159 lines
2.7 KiB
Plaintext
159 lines
2.7 KiB
Plaintext
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.TH ASCII 1
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.SH NAME
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ascii, unicode \- interpret ASCII, Unicode characters
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.SH SYNOPSIS
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.B ascii
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[
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.B -8cnt
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]
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[
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.B -dox
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.B -b
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.I n
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]
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[
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.I text
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]
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.PP
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.B unicode
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.IB hexmin - hexmax
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.PP
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.B unicode
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[
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.B -t
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]
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.I hex
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[
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\&...
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]
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.PP
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.B unicode
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[
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.B -n
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]
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.I characters
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.PP
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.B look
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.I hex
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.B /lib/unicode
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.SH DESCRIPTION
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.I Ascii
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prints the
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.SM ASCII
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values corresponding to characters and
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.I vice
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.IR versa ;
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under the
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.B -8
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option, the
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.SM ISO
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Latin-1 extensions (codes 0200-0377) are included.
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The values are interpreted in a settable numeric base;
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.B -o
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specifies octal,
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.B -d
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decimal,
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.B -x
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hexadecimal (the default), and
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.BI -b n
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base
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.IR n .
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.PP
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With no arguments,
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.I ascii
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prints a table of the character set in the specified base.
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Characters of
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.I text
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are converted to their
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.SM ASCII
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values, one per line. If, however, the first
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.I text
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argument is a valid number in the specified base, conversion
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goes the opposite way.
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Control characters are printed as two- or three-character mnemonics.
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Other options are:
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.TP
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.B -n
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Force numeric output.
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.TP
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.B -c
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Force character output.
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.TP
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.B -t
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Convert from numbers to running text; do not interpret
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control characters or insert newlines.
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.PP
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.I Unicode
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is similar; it converts between
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.SM UTF
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and character values from the Unicode Standard (see
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.IR utf (6)).
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If given a range of hexadecimal numbers,
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.I unicode
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prints a table of the specified Unicode characters \(em their values and
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.SM UTF
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representations.
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Otherwise it translates from
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.SM UTF
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to numeric value or vice versa,
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depending on the appearance of the supplied text;
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the
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.B -n
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option forces numeric output to avoid ambiguity with numeric characters.
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If converting to
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.SM UTF ,
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the characters are printed one per line unless the
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.B -t
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flag is set, in which case the output is a single string
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containing only the specified characters.
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Unlike
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.IR ascii ,
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.I unicode
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treats no characters specially.
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.PP
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The output of
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.I ascii
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and
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.I unicode
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may be unhelpful if the characters printed are not available in the current font.
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.PP
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The file
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.B /lib/unicode
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contains a
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table of characters and descriptions, sorted in hexadecimal order,
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suitable for
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.IR look (1)
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on the lower case
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.I hex
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values of characters.
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.SH EXAMPLES
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.TP
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.B "ascii -d"
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Print the
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.SM ASCII
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table base 10.
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.TP
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.B "unicode p"
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Print the hex value of `p'.
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.TP
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.B "unicode 2200-22f1"
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Print a table of miscellaneous mathematical symbols.
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.TP
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.B "look 039 /lib/unicode"
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See the start of the Greek alphabet's encoding in the Unicode Standard.
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.SH FILES
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.TF \fL/lib/unicode
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.TP
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.B /lib/unicode
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table of characters and descriptions.
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.SH SOURCE
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.B /sys/src/cmd/ascii.c
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.br
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.B /sys/src/cmd/unicode.c
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.SH "SEE ALSO"
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.IR look (1),
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.IR tcs (1),
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.IR utf (6),
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.IR font (6)
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