Shell脚本应该怎么使用？

#!/bin/bashecho "Hello World"

1. cd 到该目录下2. chmod +x ./test.sh  #给脚本权限3. ./test.sh  #执行脚本

myText="hello world"muNum=100

myText="hello world"muNum=100echo $myTextecho muNum

#!/bin/bashecho "Hello World !"a=3b=5val=`expr $a + $b`echo "Total value : $val"val=`expr $a - $b`echo "Total value : $val"val=`expr $a \* $b`echo "Total value : $val"val=`expr $a / $b`echo "Total value : $val"

a=3b=5val=`expr $a / $b`echo "Total value : $val"val=`expr $a % $b`echo "Total value : $val"if [ $a == $b ]then
   echo "a is equal to b"fiif [ $a != $b ]then
   echo "a is not equal to b"fi

a=10b=20if [ $a -eq $b ]then
   echo "true"else
   echo "false"fiif [ $a -ne $b ]then
   echo "true"else
   echo "false"fiif [ $a -gt $b ]then
   echo "true"else
   echo "false"fiif [ $a -lt $b ]then
   echo "true"else
   echo "false"fiif [ $a -ge $b ]then
   echo "true"else
   echo "false"fiif [ $a -le $b ]then
   echo "true"else
   echo "false"fi

#!/bin/shmtext="hello"  #定义字符串
mtext2="world"mtext3=$mtext" "$mtext2  #字符串的拼接echo $mtext3  #输出字符串echo ${#mtext3}  #输出字符串长度echo ${mtext3:1:4}  #截取字符串

#!/bin/sharray=(1 2 3 4 5)  #定义数组
array2=(aa bb cc dd ee)  #定义数组
value=${array[3]}  #找到某一个下标的数，然后赋值echo $value  #打印
value2=${array2[3]}  #找到某一个下标的数，然后赋值echo $value2  #打印
length=${#array[*]}  #获取数组长度echo $length

#!/bin/shecho "hello world"  echo hello world  

text="hello world"echo $textecho -e "hello \nworld"  #输出并且换行echo "hello world" > a.txt  #重定向到文件echo `date`  #输出当前系统时间

#!/bin/sha=10b=20if [ $a == $b ]then
   echo "true"fiif [ $a == $b ]then
   echo "true"else
   echo "false"fiif [ $a == $b ]then
   echo "a is equal to b"elif [ $a -gt $b ]then
   echo "a is greater than b"elif [ $a -lt $b ]then
   echo "a is less than b"else
   echo "None of the condition met"fi

test $[num1] -eq $[num2]  #判断两个变量是否相等
test num1=num2  #判断两个数字是否相等

#!/bin/shfor i in {1..5}doecho $idonefor i in 5 6 7 8 9doecho $idonefor FILE in $HOME/.bash*do
   echo $FILEdone

#!/bin/shCOUNTER=0while [ $COUNTER -lt 5 ]doCOUNTER=`expr $COUNTER + 1`echo $COUNTERdoneecho '请输入。。。'echo 'ctrl + d 即可停止该程序'while read FILMdoecho "Yeah! great film the $FILM"done

break  #跳出所有循环
break n  #跳出第n层f循环
continue  #跳出当前循环

#!/bin/shsysout(){echo "hello world"}

sysout

#!/bin/shtest(){

    aNum=3anotherNum=5return $(($aNum+$anotherNum))
}
test
result=$?echo $result

#!/bin/shtest(){echo $1  #接收第一个参数echo $2  #接收第二个参数echo $3  #接收第三个参数echo $#  #接收到参数的个数echo $*  #接收到的所有参数
}

test aa bb cc

$echo result > file  #将结果写入文件，结果不会在控制台展示，而是在文件中，覆盖写
$echo result >> file  #将结果写入文件，结果不会在控制台展示，而是在文件中，追加写echo input < file  #获取输入流

#!/bin/bashecho "-------Begin-------"git add .
git commit -m $1echo $1git push origin masterecho "--------End--------"