从linux中的行尾删除空格
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remove white space from the end of line in linux
提问by aksg24
i have file in which i want to remove white space from the end of line test.txt is as following (there is white space at the end of line.
我有我想从行尾删除空格的文件 test.txt 如下（行尾有空格。
ath-miRf10005-akr
ath-miRf10018-akr
ath-miRf10019-akr
ath-miRf10020-akr
ath-miRf10023-akr
ath-miRf10024-akr
i used sed 's/$\s//'but it is not working.
我用过，sed 's/$\s//'但它不工作。
采纳答案by fedorqui 'SO stop harming'
Use either a simple blank *or [:blank:]*to remove all possible spaces at the end of the line:
使用简单的空格*或[:blank:]*删除行尾所有可能的空格：
sed 's/ *$//' file
Using the [:blank:]class you are removing spaces and tabs:
使用[:blank:]要删除空格和制表符的类：
sed 's/[[:blank:]]*$//' file
Note this is POSIX, hence compatible in both GNU sed and BSD.
请注意，这是 POSIX，因此在 GNU sed 和 BSD 中都兼容。
For just GNU sed you can use the GNU extension \s*to match spaces and tabs, as described in BaBL86's answer. See POSIX specifications on Basic Regular Expressions.
对于 GNU sed，您可以使用 GNU 扩展\s*来匹配空格和制表符，如BaBL86 的回答中所述。请参阅有关基本正则表达式的POSIX 规范。
Let's test it with a simple file consisting on just lines, two with just spaces and the last one also with tabs:
让我们用一个只包含行的简单文件来测试它，其中两个只有空格，最后一个也有制表符：
$ cat -vet file
hello $
bye $
ha^I $ # there is a tab here
Remove just spaces:
只删除空格：
$ sed 's/ *$//' file | cat -vet -
hello$
bye$
ha^I$ # tab is still here!
Remove spaces and tabs:
删除空格和制表符：
$ sed 's/[[:blank:]]*$//' file | cat -vet -
hello$
bye$
ha$ # tab was removed!
回答by BaBL86
Try this:
尝试这个：
sed -i 's/\s*$//' youfile.txt
回答by NeronLeVelu
sed -i 's/[[:blank:]]\{1,\}$//' YourFile
[:blank:] is for space, tab mainly and {1,} to exclude 'no space at the end' of the substitution process (no big significant impact if line are short and file are small)
[:blank:] 用于空格，主要是制表符，{1,} 用于排除替换过程的“末尾没有空格”（如果行短且文件小，则没有太大的显着影响）
回答by iruvar
If your lines are exactly the way you depict them(no leading or embedded spaces), the following should serve as well
如果您的线条与您描绘它们的方式完全相同（没有前导或嵌入空格），则以下内容也应适用
awk '{=;print}' file.txt
回答by potong
This might work for you (GNU sed):
这可能对你有用（GNU sed）：
sed -ri '/\s+$/s///' file
This looks for whitespace at the end of the line and and if present removes it.
这会在行尾查找空格，如果存在则将其删除。
回答by Kamal
Try using
尝试使用
cat kb.txt | sed -e 's/\s$//g'
