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# show version | |
fdupes --version | |
fdupes 2.1.2 | |
# Same size 10G file | |
ls -l | |
合計 20971536 | |
-rw-r--r-- 1 root root 10737422336 2021/05/06_02:44:42 1.dat | |
-rw-r--r-- 1 root root 10737422336 2021/05/06_02:47:10 2.dat | |
# Same for up to 4096 bytes | |
cmp *.dat | |
1.dat 2.dat differ: char 4097, line 1 | |
# clear disk chache | |
echo 3 > /proc/sys/vm/drop_caches | |
# exec | |
time fdupes . | |
real 2m12.252s | |
user 0m44.251s | |
sys 0m12.606s | |
# Create a diff at byte 4096 | |
echo -n "a" | dd of=1.dat bs=1 seek=4095 conv=notrunc | |
echo -n "b" | dd of=2.dat bs=1 seek=4095 conv=notrunc | |
cmp *.dat | |
1.dat 2.dat differ: char 4096, line 1 | |
# clear disk chache | |
echo 3 > /proc/sys/vm/drop_caches | |
# exec | |
time fdupes . | |
real 0m0.224s | |
user 0m0.004s | |
sys 0m0.007s | |
# Fast because there is a difference within 4096 bytes | |
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