shell学习笔记（九）
【>】定向输出：将命令输出定向输出到某个文件
用法：
# ls
a dir mailadress maildeliver.sh.20110302154748read.sh wc.sh
case.sh diskinfo maildeliver.sh maildeliver.sh.old systeminfo.sh
content.txtdiskinfo.shmaildeliver.sh.20110302120849mailinfo systeminfo.sh.20110217095558
date.sh ls.sh maildeliver.sh.20110302131831mj.sh systeminfo.sh.bak
# echo ls>a
# cat a
ls
# ls >a
# cat a
a
case.sh
content.txt
date.sh
dir
diskinfo
diskinfo.sh
ls.sh
mailadress
maildeliver.sh
maildeliver.sh.20110302120849
maildeliver.sh.20110302131831
maildeliver.sh.20110302154748
maildeliver.sh.old
mailinfo
mj.sh
read.sh
systeminfo.sh
systeminfo.sh.20110217095558
systeminfo.sh.bak
wc.sh
例子简单了点，为了看明白了。其实还有很多
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