08-02-2018
Quote:
Originally Posted by
RudiC
No posts because you were asked to show your own efforts first. Even failed approaches give base to discussions / improvements / learnings.
I am just asking for help so that I can process my data faster. Efforts were did put in, but not using shell, but thanks for your interest to point things out
9 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi folks,
I have a big problem.... and need help from your experience/knowledge.
I previously install and use FREEBSD 7.0 release on my storage/backup
file server, for some reason, I can not transfer any files that is bigger
than 1GB. If I transfer it to Freebsd file server, the system... (2 Replies)
Discussion started by: bsdme2
2 Replies
2. Shell Programming and Scripting
Hello
We have a text file with 400,000 lines and need to split into multiple files each with 5000 lines ( will result in 80 files)
Got an idea of using head and tail commands to do that with a loop but looked not efficient.
Please advise the simple and yet effective way to do it.
TIA... (3 Replies)
Discussion started by: prvnrk
3 Replies
3. Programming
Hi,
I've created a simple application that is supposed to fill up a file with messages up
to the size I pass as parameter.
The problem is that once the file reaches the 2GB size, it stops growing.
The flow of the application, for what is worth, is as follows:
while ( bytes written <... (7 Replies)
Discussion started by: emitrax
7 Replies
4. Shell Programming and Scripting
Hello Unix Gurus,
Please let me know if this is hard to understand and I apologize for my inability to explain better.
I have a file "Foo" with the following structure
CHR_A BP_A SNP_A CHR_B BP_B SNP_B R2
1 ... (3 Replies)
Discussion started by: genehunter
3 Replies
5. Shell Programming and Scripting
Hi,
I have 2 files
format of file 1 is:
a1
b2
a2
c2
d1
f3
format of file 2 is (tab delimited):
a1 1.2 0.5 0.06 0.7 0.9 1 0.023
a3 0.91 0.007 0.12 0.34 0.45 1 0.7
a2 1.05 2.3 0.25 1 0.9 0.3 0.091
b1 1 5.4 0.3 9.2 0.3 0.2 0.1
b2 3 5 7 0.9 1 9 0 1
b3 0.001 1 2.3 4.6 8.9 10 0 1 0... (10 Replies)
Discussion started by: Lucky Ali
10 Replies
6. Shell Programming and Scripting
Hi,
I have a big text file with m columns and n rows. The format is like:
STF123450001000200030004STF123450005000600070008STF123450009001000110012
STF234560345002208330154STF234590705620600070080STF234567804094562357688
STF356780001000200030004STF356780005000600070080STF356780800094562657687... (2 Replies)
Discussion started by: wintersnow2011
2 Replies
7. Shell Programming and Scripting
Hi guys,
I tried to write a script for replacing some number in a bunch of files. However, I failed because my limited bash scripting knowledge.
Here I will explain the expected function:
I have many data files need to be processed. Here shows one part of a file as an example: a list with... (7 Replies)
Discussion started by: liuzhencc
7 Replies
8. Shell Programming and Scripting
I want to compare 4 edge-lists to basically see if an edge is present in all 4 networks. The issue is that an edge A-B in one file can be present as B-A in another file.
Example:
Input 1: net1.txt
A B 0.1
C D 0.65
D E 0.9
E A 0.7
Input 2: net2.txt
A Z 0.1
C D 0.65
E D 0.9
E A... (1 Reply)
Discussion started by: Sanchari
1 Replies
9. Shell Programming and Scripting
Hello,
I have some large text files that look like,
putrescine
Mrv1583 01041713302D
6 5 0 0 0 0 999 V2000
2.0928 -0.2063 0.0000 N 0 0 0 0 0 0 0 0 0 0 0 0
5.6650 0.2063 0.0000 N 0 0 0 0 0 0 0 0 0 0 0 0
3.5217 ... (3 Replies)
Discussion started by: LMHmedchem
3 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)