简单的shell编程
学习这么几天了，现在吧我个人觉得还可以的shell脚本与大家分享：比较大小
max.sh
#!/bin/bash
#
[ $1 -gt $2 ] && echo "$1 is the max." ||echo "$2 is the max."
shell运算：c=$[$a+$b] echo $c
ls.sh
#!/bin/bash
if [ -e /etc/issue ]; then
ls -l/etc/issue
fi
user.sh
#!/bin/bash
if cut -d: -f1 /etc/passwd |grep "^$1$" &> /dev/null ; then
echo "$1 is there."
else
echo "$1 is not there."
fi
file.sh
#!/bin/bash
if [ -e $1 ]; then
if [ -f $1 ];then
echo "$1 is a common file."
elif "$1 is a directory."
else
echo "$1 is unkown."
fi
else
echo "You fool,give me a correct file."
exit 7
fi
sum.sh
#!/bin/sh
let SUM=0
for I in $(seq 1 100); do
let SUM+=$I
done
echo "The sum is: $SUM."
ping.sh
#!/bin/bash
for I in {1..10}; do
if ping -c1 -w2 192.168.0.$I &> /dev/null ; then
echo "$I is online."
else
echo "$I is offline."
fi
done
myfile.sh
#!/bin/bash
# cd /var
for I in ./*; do
file $I
done
sum2.sh
#!/bin/bash
echo "Please input an integer:"
read A
echo "Please input an integer:"
read B
echo "sum is $[$A+$B]."
count.sh
#!/bin/bash
read -p "Please assign a file:" FILE
let COUNT=0
while read LINE; do
let COUNT++
done < $FILE
echo $COUNT
发送邮件
post.sh
#!/bin/bash
#
IS_REDHAT=`who |grep redhat`
echo "Please enter the file you want to mail to redhat:"
read FILE
if [ -e $FILE -a -f $FILE ]; then
until [ "$IS_REDHAT"
do
sleep 5
IS_REDHAT=`who |grep redhat`
done
mail -s "Welcome!" redhat
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