[问题求助] gawk如何匹配纯字母的行

@echo off
gawk "$0~/[a-z]/{print $0}" a.txt>con
pause
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buffer: /
buffer: a
/aadfasdhus
buffer: /
buffer: a
/af23456dfidf
buffer: /
buffer: 3
buffer: 5
buffer: 6
buffer: 7
buffer: 2
buffer: /
buffer: 5
buffer: 7
buffer: 6
buffer: 7
buffer: d
dfdhfe
buffer: /
buffer: z
/zdfdf555dfi
buffer: /
buffer: a
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/aadfasdhus
/af23456dfidf
/35672
/5767
dfdhfe
/zdfdf555dfi
/adf782dfi
/zd你好df
/dfi阿dfi
/78923好456
/好的123
/abc好123
/123好zzz
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