var1 = abc3559 # 3559 want to get
operating:
var1_key=`echo $var1 | tr -cd "[0-9]"`
var2 = efg010B0C0 #efg is a fixed string, you want to get 010B0C0
operating:
var2_key=`echo $var2 | sed 's/sdk//g'`
shell string variable matches
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Origin www.cnblogs.com/ivyharding/p/11227245.html
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