IF 语句
if condition
then
statements
...
[ elif condition
then
statements
... ]
[ else
statements
... ]
fi
其中“[]”是test命令并不是必须的
if grep foo myfile &> /dev/null;then
for example:
#！/bin/bash
DIR="/tmp"
if test $DIR ; then
echo "This is a directory"
else
echo "This isnot a directory"
fi
上面的例子也可以写成如下：
#！/bin/bash
DIR="/tmp"
if [ -d $DIR ];then
echo "This is a directory"
else
echo "This isnot a directory"
fi
扩展 ：
#！/bin/bash
DIR="/tmp/"
if test -d $DIR ;then
echo "this is a dircetory"
elif test -f $DIR ; then
echo "this is a file"
else
echo "this is neither a directory nor a file"
fi
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