There are many GUI applications for viewing images in Linux, but this can be cumbersome for those who often work from the command line. What I'm going to introduce today are 3 useful CLI image viewers to view images on the terminal, so that those who use the CLI can work more efficiently.
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FIM is the acronym for Fbi IMproved, which means Fbi improved version.
Some people may not know Fbi, the full name of Fbi is linux framebuffer imageviewer. It uses the system's framebuffer to display images directly from the command line. The default image formats it displays are bmp, gif, jpeg, PhotoCD, png, ppm, tiff and xwd. For other formats, it will try to convert using ImageMagick.
Next, we will briefly introduce its installation and use.
Install FIM
FIM is available in the default repositories on deb based systems (eg Ubuntu, Linux Mint), so these users can install FIM with the apt-get command:
$ sudo apt-get install fim
If you can't install it directly, you may need to go to the "Download and build instructions" section of the official documentation page to download the source code and compile and install it.
Use of FIM
Once installed, you can display images with the "autoscale" option ( -a ) using the command:
$ fim -a dog.jpg
FIM supports opening multiple files at one time. For example, if there are many .jpg files in the current directory, you can use the wildcard * to open these files:
$ fim -a * .jpg
Or, to open all images in a directory, such as Pictures:
$ fim Pictures/我们还可以递归地打开文件夹及其子文件夹中的图像，然后对列表进行如下排序：
$ fim -R Pictures/ --sort要以 ASCII 格式呈现图像，可以使用 -t 选项：
$ fim -t dog.jpg
To quit FIM press ESC or q.
Finally, some common shortcut keys for controlling images in FIM are introduced:
PageUp/Down: previous image/next image
+/-: zoom in/out
a: auto zoom
w: suitable width
h: suitable height
j/k: pan down / pan up
f/m: Flip/Specular
r/R: rotate (clockwise and counterclockwise)
ESC /q: quit
To learn more, please refer to its man page:
$ man fim
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