~ $ df -ah
Filesystem      Size  Used Avail Use% Mounted on
rootfs          1.8G  1.6G   98M  95% /
/dev/root       1.8G  1.6G   98M  95% /
devtmpfs        220M     0  220M   0% /dev
tmpfs            44M  200K   44M   1% /run
tmpfs           5.0M     0  5.0M   0% /run/lock
proc               0     0     0    - /proc
sysfs              0     0     0    - /sys
tmpfs            88M     0   88M   0% /run/shm
devpts             0     0     0    - /dev/pts
/dev/mmcblk0p1   56M   17M   40M  30% /boot

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bash: cannot create temp file for here-document: Read-only file system

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dmesg -T

[Wed Jul  9 23:58:37 2014] JBD2: Detected IO errors while flushing file data on mmcblk0p2-8
[Thu Jul 10 00:00:46 2014] JBD2: Detected IO errors while flushing file data on mmcblk0p2-8
[Thu Jul 10 05:18:32 2014] mmc0: Timeout waiting for hardware interrupt - cmd25.
[Thu Jul 10 05:18:32 2014] mmc0: resetting ongoing cmd 25DMA before 4096/4096 [1]/[3] complete
[Thu Jul 10 05:18:33 2014] mmcblk0: error -110 transferring data, sector 1703184, nr 24, cmd response 0x900, card status 0xc00
[Thu Jul 10 05:18:33 2014] mmc0: DMA IRQ 6 ignored - results were reset
[Thu Jul 10 05:18:33 2014] end_request: I/O error, dev mmcblk0, sector 1703190
[Thu Jul 10 05:18:33 2014] end_request: I/O error, dev mmcblk0, sector 1703192
[Thu Jul 10 05:18:33 2014] end_request: I/O error, dev mmcblk0, sector 1703200
[Thu Jul 10 05:18:33 2014] Aborting journal on device mmcblk0p2-8.
[Thu Jul 10 05:18:33 2014] EXT4-fs error (device mmcblk0p2) in ext4_reserve_inode_write:4494: Journal has aborted
[Thu Jul 10 05:18:33 2014] EXT4-fs error (device mmcblk0p2): ext4_journal_start_sb:327: Detected aborted journal
[Thu Jul 10 05:18:33 2014] EXT4-fs error (device mmcblk0p2) in ext4_dirty_inode:4621: Journal has aborted

[Thu Jul 10 05:18:33 2014] EXT4-fs (mmcblk0p2): Remounting filesystem read-only
[Fri Jul 11 05:20:25 2014] EXT4-fs (mmcblk0p2): error count: 4
[Fri Jul 11 05:20:25 2014] EXT4-fs (mmcblk0p2): initial error at 1404962287: ext4_journal_start_sb:327
[Fri Jul 11 05:20:25 2014] EXT4-fs (mmcblk0p2): last error at 1404962287: ext4_dirty_inode:4621