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sed 例如：“1”到“01”-怎么做？

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sed 例如：“1”到“01”-怎么做？

如果有人能写出更好的主题，那么我会很高兴：D

INPUT:
201103 1 /mnt/hdd/PUB/SOMETHING
201102 7 /mnt/hdd/PUB/SOMETH ING
201103 11 /mnt/hdd/PUB/SO METHING
201104 3 /mnt/hdd/PUB/SOMET HING
201106 1 /mnt/hdd/PUB/SOMETHI NG

I NEED THIS OUTPUT:
201103 01 /mnt/hdd/PUB/SOMETHING
201102 07 /mnt/hdd/PUB/SOMETH ING
201103 11 /mnt/hdd/PUB/SO METHING
201104 03 /mnt/hdd/PUB/SOMET HING
201106 01 /mnt/hdd/PUB/SOMETHI NG

如果“天”部分只有“1”，我该如何添加“0”？[我需要的日期格式是：YYYYMM DD]

答案1

您可以尝试例如这个：

sed -r 's/^([0-9]{6}\s)([0-9]\s)/\10\2/'

答案2

$ sed 's/\(\<[0-9]\>\)/0\1/' ./infile
201103 01 /mnt/hdd/PUB/SOMETHING
201102 07 /mnt/hdd/PUB/SOMETH ING
201103 11 /mnt/hdd/PUB/SO METHING
201104 03 /mnt/hdd/PUB/SOMET HING
201106 01 /mnt/hdd/PUB/SOMETHI NG

https://unix.stackexchange.com/questions/9137/sed-eg-1-to-01-how

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