Hi,
How can I get this to work?
#!/bin/ksh
if ; then
direction=">>"
else
direction=">"
fi
cat some_file_name $direction temp.txt
exit
This shell script is not happy with using "$direction" opposed to ">" or ">>".
Thanks. (5 Replies)
Hi,
I have a data file delimited by Ω symbol, I would like to use this in grep and cut command. but How to type this Omega symbol.
Thanks
Murugesan (1 Reply)
Hi
Thanks for this amazing forum first, I've been searching answers in it for problems that I've encountered at work.
The only problem I haven't been able to find a fix for, is a ever waiting for prompt problem in Expect when encounter a $ prompt.
I usually set the timeout to -1 cause the... (2 Replies)
Dear All,
we have a command output which looks like :
Total 200 queues in 30000 Kbytes
and we're going to get "200" and "30000" for further process. currently, i'm using :
numA=echo $OUTPUT | awk '{print $2}'
numB=echo $OUTPUT | awk '{print $5}'
my question is : can I use just one... (4 Replies)
I have a target directory, there are some files and directories in "target_dir".
I have a symbol link: my_link -> <target_dir>
The target directory name is NOT known to the script (because it is varying), while the link name is always fixed.
In a shell script, how to remove both the... (1 Reply)
hi,
I have been trying to acheive the following task for a while now, but failed.. Need help, experts please help!
This is what I am trying to do:
- I am writing to a flat file the name of the source to be copied and the destination path as to where it is to be copied to.
Sample flat file:... (7 Replies)
Hi Team,
Can you please help me to resolve this issue.
Am unable to use this $ symbol in sql query in the shell script.
For Example:
# !/bin/sh
export USER_NAME=XXX
export PASSWORD=YYY
export ORACLE_SID=xamdb
echo $ORACLE_SID
echo " Session Details ..."
... (1 Reply)
I have a shell script (.sh) and I want to pass a parameter value to the awk command but I am getting exception, please assist.
diff=$1$2.diff
id=$2 new=new_$diff
echo "My id is $1"
echo "I want to sync for user account $id"
##awk command I am using is as below
cat $diff | awk... (2 Replies)
I have the following script, and I want to assign the output ($10 and $5) from awk to N and L:
grdinfo data.grd | awk '{print $10,$5}'| read N L
output from gridinfo data.grd is: data.grd 50 100 41 82 -2796 6944 0.016 0.016 3001 2461. where N and L is suppose to be 3001 and 100. I use... (8 Replies)
Discussion started by: geomarine
8 Replies
LEARN ABOUT CENTOS
evp_sealupdate
EVP_SealInit(3) OpenSSL EVP_SealInit(3)NAME
EVP_SealInit, EVP_SealUpdate, EVP_SealFinal - EVP envelope encryption
SYNOPSIS
#include <openssl/evp.h>
int EVP_SealInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type,
unsigned char **ek, int *ekl, unsigned char *iv,
EVP_PKEY **pubk, int npubk);
int EVP_SealUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out,
int *outl, unsigned char *in, int inl);
int EVP_SealFinal(EVP_CIPHER_CTX *ctx, unsigned char *out,
int *outl);
DESCRIPTION
The EVP envelope routines are a high level interface to envelope encryption. They generate a random key and IV (if required) then
"envelope" it by using public key encryption. Data can then be encrypted using this key.
EVP_SealInit() initializes a cipher context ctx for encryption with cipher type using a random secret key and IV. type is normally supplied
by a function such as EVP_des_cbc(). The secret key is encrypted using one or more public keys, this allows the same encrypted data to be
decrypted using any of the corresponding private keys. ek is an array of buffers where the public key encrypted secret key will be written,
each buffer must contain enough room for the corresponding encrypted key: that is ek[i] must have room for EVP_PKEY_size(pubk[i]) bytes.
The actual size of each encrypted secret key is written to the array ekl. pubk is an array of npubk public keys.
The iv parameter is a buffer where the generated IV is written to. It must contain enough room for the corresponding cipher's IV, as
determined by (for example) EVP_CIPHER_iv_length(type).
If the cipher does not require an IV then the iv parameter is ignored and can be NULL.
EVP_SealUpdate() and EVP_SealFinal() have exactly the same properties as the EVP_EncryptUpdate() and EVP_EncryptFinal() routines, as
documented on the EVP_EncryptInit(3) manual page.
RETURN VALUES
EVP_SealInit() returns 0 on error or npubk if successful.
EVP_SealUpdate() and EVP_SealFinal() return 1 for success and 0 for failure.
NOTES
Because a random secret key is generated the random number generator must be seeded before calling EVP_SealInit().
The public key must be RSA because it is the only OpenSSL public key algorithm that supports key transport.
Envelope encryption is the usual method of using public key encryption on large amounts of data, this is because public key encryption is
slow but symmetric encryption is fast. So symmetric encryption is used for bulk encryption and the small random symmetric key used is
transferred using public key encryption.
It is possible to call EVP_SealInit() twice in the same way as EVP_EncryptInit(). The first call should have npubk set to 0 and (after
setting any cipher parameters) it should be called again with type set to NULL.
SEE ALSO evp(3), rand(3), EVP_EncryptInit(3), EVP_OpenInit(3)HISTORY
EVP_SealFinal() did not return a value before OpenSSL 0.9.7.
1.0.1e 2013-02-11 EVP_SealInit(3)