shell基础脚本

#! /bin/bash
echo hello world
echo $PATH
hello=“shixinfa”
echo $hellopath=$(pwd)
files=‘ls-al’
echo current path: $path
echo files: $files
echo “$0”
echo “$1”
echo “$2”
echo “$3"foriin"$*”; do
echo $idoneforiin"$@"; do
echo $i
done
my_array=(A B C D)
echo ${my_array[0]}
echo ${my_array[1]}
echo ${my_array[2]}
var=expr 2 + 3
echo $var
var1=expr 4 - 2
echo $var1
var2=expr 4 / 2
echo $var2if[1-eq2]thenecho"1等于2"elseecho"1不等于2"fia=5b=6result=$[a+b]
echo “$result"forloopin12345doecho"$loop”
done
demofun(){
echo “这个是第一个shell函”
}
demofun