分类： Python/Ruby
2011-04-25 22:00:00
问题1：putty中普通用户（除了root之外）在vi编辑器中字体的颜色怎么调的
http://blog.csdn.net/zhongjiekangping/archive/2010/09/03/5861971.aspx
shell句式
条件判断式
①if [ 条件判定一 ]； then
程序段
elif [ 条件判定二 ]； then
程序段
elif [ 条件判定二 ]； then
程序段
else
程序段
fi
注意：中括号里有空格，if和[之间也有空格，‘；’之后也有空格
示例一如下：主要用了if then和for loop、数组。
ifthen-test.sh,至少输入两个参数，根据参数的不同输出不同的结果；
如果少于2个参数，输出“short of parameter”;
如果大于等于2个参数：
前两个参数为moon和tree,输出:03grade:+所有输入参数 ;
前两个参数为golden和flower,输出：04grade:+所有输入参数；
前两个参数不是case1和case2，那么输出：not grade
#!/bin/bash
#Function:practise if then
#Date:2011 04 21
#Version:1.0.0.0
LANG=C
export LANG
declare -i intnum=$#
declare -a var[10]
declare result=""
if [ $intnum -lt 2 ]; then
echo "short of parameter"
else
for (( b=1; b<=$intnum; b=b+1 ))
do
eval var[$b]=\$$b
result="$result${var[$b]} "
done
if [ "${var[1]}" == "moon" ] && [ "${var[2]}" == "tree" ]; then
echo "03grade: $result"
elif [ "${var[1]}" == "golden" ] && [ "${var[2]}" == "flower" ]; then
echo "04grade: $result"
else
echo "not grade"
fi
fi
echo "output successfully!"
exit 0
运行结果如下：
示例二如下：
port-test.sh
#！/bin/bash
#Function:using "if then" to show host's service.
#Date:2011 04 21
#Version:1.0.0.0
#1.print the program's work
echo "Now,the service of your linux system will be detect!"
echo "the www,ftp,ssh, and send mail+pop3 will be detect!"
echo " "
#2.www
www='netstat -an|grep LISTEN|grep :80'
if [ "$www" != ""]; then
echo "WWW is running"
else
echo "WWW is NOT running"
fi
#3.ftp
ftp='netstat -an|grep LISTEN|grep :21'
if [ "$ftp" != ""]; then
echo "FTP is running"
else
echo "FTP is NOT running"
fi
#4.ssh
ssh='netstat -an|grep LISTEN|grep :22'
if [ "$ssh" != ""]; then
echo " SSH is running"
else
echo "SSH is NOT running"
fi
#5.smtp+pop3
smtp='netstat -an|grep LISTEN|grep :25'
pop3='netstat -an|grep LISTEN|grep :110'
if [ "$smtp" != "" ] && [ "$pop3" != "" ]; then
echo "sendmail is OK!"
elif [ "$smtp" != "" ] && [ "$pop3" == "" ]; then
echo "sendmail have some proplems of your pop3!"
elif [ "$smtp" == ""] && [ "$pop3" != "" ]; then
echo "sendmail have some proplems of your SMTP!"
else
echo "sendmail is not running!"
fi
运行结果：
②case句式：基本语法如下
case $变量名称 in “第一个变量内容”） 程序段 ；； “第二个变量内容”） 程序段 ；； “第三个变量内容”） 程序段 ；； …… …… *） 程序段 ；； esac
示例如下：case-test.sh
只能输入1个参数，否则输出"too more parameters"
参数是Ruying，那么输出05；
参数是moontree，那么输出03；
参数是goldenflower，那么输出04； 都不是，就输出not known。 源码：
#!/bin/bash
#Function:practise usage of case
#Date:2011 04 21
#Version:1.0.0.0
declare -i a=$#
if [ $a -gt 1 ]; then
echo "too more parameters"
else
case $1 in
"Ruying")
echo "05"
;;
"moontree")
echo "03"
;;
"goldenflower")
echo "04"
;;
*)
echo "not known"
;;
esac
fi
exit 0
运行结果：
③for循环(还有while until等不定循环，用法大同小异）
示例一：forlist-test.sh
#!/bin/bash
#Function:pratise the usage of " for loop " limited 10
#Date:2011 04 21
#Version:1.0.0.0
#fuction begin
for animal in dog cat elephant monkey horse duck bear
do
echo "there are ${animal}s in the zoo"
done
exit 0
运行结果如下：
示例二：输入一个数字 计算阶乘，当然有不够严谨的地方，自己练习，随便写写。
for-n-test.sh
#!/bin/bash
#Function:practise the usage of "for loop" unlimited
#Date:2011 04 21
#Version:1.0.0.0
#1.deal parameters
declare -i count=$#
if [ $count -gt 1 ]; then
echo "too more parameters!"
else
declare -i n=$1
declare -i result=1;
for j in $(seq 1 $n)
do
result=$result*j
done
echo $result
fi
运行结果如下：
④read：从键盘读取数据，赋给变量。
示例一：
read-test.sh
#!/bin/bash
#Funtion:practise read values for keyb
#Date:2011 04 21
#Version:1.0.0.0
#tips for uses to input
echo "please enter your name and then press ENTER:"
read name
#print the key in data
echo "this is your name that you key in :" $name
exit 0
运行结果如下：
示例二
⑤declare用法：用declare声明出整型变量，后面的字符串就会计算。
示例：
declare-test
#!/bin/bash
#Function:for practise "declare"
#Date:2011 04 21
#Version:1.0.0.0
number1=2*3*4*5+90+21
declare -i number2=2*3*4*5+90+21
echo "the result of number1: $number1"
echo "the result of number1: $number2"
exit 0
示例二
示例三
⑥shell下如何处理接收参数呢？
示例：parameter-test.sh
#!/bin/bash
#Function:practise how the program define what are parameters
#Date:2011 04 21
#Version:1.0.0.0
echo "the scripts'name is: $0"
echo "the parameters are: $1 $2 $3"
exit 0
运行结果如下：
