Frantisek Sumsal
5a1355d848
so it can be output as JSON as well.
```
$ build-san/journalctl --list-boots --file boot-test.journal
IDX BOOT ID FIRST ENTRY LAST ENTRY
-3 39d66eb1925f4d01b8464d502650a714 Sat 2022-03-05 15:20:33 CET Sat 2022-03-05 16:19:21 CET
-2 5dffeb08a27344d5ae9e2fc244bbcbc5 Fri 2022-03-11 17:23:57 CET Fri 2022-03-11 17:38:31 CET
-1 c8ebd52915b642c39eda4bf00f864f79 Fri 2022-03-11 17:38:41 CET Fri 2022-03-11 20:03:46 CET
0 00bcba97c7094fa88cc5d1cf2a389057 Sat 2022-03-12 20:39:08 CET Sat 2022-03-12 20:40:18 CET
$ build-san/journalctl --list-boots --file boot-test.journal -q
-3 39d66eb1925f4d01b8464d502650a714 Sat 2022-03-05 15:20:33 CET Sat 2022-03-05 16:19:21 CET
-2 5dffeb08a27344d5ae9e2fc244bbcbc5 Fri 2022-03-11 17:23:57 CET Fri 2022-03-11 17:38:31 CET
-1 c8ebd52915b642c39eda4bf00f864f79 Fri 2022-03-11 17:38:41 CET Fri 2022-03-11 20:03:46 CET
0 00bcba97c7094fa88cc5d1cf2a389057 Sat 2022-03-12 20:39:08 CET Sat 2022-03-12 20:40:18 CET
$ build-san/journalctl --list-boots --file boot-test.journal -o json-pretty
[
{
"index" : -3,
"boot_id" : "39d66eb1925f4d01b8464d502650a714",
"first_entry" : 1646490033438495,
"last_entry" : 1646493561047353
},
{
"index" : -2,
"boot_id" : "5dffeb08a27344d5ae9e2fc244bbcbc5",
"first_entry" : 1647015837289036,
"last_entry" : 1647016711595489
},
{
"index" : -1,
"boot_id" : "c8ebd52915b642c39eda4bf00f864f79",
"first_entry" : 1647016721056382,
"last_entry" : 1647025426397414
},
{
"index" : 0,
"boot_id" : "00bcba97c7094fa88cc5d1cf2a389057",
"first_entry" : 1647113948506002,
"last_entry" : 1647114018943637
}
]
```
Resolves: #14625
System and Service Manager
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