刚才一不小心执行了kernel_clean，把辛苦配置的内核.config文件给删除了。
安装恢复工具：
1 | $ sudo apt-get install extundelete |
使用df查看分区的设备文件：
1 2 3 4 5 6 7 8 9 10 11 | $ sudo dfFilesystem 1K-blocks Used Available Use% Mounted onudev 4006212 0 4006212 0% /devtmpfs 805316 9692 795624 2% /run/dev/sda2 14287344 10909076 2629468 81% /tmpfs 4026564 3296 4023268 1% /dev/shmtmpfs 5120 8 5112 1% /run/locktmpfs 4026564 0 4026564 0% /sys/fs/cgroup/dev/sda1 291252 3480 287772 2% /boot/efi/dev/sda3 100541880 41949856 53461684 44% /worktmpfs 805316 80 805236 1% /run/user/1000 |
可以发现设备文件是/dev/sda3
执行恢复命令：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | $ sudo extundelete --recover-file pi/pi3_dev/output/linux-4.14/.config /dev/sda3extundelete: unrecognized option '--recover-file'No action specified; implying --superblock.extundelete: Some unrecognized options were found. Use --help for a usage message.extundelete: Error parsing command-line options.herbert@herbert-pc:/tmp$ sudo extundelete --restore-file pi/pi3_dev/output/linux-4.14/.config /dev/sda3NOTICE: Extended attributes are not restored.WARNING: EXT3_FEATURE_INCOMPAT_RECOVER is set.The partition should be unmounted to undelete any files without further data loss.If the partition is not currently mounted, this message indicates it was improperly unmounted, and you should run fsck before continuing.If you decide to continue, extundelete may overwrite some of the deletedfiles and make recovering those files impossible. You should unmount thefile system and check it with fsck before using extundelete.Would you like to continue? (y/n) y']Loading filesystem metadata ... 781 groups loaded.Loading journal descriptors ... 31454 descriptors loaded.Successfully restored file pi/pi3_dev/output/linux-4.14/.config |
注意：
要恢复的路径是分区中的路径，-o选项指定的路径不能使用绝对路径，是相对于当前目录的路径。
参考
https://blog.csdn.net/dayancn/article/details/54692111
https://blog.csdn.net/liucc09/article/details/51644173