Bash 的基本语法规则

1. 函数传参

#!/bin/bash

test_function() {

    echo $1 $2

}

test_function "hello" "world"

Result:

~$ ./example.sh 

hello world

2. 分割字符串

#!/bin/bash

LINE="test_name,test_address,test_phone_number"

name=$(echo $LINE | cut -d ',' -f 1)

address=$(echo $LINE | cut -d ',' -f 2)

phone_number=$(echo $LINE | cut -d ',' -f 3)

echo $name

echo $address

echo $phone_number

Result:

~$ ./example.sh 

test_name

test_address

test_phone_number

3. 读取文件

#!/bin/bash

i=0

SPACE=" "

while read line

do

    echo $i $SPACE $line

    i=$((i+1))

done < test.txt

Result:

~$ cat test.txt

hahaha

haha

ha

~$ ./example.sh 

0 hahaha

1 haha

2 ha

4. 正则表达式匹配

#!/bin/bash

LINE="This is a test string. Let's see if the UUID will be matched: ea77b80d-d17f-476a-b55f-916423d02dcc. Hahaha!"

uuid=$(echo $LINE | grep -E -o '[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}')

echo $uuid

Result:

~$ ./example.sh 

ea77b80d-d17f-476a-b55f-916423d02dcc