What I am trying to execute from my bash script:
redis-cli srem myset "abc\x06def"
\x06 part seems to be ignored.
OS is Ubuntu 14.04 LTS and LANG=en_US.UTF-8, if these have anything to do with the problem.
With bash I suggest:
redis-cli srem myset "abc"$'\x06'"def"
For checking the existence:
echo "abc"$'\x06'"def" | hexdump -C
Output:
00000000 61 62 63 06 64 65 66 0a |abc.def.|
00000008
Related
I was following some instructions on the OSSEC site on how to install it on CentOS.
# wget -q -O – https://www.atomicorp.com/installers/atomic | sh
# yum install ossec-hids ossec-hids-server (or ossec-hids-client for the agent)
After I ran the first command, I noticed a file named - appear in my folder. The second command doesn't work as Yum says it can't find the package. But now this strange file - can't be removed. It is actually a pointer to stdout.
Can anyone help please get rid of it? Thanks
This is happening because the dash (-) you have used in not the regular - used to indicate STDOUT:
% printf '–' | hexdump -C
00000000 e2 80 93 |...|
00000003
% printf '\xe2\x80\x93\n'
–
Regular -:
% printf '-' | hexdump -C
00000000 2d |-|
00000001
% printf '\x2d\n'
-
So you need to use regular - to indicate STDOUT for saving the content.
To remove the created file, use Hex value:
rm -- $'\xe2\x80\x93'
I want to figure out the configuration that allows me to detect the new UUID of a beacon when it changes in the shortest time. I use this code in my Raspberry Pi to start the beacon
sudo hciconfig hci0 reset
sudo hciconfig hci0 up
sudo hcitool -i hci0 cmd 0x08 0x0008 1e 02 01 1a 1a ff 4c 00 02 15 e2 c5 6d b5 $
sudo hcitool -i hci0 cmd 0x08 0x0006 A0 00 A0 00 03 00 00 00 00 00 00 00 00 07 $
sudo hcitool -i hci0 cmd 0x08 0x000a 01
then I change the UUID and mesure the time needed for the mobile device to detect the change. Until know the average is 800 ms with 10hz of transmission rate.
Do you have an idea if it's possible to make a shorter time ?
To get a faster detection time, you can decrease the scan period, using code like below. You can experiment with the exact timing, but given a transmission period of 100 ms, I suspect you might get the fastest response with a period like 200 ms as shown below.
beaconManager.setForegroundScanPeriod(200l);
beaconManager.updateScanPeriods();
I am getting following error while trying to upload to s3. The script below seems to be correct but still I get above error. Please can someone help me in solving this error. My secret key and access ID are correct as I am able to connect to AWS using these keys in java and ruby.
<?xml version="1.0" encoding="UTF-8"?>
<Error><Code>SignatureDoesNotMatch</Code><Message>The request signature we calculated does not match the signature you provided. Check your key and signing method.</Message><AWSAccessKeyId>AKIAJNODAIRHFUX3LHFQ</AWSAccessKeyId><StringToSign>PUT
application/x-compressed-tar
Sun, 20 Dec 2015 19:54:47 -0500
/test-pk-proj//home/rushi/pk.tar.gz</StringToSign><SignatureProvided>M1PcN+Umkq5WFtVVSerHRGNABb8=</SignatureProvided><StringToSignBytes>50 55 54 0a 0a 61 70 70 6c 69 63 61 74 69 6f 6e 2f 78 2d 63 6f 6d 70 72 65 73 73 65 64 2d 74 61 72 0a 53 75 6e 2c 20 32 30 20 44 65 63 20 32 30 31 35 20 31 39 3a 35 34 3a 34 37 20 2d 30 35 30 30 0a 2f 74 65 73 74 2d 70 6b 2d 70 72 6f 6a 2f 2f 68 6f 6d 65 2f 72 75 73 68 69 2f 70 6b 2e 74 61 72 2e 67 7a</StringToSignBytes><RequestId>5439C7C84533E7C6</RequestId><HostId>620896ul+wnRwCjWl1ZtNZQ5NEJMGl29FqESC3iJyvnWhYhOECLlPl0417RfF3eovKFb7ac2.amazonaws.com port 443: Connection timed out
Below is my shell script which I am using to upload data to s3
file=/home/rushi/1.pdf
bucket=xxxxxxxxxxxxxxxxxxx
resource="/${bucket}/${file}"
contentType="application/x-compressed-tar"
dateValue=`date -R`
stringToSign="PUT\n\n${contentType}\n${dateValue}\n${resource}"
s3Key=xxxxxxxxxxxxxxxxxxxxxxxxxxx
s3Secret=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
signature=`echo -en ${stringToSign} | openssl sha1 -hmac ${s3Secret} -binary | base64`
curl -L -X PUT -T "${file}" \
-H "Host: ${bucket}.s3-website-us-west-2.amazonaws.com" \
-H "Date: ${dateValue}" \
-H "Content-Type: ${contentType}" \
-H "Authorization: AWS ${s3Key}:${signature}" \
https://${bucket}.s3-website-us-west-2.amazonaws.com/${file}
Install AWS CLI from link given below
Configure AWS by aws configure command and enter keys and region
To copy file to S3 use this command in shell script
aws s3 cp fileName s3://bucketName
Link: http://docs.aws.amazon.com/cli/latest/userguide/installing.html#install-bundle-other-os
p.s If you receive connection timed out error open port 443 (HTTPS) in security group.
Please follow the below steps,
Create one IAM user with the permission to upload files in s3 bucket.
