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jsnjzlw
发表于 2018-8-20 08:05:35
shell exec
echo 1234567890 > File # 写字符串到"File".
exec 3 File # 打开"File"并且给它分配fd 3.
read -n 4 &3 # 写一个小数点.
exec 3>&- # 关闭fd 3.
cat File # ==> 1234.67890
http://blog.163.com/xjming487@126/blog/static/212951352009101984030123/
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shell exec