摘要：
$>var=abcabc123 $>echo ${var#*b} cabc123 $>echo ${var##*b} c123 $>echo ${var%b} abcabc123 $>echo ${var%b*} abca $>echo ${var%%b*} a
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摘要：
Introduction In Bash, parameter expansion is a feature that allows you to manipulate the value of a variable or to extract part of its value using a s
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