SHELL编程几个小例子

#/bin/bash
echo "please enter two number"
read a
read b
if test $a -eq $b
then echo "NO.1 = NO.2"
elif test $a -gt $b
then echo "NO.1 > NO.2"
else echo "NO.1 < NO.2"
fi

#/bin/bash
echo "enter a file name:"
read a
if test  -e /root/$a
then echo "the file is exist!"
else echo "the file is not exist!"
fi

#/bin/bash
clear
for num in 1 2 3 4 5 6 7 8 9 10
do
echo "$num"
done

#/bin/bash
echo "Please enter a user:"
read a
b=$(whoami)
if test $a = $b
then echo "the user is running."
else echo "the user is not running."
fi

#/bin/bash
while read line
do
echo $line
done < 0.sh

#/bin/bash
echo "Current User is :"
echo $(ps | grep "$$" | awk '{print $2}')