How to remove the special characters shown as blue color in the picture 1 like: ^M, ^A, ^@, ^[. In my understanding, ^M is a windows newline character, I can use
sed -i '/^M//g'
to remove it, but it doesn't work to remove others. The command dos2unix
doesn't work, neither. Are there exist any ways that I can use to remove them both?
Remove everything except the printable characters (character class [:print:]
), with sed
:
sed $'s/[^[:print:]\t]//g' file.txt
[:print:]
includes:
[:alnum:]
(alpha-numerics) [:punct:]
(punctuations) The ANSI C quoting ( $''
) is used for interpreting \\t
as literal tab inside $''
(in bash
and alike).
要确保命令在Sed中使用有限的范围,强制使用“C”(POSIX)字符分类以避免使用非ASCII字符的不可预测的行为:
LC_ALL=C sed 's/[^[:blank:][:print:]]//g' file.txt
Try running below command on linux command prompt
Option - 1: (If dos2unix command is installed on Linux machine)
dos2unix sample_file.txt
Option - 2:
cat sample_file.txt | tr -d '\015' > new_sample_file.txt
Try this inside vi or vim:
or:
sed -e "s/^M//" filename > newfilename
Important : To enter ^M, type CTRL-V, then CTRL-M
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.