Shell编程基础
#!/bin/sh变量赋值和引用
#Object Assignment
studentName="leiwuluan";
score=111;
echo "$studentName score is $score";
if 语 句
#shell if...then else
tom="boy";
jierui="girl";
if [ "$tom" = "$jierui" ]; then
echo "tom and jierui sex together!";
else
echo "tom sex=$tom , jierui sex=$jierui, they sex dones't the same";
fi
case 语句
#shell case
flag="3";
case "$flag" in
"1"*)
echo "1";;
"2"*)
echo "2";;
"3"*)
echo "3";;
*)echo "other";;
esac
select 语句
#select
echo "What is your favourite os?";
#select var in "Linux" "Window" "Other" "Leiwuluan";do
# break;
#done
#echo "$var is your favourite os!";
while/for 循环
#while for
for i in a b c d e;do
echo "$i";
done
for i in $*;do
if [ -f "$rpmpackage" ];then
echo "============$rpmpackage==============";
else
echo "=====ERROR:connot read file $rpmpackage"
fi
done
Shell里的一些特殊符号
引号
引号（单引号和双引号）可以防止通配符*的扩展：
Here Document
当要将几行文字传递给一个命令时，用here documents是一种不错的方法。对每个脚本写一段帮助性的文字是很有用的，此时如果使用here documents就不必用echo函数一行行输出。Here document以 << 开头，后面接上一个字符串，这个字符串还必须出现在here document的末尾。下面是一个例子，在该例子中，我们对多个文件进行重命名，并且使用here documents打印帮助：
#!/bin/sh/rm 1.txt 2.txt 3.txtfor i in {01,02,03,04,05};do echo "/home/co_athena/sgh_day_log/allLogs/log1_6.log.2011-09-$i >> 1.txt";cat /home/co_athena/sgh_day_log/allLogs/log1_6.log.2011-09-$i >> 1.txt;donefor i in {09,10,11,12};do echo "/home/co_athena/sgh_day_log/allLogs/log1_6.log.2011-10-$i >> 2.txt";cat /home/co_athena/sgh_day_log/allLogs/log1_6.log.2011-10-$i >> 2.txt;donefor i in {24,25,26,27};do echo "/home/co_athena/sgh_day_log/allLogs/log1_6.log.2011-10-$i >> 3.txt";cat /home/co_athena/sgh_day_log/allLogs/log1_6.log.2011-10-$i >> 3.txt;doneecho "线:31221858 PV UV";cat 1.txt |grep "3802158" |awk -F">adid=" '{print $2}' |awk -F"<[|]>" '{print $1}' |grep -v null |wc -lcat 1.txt |grep "380821858" |awk -F">adid=" '{print $2}' |awk -F"<[|]>" '{print $1}' |grep -v null |sort |uniq |wc -l echo "携程:3732125 PV UV";cat 2.txt |grep "32129415" |awk -F">adid=" '{print $2}' |awk -F"<[|]>" '{print $1}' |grep -v null |wc -lcat 2.txt |grep "372115" |awk -F">adid=" '{print $2}' |awk -F"<[|]>" '{print $1}' |grep -v null |sort |uniq |wc -l echo "网:4455754 PV UV";cat 3.txt |grep "445214" |awk -F">adid=" '{print $2}' |awk -F"<[|]>" '{print $1}' |grep -v null |wc -lcat 3.txt |grep "44553854" |awk -F">adid=" '{print $2}' |awk -F"<[|]>" '{print $1}' |grep -v null |sort |uniq |wc -l
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