Note: You can also create a policy where you can access all the s3 buckets available in your region and you can attach the policy to the user that u have created in IAM for uploading files in S3 bucket
Make a note of your access and secret key for the IAM user.
Login in to your server for example [Aws linux server]
use the following command
aws configure
enter the access key
enter the secret key
enter the region for example if it is mumbau region use ap-south-1
enter the output as "text"
after this you are ready to upload files from your server to s3 bucket.
use the example command for uploading files in s3 bucket
aws s3 cp or mv fileName s3://bucketName
The above aws cli can be used in script for uploading files.
I want to generate System.map from vmlinuz,cause most of machines don't have the file System.map.In fact,vmlinuz are compressed to vmlinuz or bzImage.
It's any tool or script can do this?
I tried:
dd if=/boot/vmlinuz skip=`grep -a -b -o -m 1 -e $'\x1f\x8b\x08\x00' /boot/vmlinuz | cut -d: -f 1` bs=1 | zcat > /tmp/vmlinux
It was failed:
zcat: stdin: not in gzip format
32769+0 records in
32768+0 records out
To extract the uncompressed kernel from the kernel image, you can use the extract-vmlinux script from the scripts directory in the kernel tree (available at least in kernel version 3.5) (if you get an error like
mktemp: Cannot create temp file /tmp/vmlinux-XXX: Invalid argument
you need to replace $(mktemp /tmp/vmlinux-XXX) by $(mktemp /tmp/vmlinux-XXXXXX) in the script). The command is /path/to/kernel/tree/scripts/extract-vmlinux <kernel image> >vmlinux.
If the extracted kernel binary contains symbol information, you should¹ be able to create the System.map file using the mksysmap script from the same subdirectory. The command here is NM=nm /path/to/kernel/tree/scripts/mksysmap vmlinux System.map.
¹ The kernel images shipped with my distribution seem to be stripped, so the script was not able to get the symbols.
As Abrixas2 wrote, you will need a kernel image with symbol information in order to create System.map files and a packed vmlinuz image is not likely to have symbols in it. I can, however, verify that the script in your original post works with '-e' replaced with '-P' and '$' dropped, i.e.,
$ dd if=vmlinuz-3.8.0-19-generic skip=`grep -a -b -o -m 1 -P '\x1f\x8b\x08\x00' vmlinuz-3.8.0-19-generic | cut -d: -f 1` bs=1 | zcat > /tmp/vmlinux
gzip: stdin: decompression OK, trailing garbage ignored
I'm on ubuntu linux.
you can change $'\037\213\010\000' to "$(echo '\037\213\010\000')" in sh
bash$ N=$(grep -abo -m1 $'\037\213\010\000' vmlinuz-4.13.0-37-generic | awk -F: '{print $1+1}') &&
tail -c +$N vmlinuz-4.13.0-37-generic | gzip -d > /tmp/vmlinuz
try this :
dd if=vmlinuz bs=1 skip=24584 | zcat > vmlinux
with
24584 = 24576 + 8
when
od -A d -t x1 vmlinuz | grep '1f 8b 08 00'
gives
....... 0 1 2 3 . . . . 8
0024576 24 26 27 00 ae 21 16 00 1f 8b 08 00 7f 2f 6b 45
enjoy !
I would like to view the contents of a file in the current directory, but in binary from the command line. How can I achieve this?
xxd does both binary and hexadecimal.
bin:
xxd -b file
hex:
xxd file
hexdump -C yourfile.bin
unless you want to edit it of course. Most linux distros have hexdump by default (but obviously not all).
vi your_filename
hit esc
Type :%!xxd to view the hex strings, the n :%!xxd -r to return to normal editing.
As a fallback there's always od -xc filename
sudo apt-get install bless
Bless is GUI tool which can view, edit, seach and a lot more.
Its very light weight.
If you want to open binary files (in CentOS 7):
strings <binary_filename>
$ echo -n 'Hello world!' | hd
00000000 48 65 6c 6c 6f 20 77 6f 72 6c 64 21 |Hello world!|
0000000c
Hexyl formats nicely: sudo apt install hexyl
See Improved Hex editing in the Vim Tips Wiki.
You can open emacs (in terminal mode, using emacs -nw for instance), and then use Hexl mode: M-x hexl-mode.
https://www.gnu.org/software/emacs/manual/html_node/emacs/Editing-Binary-Files.html
To get the output all in a single line in Hexadecimal:
xxd -p yourfile.bin | tr -d '\n'
to convert a file to its binary codes(hexadecimal representation) we say:
xxd filename #
e.g:
xxd hello.c #
to see all the contents and codes in a binary file , we could use commands like readelf and objdump, hexdump ,... .
for example if we want to see all the convert all the contents of a binary file(executable, shared libraries, object files) we say:
hexdump binaryfilename
e.g.
hexdump /bin/bash
but readelf is the best utility for analyzing elf(executable and linking format) files. so if we say:
readelf -a /bin/bash
all the contents in the binary file bash would be shown to us, also we could provide different flags for readelf to see all the sections and headers of an elf file separately, for example if we want to see only the elf header we say:
readelf -h /bin/bash
for reading all the segments of the file:
readelf -l /bin/bash
for reading all the sections of the file:
readelf -S /bin/sh
but again as summary , for reading a normal file like "hello.c" and a binary file like bash in path /bin/bash in linux we say:
xxd hello.c
readelf -a /bin/bash
You can use hexdump binary file
sudo apt-get install hexdump
hexdump -C yourfile.bin