I want to save the contents of a variable to a file. How can that be achieved?
I have tried with:
echo $varname > textfile.txt
but for some reason it does not print anything. (1 Reply)
I am trying unsuccessfully to set into a variable a specific part of command output:
The command output will be as:
line 1: <varied>
line 2: 2 options:
option 1:
Set view: ** NONE **
or
option 2:
Set view: <different_name_of_views_always_without_spaces>
and I would like to get into... (7 Replies)
Hi,
I have a 3rd party tool on Solaris 8. I am running it thorugh my script but I am not able to capture its output into a variable.
Like, I tried, but did not work.
output=`/usr/bin/myTool`
echo $output
Also, I tried saving in a file but when I run, output is always shown on the... (19 Replies)
I am trying to use send and receive using expect. the expect_out(buffer) is working fine while it is running it as foreground. But the same script when it is ran as background, the expect_out(buffer) errored out.
Is there any factor influence when we run script in foreground and in background? ... (0 Replies)
Hi
i have a file which has mutiple line in it.
inside that i have a pattern similar to this
/abc/def/hij
i want to fine the pattern starting with "/" and get the first word in between the the symbols "/" i.e. "abc" in this case into a variable.
thanks in advance (13 Replies)
Hi,
I have 80 large files, from which I want to get a specific value to run a Bash script. Firstly, I want to get the part of a file which contains this:
Name =A
xxxxxx
yyyyyy
zzzzzz
aaaaaa
bbbbbb
Value = 57
This is necessary because in a file there are written more lines which... (6 Replies)
Hello,
I have a script that checks every file with a specific extension in a specific directory. The file names contain some numerical output and I am recording the file names with the best n outcomes.
The script finds all files in the directory with the extension .out.txt and uses awk to... (12 Replies)
Hi all, I have a file that contains characters. How do I get total of spesific character from that file and save the count to a variable for doing for calculation.
data.txt
1
2
2
2
2
3
3
4
5
6
7
8
5
4
3
4 (5 Replies)
I am trying to download all files from a user authentication, password protected https site, with a particular extension (.bam). The files are ~20GB each and I am not sure if the below is the best way to do it. I am also not sure how to direct the downloaded files to a folder as well as external... (7 Replies)
Discussion started by: cmccabe
7 Replies
LEARN ABOUT CENTOS
tpm_quote_tools
TPM QUOTE TOOLS(8) TPM QUOTE TOOLS(8)NAME
TPM Quote Tools
PROGRAMS
tpm_mkuuid, tpm_mkaik, tpm_loadkey, tpm_unloadkey, tpm_getpcrhash, tpm_updatepcrhash, tpm_getquote, tpm_verifyquote
DESCRIPTION
TPM Quote Tools is a collection of programs that provide support for TPM based attestation using the TPM quote operation.
A TPM contains a set of Platform Configuration Registers (PCRs). In a well configured machine, some of these registers are set to known
values during the boot up process or at other times. For example, a PCR might contain the hash of a boot loader in memory before it is
run.
The TPM quote operation is used to authoritatively verify the contents of a TPM's Platform Configuration Registers (PCRs). During provi-
sioning, a composite hash of a selected set of PCRs is computed. The TPM quote operation produces a composite hash that can be compared
with the one computed while provisioning.
To use the TPM quote operation, keys must be generated. During provisioning, an Attestation Identity Key (AIK) is generated for each TPM,
and the public part of the key is made available to entities that validate quotes.
The TPM quote operation returns signed data and a signature. The data that is signed contains the PCRs selected for the operation, the
composite hash for the selected PCRs, and a nonce provided as input, and used to prevent replay attacks. At provisioning time, the data
that is signed is stored, not just the composite hash. The signature is discarded.
An entity that wishes to evaluate a machine generates a nonce, and sends it along with the set of PCR used to generate the composite PCR
hash at provisioning time. For this use of the TPM quote operation, the signed data is ignored, and the signature returned is used to val-
idate the state of the TPM's PCRs. Given the signature, the evaluating entity replaces the nonce in the signed data generated at provi-
sioning time, and checks to see if the signature is valid for the data. If so, this check ensures the selected PCRs contain values that
match the ones measured during provisioning.
A typical scenario for an enterprise using these tools follows. The tools expect AIKs to be referenced via one enterprise-wide Universally
Unique Identifier (UUID). The program tpm_mkuuid creates one.
For each machine being checked, an AIK is created using tpm_mkaik. The key blob produced is bound to the UUID on its machine using
tpm_loadkey. The public key associated with the AIK is sent to the entities that verify quotes. Finally, the expected PCR composite hash
is obtained using tpm_getpcrhash. When the expected PCR values change, a new hash can be generated with tpm_updatepcrhash.
The program to obtain a quote, and thus measure the current state of the PCRs is tpm_getquote. The program that verifies the quote
describes the same PCR composite hash as was measured initially is tpm_verifyquote.
SEE ALSO tpm_mkuuid(8), tpm_mkaik(8), tpm_loadkey(8), tpm_unloadkey(8), tpm_getpcrhash(8), tpm_updatepcrhash(8), tpm_getquote(8), tpm_verifyquote(8)
Oct 2010 TPM QUOTE TOOLS(8)