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UNICODE-SHOW(1) helper-scripts Manual UNICODE-SHOW(1) NAME unicode-show - Scan and annotate suspicious Unicode characters NAME unicode-show - detect and annotate non-ASCII or suspicious Unicode characters in text or files SYNOPSIS unicode-show [FILE]... DESCRIPTION unicode-show is a utility that reads text input (from standard input or files) and highlights suspicious Unicode characters, such as those out- side the safe ASCII range. This tool is useful for identifying poten- tially malicious or misleading Unicode characters in source code, logs, or user input. For each suspicious character, <strong>unicode-show</strong> prints: • The line it appears on, annotated with [U+XXXX] markers • A description including the character (if visible), Unicode code- point, character name, and category What is considered suspicious: • Characters outside the printable ASCII range (0x20-0x7E) • Control characters (excluding \n and \t) • Carriage returns (\r), even when used in CRLF pairs • Any character not in the standard set of ASCII letters, digits, punctuation, and trailing whitespace Output formatting: • Annotations are colorized using ANSI escape codes if stdout is a terminal and the environment is color-friendly • Red for inline [U+XXXX] markers • Cyan for character metadata descriptions Color output is disabled if: • The environment variable $NOCOLOR is set • The environment variable $NO_COLOR is set to 1 • $TERM is set to dumb • Output is redirected (non-interactive terminal) OPTIONS This tool takes no options. Any arguments are treated as file paths. If no arguments are given, input is read from standard input. EXIT STATUS • 0 - No suspicious Unicode characters found • 1 - Suspicious characters were detected • 2 - An error occurred (e.g., file I/O or decoding failure) EXAMPLES Scan a file for suspicious characters: unicode-show suspicious.txt Scan multiple files: unicode-show file1.txt file2.md Scan input from a pipeline: cat file1.txt | unicode-show Disable color output: NOCOLOR=1 unicode-show example.txt ENVIRONMENT • NOCOLOR - disables color output if set • NO_COLOR - disables color output if set to 1 • TERM - if set to dumb, disables color output AUTHOR This man page has been written by Patrick Schleizer (adrelanos@whonix.org). helper-scripts January 2020 UNICODE-SHOW(1)
NAME | NAME | SYNOPSIS | DESCRIPTION | For each suspicious character, <strong>unicode-show</strong> prints: | Color output is disabled if: | OPTIONS | EXIT STATUS | EXAMPLES | ENVIRONMENT | AUTHOR
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