shell同时读取多个文件合并

现有多个文本文件想要合并在一起,以两个文件为例子吧:

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#fileA.txt
this is File A line1
this is File A line2
this is File A line3
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#fileB.txt
this is File B line1
this is File B line2
this is File B line3

想要实现交叉的合并,合并后结果为:

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this is File A line1
this is File B line1
this is File A line2
this is File B line2
this is File A line3
this is File B line3


command1:

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paste $fileA $fileB |tr "\t" "\n" > newfile

command2:

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awk '{getline line < "fileB.txt";print $0;print line}' fileA.txt