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从档案中提取数据,并用斜线向目标档案输入数据
原标题:extracting data from a file and appending to the target file in linux using sed

I want to extract some data from files minimumThickness*.k and want to put it in the file results.txt. The file mimimumThickness*.k has only double values in the first line.

档案中最低数量为1至100份。

mimimumThickness1.k
mimimumThickness2.k
mimimumThickness3.k
. . .
. . .
mimimumThickness100.k

我在指挥下这样做,但并非成功。

 sed -n  /^[0-9.]*$/w results.txt  minimumThickness*.k 

我也可以使用

for loop of i over 1 to hundred 

thickness=´cat minimumThickness$i.k | {print $1}   | bc` 
echo $thickness 
thickess >> results.txt

恳请我 problem笑或建议我更妥善地利用ed。 它赞赏任何精彩的方法。

最好。

问题回答

[0-9.]* 将与任何内容相匹配,因此,你可能无法看到预期的结果。 你可以尝试[0-9]*[0-9]* ,以获得双倍(经过一些修改)。

如果你只需要每个档案的第一线:

head -n 1 minimumThickness*.k > results.txt

这可能有助于你们(GNU):

sed -sn  1w results.txt  minimumThickness*.k 

head -qn1 minimumThickness*.k > results.txt




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