awk模式匹配错误的数字

Question

My script does this

ls -1A | awk '/model[1-9]+.dat/' | while read FN

but when I increase model[1-9] to model[1-1000], it doesn't match the files I expect.

Answer 1

when increase model[1-9] to model[1-1000] its taking random number

likes model100.dat, model105.dat. model11.dat ...etc

No, it's not random.

[1-1000] doesn't mean "any number from 1 to 1000". It means a number between 1 and 1, or 0, or 0, or 0. Which is simply 0 or 1. Which is obviously not what you meant.

If you want to look at only the first 1000 files, you can make a pattern that says the file name must have one digit [0-9] , two digits [0-9][0-9] , or three digits [0-9][0-9][0-9] . Put | between each one to mean "or". So it is written ([0-9]|[0-9][0-9]|[0-9][0-9][0-9]) . This means 0-999.

Then you can change your awk part to

awk '/^model([0-9]|[0-9][0-9]|[0-9][0-9][0-9])\.dat$/'

Answer 2

您完全不需要awk，bash括号扩展就足够了。

for filename in model{1..1000}.dat; do ...; done