bash 如何将字符串附加到同一行而不是创建新行？
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How to append strings to the same line instead of creating a new line?
提问by John Threepwood
Redirection to a file is very usefull to append a string as a new line to a file, like
重定向到文件对于将字符串作为新行附加到文件非常有用，例如
echo "foo" >> file.txt
echo "bar" >> file.txt
Result:
结果：
foo
bar
But is it also possible to redirect a string to the same line in the file ?
但是是否也可以将字符串重定向到文件中的同一行？
Example:
例子：
echo "foo" <redirection-command-for-same-line> file.txt
echo "bar" <redirection-command-for-same-line> file.txt
Result:
结果：
foobar
回答by cnicutar
The newline is added by echo, not by the redirection. Just pass the -nswitch to echoto suppress it:
换行符由echo，而不是由重定向添加。只需通过-n开关echo来抑制它：
echo -n "foo" >> file.txt
echo -n "bar" >> file.txt
-ndo not output the trailing newline
-n不输出尾随换行符
回答by xiphos71
An alternate way to echo results to one line would be to simply assign the results to variables. Example:
将结果回显到一行的另一种方法是简单地将结果分配给变量。例子：
j=$(echo foo)
i=$(echo bar)
echo $j$i
foobar
echo $i $j
bar foo
This is particularly useful when you have more complex functions, maybe a complex 'awk' statement to pull out a particular cell in a row, then pair it with another set.
当您有更复杂的函数时，这特别有用，可能是一个复杂的“awk”语句来连续拉出特定单元格，然后将它与另一个集合配对。
