a Linux / Unix / macOS nixCraft Updated Tutorials/Posts

Sometimes my R & D result in the weird output on the screen. For example, accidentally I run cat command over binary file – cat /sbin/*. You will be not able to access your bash/ksh/zsh based terminal. It will be full of wired character sequences that can lock down your display. These characters will hide what you type or character displayed into strange symbols. To clear gibberish all over the screen use the following method. This article describes how to really clear the terminal screen or reset terminal in Linux or Unix-like system. In other words, you will learn how to clear console garbage and gibberish without exiting the session on your Linux/Unix/macOS/BSD systems.

How to Fix Console Garbage and Gibberish on Linux and Unix

There are multiple commands to fix console gibberish or garbage. Let us see all commands and usage in details.

The clear command

The clear command clears your screen including its scrollback buffer.
$ clear
You can press CTRL+L to clear screen too. However, clear command won’t clear the terminal screen. Use the following methods to really clear the terminal so you get a get back a good working terminal.

How to fix the display using the reset command

Here is my console with gibberish all over the screen:

Fig.01: Bash fix the display
Fig.01: Bash fix the display

To fix the display just type the reset command. It will initialization terminal again for you:
$ reset
OR
$ tput reset

If reset command failed to work type the following command to restore the session to a normal state:
$ stty sane

Press CTRL + L to clear the screen (or type the clear command):
$ clear

Use ANSI escape sequence to really clear the bash terminal

Another option is to type the following ANSI escape sequence:

clear echo -e "3c"

Sample outputs from both commands:

Animated gif 01: Fix Unix Console Gibberish Command Demo
Animated gif 01: Fix Unix Console Gibberish Command Demo

Conclusion

This page showed how to fix your console when in garbage and gibberish state. This will clear your console without exit the whole session and restart. Now that you know how to reset screen to normal mode. Read man pages of stty and reset command here for more information stty(1),reset(1),bash(1).

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.

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