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Why CAN’T we have the characters ”, ‘/’, ‘:’, ‘*’, ‘?’, ‘ < ', ' > ‘, ‘|’ in a file’s name in Windows?

Mark Sterling
Mark Sterling
Research Editor · Jan 25, 2026 · Updated Apr 13, 2026

Each of them has a special meaning on the command line, so if they showed up in filenames they would lead to ambiguity. is the path element separator on Windows and / is both the path separator on Unix-style systems and the normal command switch character. : is the character that indicates a dr…

101
Words

1 min
Read Time

#115
of 500 in Nature

+42%
vs Category Avg

The Short Answer

Each of them has a special meaning on the command line, so if they showed up in filenames they would lead to ambiguity. is the path element separator on Windows and / is both the path separator on Unix-style systems and the normal command switch character. : is the character that indicates a drive name as well as being the path separator for old (pre-OS X) Macintosh systems. ? and * are characters used as wildcards (aka globs) when specifying files. are used to redirect input and output to files. | is used to send the input of one command to the output of another command.

Analysis

Key Concepts: Command, path, separator

This explanation focuses on command, path, separator and spans 101 words across 7 sentences. At 42% above the average Nature explanation (71 words), this is one of the more thorough answers in this category, reflecting the complexity of the underlying question.

What This Answer Covers

The explanation opens with: “Each of them has a special meaning on the command line, so if they showed up in filenames they would lead to ambiguity.” It then elaboratesultimately building toward a complete picture across 7 connected points.

How This Compares in Nature

Ranked #115 of 500 Nature questions by answer depth (top 24%). This places it in the comprehensive tier — the top quarter of most thoroughly answered questions. Questions at this depth typically involve multi-faceted topics requiring nuanced explanation.

Frequently Asked Questions

Is there a simple explanation for why we have the characters '', '/', ':', '*', '?', ' < ', ' > ', '|' in a file's name in windows?

Each of them has a special meaning on the command line, so if they showed up in filenames they would lead to ambiguity. is the path element separator on Windows and / is both the path separator on Unix-style systems and the normal command switch…

How detailed is this explanation compared to similar Nature questions?

This is one of the most thorough answer at 101 words, ranked #115 of 500 Nature questions by depth. The key concepts covered are command, path, separator.

What approach does this answer take to explain we have the characters '', '/', ':', '*', '?', ' < ', ' > '?

The explanation uses direct explanation across 101 words. It is categorized under Nature and addresses the question through 1 analytical lens.