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Top Forums UNIX for Beginners Questions & Answers How to convert any shell command output to JSON format? Post 303040562 by kbrazil on Thursday 31st of October 2019 03:36:23 PM
Old 10-31-2019
jc json conversion tool

I created a tool called jc that converts the output of many command line tools, including df, to json format:

kellyjonbrazil/jc on github.
Code:
$ df | jc --df -p
[
  {
    "filesystem": "udev",
    "1k-blocks": "977500",
    "used": "0",
    "available": "977500",
    "use_percent": "0%",
    "mounted": "/dev"
  },
  {
    "filesystem": "tmpfs",
    "1k-blocks": "201732",
    "used": "1204",
    "available": "200528",
    "use_percent": "1%",
    "mounted": "/run"
  },
  {
    "filesystem": "/dev/sda2",
    "1k-blocks": "20508240",
    "used": "5748312",
    "available": "13695124",
    "use_percent": "30%",
    "mounted": "/"
  },
  {
    "filesystem": "tmpfs",
    "1k-blocks": "1008648",
    "used": "0",
    "available": "1008648",
    "use_percent": "0%",
    "mounted": "/dev/shm"
  }
  ...
]

This User Gave Thanks to kbrazil For This Post:
 

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USTAT(2)						     Linux Programmer's Manual							  USTAT(2)

NAME
ustat - get filesystem statistics SYNOPSIS
#include <sys/types.h> #include <unistd.h> /* libc[45] */ #include <ustat.h> /* glibc2 */ int ustat(dev_t dev, struct ustat *ubuf); DESCRIPTION
ustat() returns information about a mounted filesystem. dev is a device number identifying a device containing a mounted filesystem. ubuf is a pointer to a ustat structure that contains the following members: daddr_t f_tfree; /* Total free blocks */ ino_t f_tinode; /* Number of free inodes */ char f_fname[6]; /* Filsys name */ char f_fpack[6]; /* Filsys pack name */ The last two fields, f_fname and f_fpack, are not implemented and will always be filled with null bytes (''). RETURN VALUE
On success, zero is returned and the ustat structure pointed to by ubuf will be filled in. On error, -1 is returned, and errno is set appropriately. ERRORS
EFAULT ubuf points outside of your accessible address space. EINVAL dev does not refer to a device containing a mounted filesystem. ENOSYS The mounted filesystem referenced by dev does not support this operation, or any version of Linux before 1.3.16. CONFORMING TO
SVr4. NOTES
ustat() is deprecated and has been provided only for compatibility. All new programs should use statfs(2) instead. HP-UX notes The HP-UX version of the ustat structure has an additional field, f_blksize, that is unknown elsewhere. HP-UX warns: For some filesystems, the number of free inodes does not change. Such filesystems will return -1 in the field f_tinode. For some filesystems, inodes are dynam- ically allocated. Such filesystems will return the current number of free inodes. SEE ALSO
stat(2), statfs(2) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. Linux 2017-09-15 USTAT(2)
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