and 命令
if [ A -a B ]
then
else
fi
set command
set these are parameters
$1
set
strings
str="A is a"
echo "$str"
a=30 b=15
echo `expr a +
b`
echo `expr a -
b`
echo `expr a \*
b`
echo `expr a /
b`
echo `expr a %
b`
The Internal Field Separator
IFS=:
set ":" as field separator S1:S2:...
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原文地址:http://www.cnblogs.com/huashiyiqike/p/3751266.html