[root@Sailfish nemo]# df -h /
Filesystem            Size  Used Avail Use% Mounted on
/dev/mmcblk0p39       4.6G  1.7G  2.9G  37% /
[root@Sailfish nemo]# dd if=/dev/zero bs=1M count=300 of=tmp
300+0 records in
300+0 records out
314572800 bytes (315 MB) copied, 47.9239 s, 6.6 MB/s
[root@Sailfish nemo]# ls -alh tmp
-rw-r--r-- 1 root root 300M Sep 10 15:14 tmp
[root@Sailfish nemo]# df -h /
Filesystem            Size  Used Avail Use% Mounted on
/dev/mmcblk0p39       4.6G  2.0G  2.6G  44% /
[root@Sailfish nemo]# rm tmp
rm: remove regular file `tmp'? y
[root@Sailfish nemo]# sync
[root@Sailfish nemo]# df -h /
Filesystem            Size  Used Avail Use% Mounted on
/dev/mmcblk0p39       4.6G  2.0G  2.6G  44% /
[root@Sailfish nemo]# ls -alh tmp
ls: cannot access tmp: No such file or directory
[root@Sailfish nemo]# dd if=/dev/zero bs=1M count=1000 of=tmp
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 169.093 s, 6.2 MB/s
[root@Sailfish nemo]# ls -alh tmp
-rw-r--r-- 1 root root 1000M Sep 10 15:18 tmp
[root@Sailfish nemo]# df -h /
Filesystem            Size  Used Avail Use% Mounted on
/dev/mmcblk0p39       4.6G  3.0G  1.7G  65% /
[root@Sailfish nemo]# rm tmp
rm: remove regular file `tmp'? y
[root@Sailfish nemo]# df -h /
Filesystem            Size  Used Avail Use% Mounted on
/dev/mmcblk0p39       4.6G  3.0G  1.7G  65% /
[root@Sailfish nemo]#