将df -h输出成json数组，怎么去掉最后一行的","?

yaoyefengyun

#!/bin/bash

printf "[\n"
df -h | awk 'NR>1 {printf "{\"Filesystem\":\"%s\",\"Size\":\"%s\",\"Used\":\"%s\",\"Avail\":\"%s\"},\n", $1, $2, $3, $4}'
printf "]"

这个脚本会输出类似如下信息：

[
{"Filesystem":"/dev/sda5","Size":"46G","Used":"299M","Avail":"44G"},
{"Filesystem":"udev","Size":"10M","Used":"0","Avail":"10M"},
{"Filesystem":"tmpfs","Size":"774M","Used":"1.1M","Avail":"773M"},
{"Filesystem":"/dev/sda6","Size":"46G","Used":"5.4G","Avail":"38G"},
{"Filesystem":"tmpfs","Size":"1.9G","Used":"160K","Avail":"1.9G"},
{"Filesystem":"tmpfs","Size":"5.0M","Used":"4.0K","Avail":"5.0M"},
{"Filesystem":"tmpfs","Size":"1.9G","Used":"0","Avail":"1.9G"},
{"Filesystem":"/dev/sda7","Size":"28G","Used":"2.7G","Avail":"24G"},
{"Filesystem":"/dev/sda8","Size":"28G","Used":"45M","Avail":"26G"},
{"Filesystem":"/dev/sda1","Size":"453M","Used":"41M","Avail":"386M"},
{"Filesystem":"/dev/sda2","Size":"275G","Used":"47G","Avail":"215G"},
{"Filesystem":"tmpfs","Size":"387M","Used":"8.0K","Avail":"387M"},
{"Filesystem":"tmpfs","Size":"387M","Used":"24K","Avail":"387M"},
]

最后一个{...}行末尾的","该怎么去掉啊？（之前没说清楚，补充下）

================================
最后一行的","该怎么去掉啊

haooooaaa

这东西从哪来的, 你直接去掉?　

yaoyefengyun

我自己写的一个脚本，刚学shell编程，不太会..回复 2# haooooaaa


   

haooooaaa

回复 3# yaoyefengyun


    直接删除?

yaoyefengyun

嗯，直接删除就可以，如果能教教最后一行不显示","的脚本该怎么写就更好了。回复 4# haooooaaa


   

yaoyefengyun

实在抱歉，之前没说清楚，下次提问时我会注意的...回复 6# leijskg


   

haooooaaa

如果这个数据是你脚本生成 的, 你直接 去掉啊,


不是,就 用  gsub("},","}") 类似这样...

yaoyefengyun

好像回复没出来，这样脚本会输出类似这样的数据:

[
{"Filesystem":"/dev/sda5","Size":"46G","Used":"299M","Avail":"44G"},
{"Filesystem":"udev","Size":"10M","Used":"0","Avail":"10M"},
{"Filesystem":"tmpfs","Size":"774M","Used":"1.1M","Avail":"773M"},
{"Filesystem":"/dev/sda6","Size":"46G","Used":"5.4G","Avail":"38G"},
{"Filesystem":"tmpfs","Size":"1.9G","Used":"160K","Avail":"1.9G"},
{"Filesystem":"tmpfs","Size":"5.0M","Used":"4.0K","Avail":"5.0M"},
{"Filesystem":"tmpfs","Size":"1.9G","Used":"0","Avail":"1.9G"},
{"Filesystem":"/dev/sda7","Size":"28G","Used":"2.7G","Avail":"24G"},
{"Filesystem":"/dev/sda8","Size":"28G","Used":"45M","Avail":"26G"},
{"Filesystem":"/dev/sda1","Size":"453M","Used":"41M","Avail":"386M"},
{"Filesystem":"/dev/sda2","Size":"275G","Used":"47G","Avail":"215G"},
{"Filesystem":"tmpfs","Size":"387M","Used":"8.0K","Avail":"387M"},
{"Filesystem":"tmpfs","Size":"387M","Used":"24K","Avail":"387M"},
]

是指最后一个{...}行末尾的","怎么去掉回复 6# leijskg


   

haooooaaa

awk '{sub("},","}")}1'  file  就这样.