tekk555

mount -t tmpfs -o size=64m tmpfs /dev/shm
mount -t tmpfs -o size=64m /dev/shm /var/tmp

# root user

tekk555

sort -R list.txt

tekk555

find /var/tmp -type f

tekk555

find /var/tmp -type f -exec ls -i {} \;

tekk555

# 100 byte 
dd if=/dev/urandom of=/var/100byte.dat count=100 bs=1;

# 150 kbyte
dd if=/dev/urandom of=/var/150kbyte.dat count=150 bs=1k;

tekk555

#!/bin/sh

for i in `seq 1 25`; do
  dd if=/dev/urandom of=/var/temp/$i.dat count=180 bs=1k;
done;

tekk555

shutdown -r now
shutdown -h now

# root user

tekk555

long t1 = System.nanoTime();
long t2 = System.nanoTime();
System.out.println(t2-t1);

tekk555

sync
sysctl -w vm.drop_caches=1
sysctl -w vm.drop_caches=2
sysctl -w vm.drop_caches=3
hdparm -f /dev/vda

tekk555

CREATE TABLE TEST(
    DATA_ID INTEGER,
    DATA_AREA BLOB,
    CONSTRAINT TEST_PKEY PRIMARY KEY (DATA_ID)
);


echo "insert into test(DATA_ID, DATA_AREA) values(1,x'"$(hexdump -v -e '1/1 "%02x"' bin.dat)"');"