在 bash 中仅获取部分字符串的最简单方法
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Easiest way to get only part of a string in bash
提问by Alfred
I like to listen to sky.fm and I use curl to query media information
喜欢听sky.fm，用curl查询媒体信息
What I use right now is:
我现在使用的是：
curl -s curl http://127.0.0.1:8080/requests/status.json | grep now_playing
This returns:
这将返回：
"now_playing":"Cody Simpson - On My Mind"
What I would like to have is:
我想要的是：
Cody Simpson - On My Mind
Maybe even better, put the artist and title in separate variables.
也许更好，将艺术家和标题放在不同的变量中。
artist: Cody Simpson
title: On My mind
Solution
解决方案
#!/bin/bash
a=`curl -s http://127.0.0.1:8080/requests/status.json | grep -Po '(?<=now_playing":")[^"]+'`
artist=$(echo $a | awk -F' - ' '{print }')
title=$(echo $a | awk -F' - ' '{print }')
echo $artist
echo $title
采纳答案by ktm5124
You can do this using cut.
您可以使用 cut 来做到这一点。
curl -s http://127.0.0.1:8080/requests/status.json | \
grep 'now_playing' | cut -d : -f 2 | sed 's/"//g'
The cut command helps you select fields. The fields are defined by a delimiter, in this case ':'. The -doption specifies the delimiter, the -foption specifies the fields we want to select.
剪切命令可帮助您选择字段。字段由分隔符定义，在本例中为':'。该-d选项指定的分隔符，该-f选项指定，我们要选择的领域。
The sed part is simply to remove the quotes.
sed 部分只是删除引号。
回答by Chris Seymour
A simpler approach if you have GNU grep:
如果您有一个更简单的方法GNU grep：
curl ... | grep -Po '(?<=now_playing":")[^"]+'
Cody Simpson - On My Mind
Where curl ...is replaced by your actual curlcommand.
Wherecurl ...由您的实际curl命令替换。
Edit:
编辑：
I'd go with awkfor your second request:
我会同意awk你的第二个要求：
curl ... | awk -F'"' '{split(,a," - ");print "artist:",a[1],"\ntitle:",a[2]}'
artist: Cody Simpson
title: On My Mind
To store in shell variables:
要存储在 shell 变量中：
artist=$(curl ... | awk -F'"' '{split(,a," - ");print a[1]}')
echo "$artist"
Cody Simpson
title=$(curl ... | awk -F'"' '{split(,a," - ");print a[2]}')
echo "$title"
On My Mind
回答by eminor
with sed:
与 sed：
curl -s 'http://127.0.0.1:8080/requests/status.json' | \
sed '/now_playing/s/^\"now_playing\":"\(.*\)"$//'
with grep, cut and tr:
使用 grep、cut 和 tr：
curl -s 'http://127.0.0.1:8080/requests/status.json' | \
grep now_playing | cut -d':' -f2 | tr -d '"'
with awk:
使用 awk：
curl -s 'http://127.0.0.1:8080/requests/status.json' | \
awk -F':' '/now_playing/ {gsub(/"/,""); print }'
