【Shell】Ubuntu 基本Shell命令

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/xiaoxiao133/article/details/80174600

#!/bin/bash
string_temp="xiao gong wei"
string_temp_app="my name is ${string_temp}."

### test for string for Shell.
echo ${string_temp_app}
for data_t in ${string_temp} 
do
echo "this is string arrary : ${data_t}."
echo "string length is : ${#data_t}."
done
### test for array
echo "---------------------------------------"
array_name=(1 "xiao" 2 "gong" 3 "wei")
echo ${array_name[0]}
for i in ${array_name[@]}
do
echo "array is: ${i}, the length is : ${#i}/${#array_name[@]}."
done

val=`expr 2 + 3`
echo "number add is : ${val}."


read -p "input number(default 12):" -t 3 x_input

b=12
echo "\$([ ${x_input}==${b} ])"
if [ ${x_input}==${b} ];then 
echo 'True'
else
echo 'False'
fi

for((i=1;i<10;i++))
do
	echo -e "`date +%Y-%m-%d,%H:%M:%S` \n->"
done
echo ""

cd /bin
if test -e ./bash -a -e ./gzip; then
	echo "all files exist."
else
	echo "at least one file defect."
fi

#use while control
i=0
sum=0
n=0
read -p "(1+2+3+...+n),please input n:" n

while test $i -le $n
do
	echo $i
	let sum=sum+i
	let i++
done
echo "1+2+......+${n} = ${sum}"