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Hi All,

I am writing a block driver for a 2GB SD card where i get the total amount of data per request as follows:


struct request *req;
uint card_addr,total_bytes;
struct request_queue...

The application is written in C. As of now, am redirecting the output to a file and reading it from the file.

Thanks a lot for everyone's inputs..

Hi All,

I have a script(sample.sh) displaying the output of "dd" command. Now i am using this script in system() call as,

system("sh sample.sh") in an application file.

I want the output...

Hi Pludi,

Thanks for ur reply.

sha256sum [OPTION] [FILE] takes just the message as input whereas i need to pass 2 inputs, the message and the key in keyed-hmacsha256 algorithm.

Pls help.
...

Hi all,

I need to calculate MAC value using HMAC-SHA256 algorithm with a message and a key.

Is there any Linux APIs/utilities already exist for HMAC-SHA256?

Thanks,
Amio

Hi All,

Am finding performance of my SD card using hdparm.

Code:
hdparm -tT /dev/BlockDev0

/dev/BlockDev0:
Timing cached reads: 1118 MB in 2.00 seconds = 558.61 MB/sec...

Hi Friends,

My goal is to copy 1000 of files of same filesize simultaneously to a directory. i.e i do multiple copies into a same directory. What i feel here is, at some 1000th iteration, few...

mypid=`ps -w aux | awk '/'"$myvar"'/ && !/awk/ { print $2 }'`
echo PID is $mypid

It also gives the PID using variable subtituition..
Thanks

ps aux | awk '/File$i/ && !/awk/ { print $2 }' & mypid=$!
echo mypid

worked for me..
Thanks

Thanks friends for ur replies.

amio.

Hi All,
Am copying mulitple files in a directory in names File0,File1,File2 etc.
I need to print separately the PID of these copies using File names.


for((i=0;i<5;i++))
do
mypid=`ps aux |...

Hi All,

I am getting the PID of a process using its name using the following command
in a script



mypid=`ps aux | awk '/test5/ && !/awk/ { print $2 }'`
echo PID is $mypid
The problem is...

Any help pls?? :-(

Hi All,
Am using dd command to find throughput of my Normal speed SD card.
After mounting the sd card, i run,


time dd if=/dev/zero of=/mnt/sdcard/Myfile.txt bs=512
count=20480;umount...

Hi All,
Am finding performance of my SD card using hdparm.


hdparm -tT /dev/BlockDev0

/dev/BlockDev0:
Timing cached reads: 1118 MB in 2.00 seconds = 558.61 MB/sec
HDIO_DRIVE_CMD(null)...

Hi Johnson,


temp=$(
{ TIMEFORMAT=%S;time dd if=/dev/zero of=/dev/null bs=512 count=2048 2>/dev/null;sync
} 2>&1 > /dev/null )


gave me the right output.
Thanks a lot. :-)
Amio

Hi Johnson,

Output of

seconds=$( { time dd if=/dev/zero of=/dev/sda1 bs=512 count=2048;sync } 2>&1 > /dev/null )


results in
seconds: 2048+0 records in 2048+0 records out 1048576 bytes...

It shows the time taken, throuput and the real,user seconds for the time command in the prompt..

Franklin,
I tried that also.. It showed sec: dd if=/dev/zero of=/dev/sda1 bs=512 count=2048;sync: No such file or directory.

Just tried by removing single quote also.. it does not print anything...

Hi Franklin,
Sorry, it ended with "Bad File Descriptor"..
Thanks
Amio

Hi Gee-Money,

Thanks for ur reply. It did not work.
I also tried,

sec=$({TIMEFORMAT=%S;time dd if=/dev/zero of=/dev/sda1 bs=512 count=2048;sync;} 2>&1)
echo Seconds: $sec


But the...

Hi All,

I need to store the real seconds of the following command in a variable. How could it be done?



time $(dd if=/dev/zero of=/dev/sda1 bs=512 count=2048;sync)



Thanks,
Amio

Hi all,
Am creating files and doing copy,compare and deletion.
As i do not want to mention the filepath everywhere, i store the filepaths in variables.

FILENAME="/home/test/create/Myfile.txt"...

Hi vgersh99,
Sorry, it is just what u have written. I mistakenly put `.

The output of
filesize=`ls -l test.txt | awk '{print $5}'`
echo File size of test.txt is $filesize bytes >> logfile.txt...

Hi All,

We append the output of a file's size in a file. But a newline character is appended after the variable.
Pls help how to clear this.

filesize=`ls -l test.txt | awk `{print $5}'`
echo...