Linux Bash：将字符串添加到文件末尾而不换行
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原文地址: http://stackoverflow.com/questions/8739427/
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Bash: add string to the end of the file without line break
提问by Crazy_Bash
How can I add string to the end of the file without line break?
如何在不换行的情况下将字符串添加到文件末尾？
for example if i'm using >> it will add to the end of the file with line break:
例如，如果我使用 >> 它将添加到带有换行符的文件末尾：
cat list.txt
yourText1
root@host-37:/# echo yourText2 >> list.txt
root@host-37:/# cat list.txt
yourText1
yourText2
I would like to add yourText2 right after yourText1
我想在 yourText1 之后添加 yourText2
root@host-37:/# cat list.txt
yourText1yourText2
采纳答案by Dimitre Radoulov
sed '$s/$/yourText2/' list.txt > _list.txt_ && mv -- _list.txt_ list.txt
If your sedimplementation supports the -ioption, you could use:
如果您的sed实现支持-i选项，您可以使用：
sed -i.bck '$s/$/yourText2/' list.txt
With the second solution you'll have a backup too (with first you'll need to do it manually).
使用第二个解决方案，您也将有一个备份（首先您需要手动完成）。
Alternatively:
或者：
ex -sc 's/$/yourText2/|w|q' list.txt
or
或者
perl -i.bck -pe's/$/yourText2/ if eof' list.txt
回答by Franz
You can use the -n parameter of echo. Like this:
您可以使用 echo 的 -n 参数。像这样：
$ touch a.txt
$ echo -n "A" >> a.txt
$ echo -n "B" >> a.txt
$ echo -n "C" >> a.txt
$ cat a.txt
ABC
EDIT: Aha, you already had a file containing string and newline. Well, I'll leave this here anyway, might we useful for someone.
编辑：啊哈，你已经有一个包含字符串和换行符的文件。好吧，无论如何我都会把它留在这里，我们可能对某人有用。
回答by fedorqui 'SO stop harming'
Just use printfinstead, since it does not print the new line as default:
只需使用printf，因为它不会默认打印新行：
printf "final line" >> file
Test
测试
Let's create a file and then add an extra line without a trailing new line. Note I use cat -vetto see the new lines.
让我们创建一个文件，然后添加一个没有尾随新行的额外行。注意我cat -vet用来查看新行。
$ seq 2 > file
$ cat -vet file
1$
2$
$ printf "the end" >> file
$ cat -vet file
1$
2$
the end
回答by Will Charlton
The above answers didn't work for me. Posting a Python implementation in case anyone finds it useful.
以上答案对我不起作用。发布一个 Python 实现，以防有人觉得它有用。
python -c "txtfile = '/my/file.txt' ; f = open(txtfile, 'r') ; d = f.read().strip() ; f.close() ; d = d + 'the data to append' ; open(txtfile, 'w').write(d)"
