shell字符串处理
1.待实践
http://www.blogjava.net/Man/archive/2012/02/07/369504.html
http://blog.csdn.net/dao123mao/article/details/5339201
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2.cut
echo "1/2/3/4" | cut -d"/" -f1 ? =》1
echo "1/2/3/4" | cut -d"/" -f1,3 ? =》1/3
echo "1/2/3/4/5/6/7" | cut -d"/" -f1-2,5-7 ? =》1/2/ ?+ ?5/6/7
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3.
cut -c[rang1],[rang2]
cut -b[rang]
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rang:
5 ? :第5个
5- ?:第5个到最后一个
-5 ?:1-5
5-9 :5-9
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