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When displaying member names,
tar takes care to avoid
ambiguities caused by certain characters. This is called name
quoting. The characters in question are:
The exact way
tar uses to quote these characters depends on
the quoting style. The default quoting style, called
escape (see below), uses backslash notation to represent control
characters and backslash.
tar offers seven distinct quoting styles, which can be selected
using ‘--quoting-style’ option:
Sets quoting style. Valid values for style argument are: literal, shell, shell-always, c, escape, locale, clocale.
These styles are described in detail below. To illustrate their effect, we will use an imaginary tar archive ‘arch.tar’ containing the following members:
# 1. Contains horizontal tabulation character. a tab # 2. Contains newline character a newline # 3. Contains a space a space # 4. Contains double quotes a"double"quote # 5. Contains single quotes a'single'quote # 6. Contains a backslash character: a\backslash
Here is how usual
ls command would have listed them, if they
had existed in the current working directory:
$ ls a\ttab a\nnewline a\ space a"double"quote a'single'quote a\\backslash
No quoting, display each character as is:
$ tar tf arch.tar --quoting-style=literal ./ ./a space ./a'single'quote ./a"double"quote ./a\backslash ./a tab ./a newline
Display characters the same way Bourne shell does: control characters, except ‘\t’ and ‘\n’, are printed using backslash escapes, ‘\t’ and ‘\n’ are printed as is, and a single quote is printed as ‘\'’. If a name contains any quoted characters, it is enclosed in single quotes. In particular, if a name contains single quotes, it is printed as several single-quoted strings:
$ tar tf arch.tar --quoting-style=shell ./ './a space' './a'\''single'\''quote' './a"double"quote' './a\backslash' './a tab' './a newline'
Same as ‘shell’, but the names are always enclosed in single quotes:
$ tar tf arch.tar --quoting-style=shell-always './' './a space' './a'\''single'\''quote' './a"double"quote' './a\backslash' './a tab' './a newline'
Use the notation of the C programming language. All names are enclosed in double quotes. Control characters are quoted using backslash notations, double quotes are represented as ‘\"’, backslash characters are represented as ‘\\’. Single quotes and spaces are not quoted:
$ tar tf arch.tar --quoting-style=c "./" "./a space" "./a'single'quote" "./a\"double\"quote" "./a\\backslash" "./a\ttab" "./a\nnewline"
Control characters are printed using backslash notation, and a backslash as ‘\\’. This is the default quoting style, unless it was changed when configured the package.
$ tar tf arch.tar --quoting-style=escape ./ ./a space ./a'single'quote ./a"double"quote ./a\\backslash ./a\ttab ./a\nnewline
Control characters, single quote and backslash are printed using backslash notation. All names are quoted using left and right quotation marks, appropriate to the current locale. If it does not define quotation marks, use ‘'’ as left and as right quotation marks. Any occurrences of the right quotation mark in a name are escaped with ‘\’, for example:
$ tar tf arch.tar --quoting-style=locale './' './a space' './a\'single\'quote' './a"double"quote' './a\\backslash' './a\ttab' './a\nnewline'
Same as ‘locale’, but ‘"’ is used for both left and right quotation marks, if not provided by the currently selected locale:
$ tar tf arch.tar --quoting-style=clocale "./" "./a space" "./a'single'quote" "./a\"double\"quote" "./a\\backslash" "./a\ttab" "./a\nnewline"
You can specify which characters should be quoted in addition to those implied by the current quoting style:
Always quote characters from string, even if the selected quoting style would not quote them.
For example, using ‘escape’ quoting (compare with the usual escape listing above):
$ tar tf arch.tar --quoting-style=escape --quote-chars=' "' ./ ./a\ space ./a'single'quote ./a\"double\"quote ./a\\backslash ./a\ttab ./a\nnewline
To disable quoting of such additional characters, use the following option:
Remove characters listed in string from the list of quoted characters set by the previous ‘--quote-chars’ option.
This option is particularly useful if you have added
‘--quote-chars’ to your
TAR_OPTIONS (see TAR_OPTIONS)
and wish to disable it for the current invocation.
Note, that ‘--no-quote-chars’ does not disable those characters that are quoted by default in the selected quoting style.
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