This shows that the non-printing characters have octal values 13 and 14, respectively. For example, on System V: 3 On BSD, pipe the ls -q output through cat -v or od -c to see what the non-printing characters are. $ find -name '**' # this is broken (LC_COLLATE=en_US. This tells ls to print the octal value of any non-printing characters, preceeded by a backslash. Now we can see some options of cat to print special characters. cat / tmp / testing.txt testing testing more testing even more testing. Be sure to set the C locale or you get quite (seemingly) arbitrary behavior.Įxample: $ touch $(printf '\u03c0') "$(printf 'x\ty')"ĭir/ foo foo.c xrestop-0.4/ xrestop-0.4.tar.gz π As first thing let’s create a simple text file with these special characters, open a terminal and run the command: Now if you open the file with an editor you’ll have different results. Instead of specifying character ranges, can also be used to select "printable characters". Since LC_ALL=C causes find to interpret strings as ASCII, it will print multi-byte characters (such as π) as question marks. The hint for LC_ALL=C is required (actually, LC_CTYPE=C and LC_COLLATE=C), otherwise the character range is interpreted incorrectly. The default pair for a UTF-8 locale is '', and for other locales '>.'. Set the two characters used to indicate the presence of tabs and spaces. As mentioned in the OP, is the representation of NULL. The Caret notation of a character is a way to visualize non-printable characters. (The space is the first printable character listed on, ~ is the last.) If it is not configured for 'tiny', nano can display printable characters for tab and space, but it has no special provision for newline. The characters you are observing are non-printable characters which are often written in Carret notation. Assuming that "foreign" means "not an ASCII character", then you can use find with a pattern to find all files not having printable ASCII characters in their names: LC_ALL=C find.
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