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Editorial Team
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Asked: 2026-06-17T06:04:44+00:00

The uploaded image shows unusual characters (square matrix having digits written inside). This is

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enter image description here

The uploaded image shows unusual characters (square matrix having digits written inside). This is happening when I try to write 

 write(fd, buf,len)'s `buf` variable using fprintf function.

Is there any way to interpret these characters ?

Additional info:- write() is having a socket fd to write on.
Please tell me , If I am missing anything here.
Also, please retag this post , because I don’t know which tag is suitable for this post.
[edit] : please zoom the web page (using ctrl++), if these characters are not clearly visible.

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1 Answer

  1. Editorial Team

    They are all unprintable control characters, the box is just a way to print them. Another option is to not show them at all but then you wouldn’t know about them as easily.

    There’s

    • 0x1F Unit separator
    • 0x7F Delete
    • 0x01 Start of Heading
    • 0x1C File Separator

    (You can read all of the above from the boxes already)

    Since these are almost never used in text, you should probably not treat them as text. If you look at the meaning of them as control characters, they don’t make sense even as control characters.

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