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Full Discussion: sed non ascii value remove
Top Forums Shell Programming and Scripting sed non ascii value remove Post 303043442 by Scrutinizer on Wednesday 29th of January 2020 12:27:07 AM
Old 01-29-2020
Classes like [:ascii:] and [:word:] are non-POSIX additional classes that can be found in perl, but are not recognised by standard sed.

Instead of [:ascii:], with GNU sed you could try a regex character range:
Code:
sed 's/[^\x00-\x7F]//g'  test.txt

To remove non-printable and non-"standard ascii" characters as RudiC suggests, you can try:
Code:
sed 's/[^\x20-\x7E]//g'  test.txt


--
Note:
I presume [[:^ascii:]] is a typo and you meant to write [^[:ascii:]]

Last edited by Scrutinizer; 01-29-2020 at 01:54 AM..
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ASCII(1)						      General Commands Manual							  ASCII(1)

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