Linux 如何使用 sed 替换退格字符 (\b)?
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How do I replace backspace characters (\b) using sed?
提问by Thiago de Arruda
I want to delete a fixed number of some backspace characters ocurrences ( \b ) from stdin. So far I have tried this:
我想从标准输入中删除固定数量的退格字符( \b )。到目前为止,我已经尝试过这个:
echo -e "1234\b\b\b56" | sed 's/\b{3}//'
But it doesn't work. How can I achieve this using sed or some other unix shell tool?
但它不起作用。如何使用 sed 或其他一些 unix shell 工具来实现这一点?
采纳答案by mkb
sed interprets \b
as a word boundary. I got this to work in perl like so:
sed 解释\b
为单词边界。我让它在 perl 中工作,如下所示:
echo -e "1234\b\b\b56" | perl -pe '$b="\b";s/$b//g'
回答by Eugene Yarmash
You can use tr
:
您可以使用tr
:
echo -e "1234\b\b\b56" | tr -d '\b'
123456
If you want to delete three consecutive backspaces, you can use Perl:
如果要删除三个连续的退格,可以使用Perl:
echo -e "1234\b\b\b56" | perl -pe 's/(0){3}//'
回答by wkl
With sed:
使用 sed:
echo "123\b\b\b5" | sed 's/[\b]\{3\}//g'
echo "123\b\b\b5" | sed 's/[\b]\{3\}//g'
You have to escape the {
and }
in the {3}
, and also treat the \b
special by using a character class.
你必须逃脱{
,并}
在{3}
,而且治疗\b
通过使用字符类特殊。
[birryree@lilun ~]$ echo "123\b\b\b5" | sed 's/[\b]\{3\}//g'
1235
回答by Jon Nalley
You can use the hexadecimal value for backspace:
您可以使用十六进制值作为退格键:
echo -e "1234\b\b\b56" | sed 's/\x08\{3\}//'
You also need to escape the braces.
您还需要转义大括号。
回答by pixelbeat
Note if you want to remove the characters being deleted also, have a look at ansi2html.shwhich contains processing like:
请注意,如果您还想删除被删除的字符,请查看ansi2html.sh,其中包含如下处理:
printf "12..\b\b34\n" | sed ':s; s#[^\x08]\x08##g; t s'
回答by gutti
No need for Perl here!
这里不需要 Perl!
# version 1
echo -e "1234\b\b\b56" | sed $'s/\b\{3\}//' | od -c
# version 2
bvar="$(printf '%b' '\b')"
echo -e "1234\b\b\b56" | sed 's/'${bvar}'\{3\}//' | od -c