Shell脚本备忘录

yum -y install jq

[{ 
   
	"name": "站长工具",
	"url": "http://tool.chinaz.com",
	"address": { 
   
		"city": "厦门",
		"country": "中国"
	},
	"arrayBrowser": [{ 
   
		"name": "Google",
		"url": "http://www.google.com"
	}, { 
   
		"name": "Baidu",
		"url": "http://www.baidu.com"
	}]
}, { 
   
	"name": "站长之家",
	"url": "http://tool.zzhome.com",
	"address": { 
   
		"city": "大连",
		"country": "中国"
	},
	"arrayBrowser": [{ 
   
		"name": "360",
		"url": "http://www.so.com"
	}, { 
   
		"name": "bing",
		"url": "http://www.bing.com"
	}]
}]

cat json.txt | jq '.[0]'

cat json.txt | jq '.[0].name'

cat json.txt | jq '.[0] | {name:.name, city:.address.city}'

cat json.txt | jq '.[] | {name:.name, city:.address.city}'

cat json.txt | jq '.[0] | {name:.name, url: .arrayBrowser[1].url}'

cat json.txt | jq '[.[] | {name:.name, city:.address.city}]'

cat json.txt | jq '[.[] | {name2:.name, city2:.address.city}]'

[root@localhost testShell]# echo 111 > 1.sh
[root@localhost testShell]# rm 2.sh
rm: cannot remove ‘2.sh’: No such file or directory
[root@localhost testShell]# echo $?
1
[root@localhost testShell]# rm 1.sh 
rm: remove regular file ‘1.sh’? y
[root@localhost testShell]# echo $?
0

[root@localhost testShell]# echo $(date)
Tue Aug 17 06:50:29 EDT 2021

[root@localhost testShell]# echo $$
80329

[root@localhost testShell]# echo 'ping www.baidu.com' > ping.sh
[root@localhost testShell]# tail -f ping.sh &
[1] 88991
[root@localhost testShell]# echo $!
88991
[root@localhost testShell]# kill $!
[root@localhost testShell]# echo $!
88991
[1]+  Terminated              tail -f ping.sh

[root@localhost testShell]# echo $-
himBH

echo "内容" | sed 's/\"//g'

set -x

[root@localhost testShell]# url=www.baiud.com
[root@localhost testShell]# echo ${net/baidu/google}
www.google.com
[root@localhost testShell]# echo ${net//./-}
www-baidu-com
[root@localhost testShell]# echo ${net/./-}
www-baidu.com

[root@localhost testShell]# url=www.baiud.com
[root@localhost testShell]# echo ${url#*www.}
baidu.com
[root@localhost testShell]# echo ${url%*.com}
www.baidu