Hi ,
i'm searching for files over many Aix servers with rsh command using this request :
find /dir1 -name '*.' -exec ls {} \;
and then count them with "wc"
but i would improve this search because it's too long and replace directly find with ls command but "ls *. " doesn't work.
and... (3 Replies)
I have written a code using AWK & sed to compare two files.
The structure of the files is like this"
Format is this:
<bit code> <file code> <string>
Follwoed by any numbers of properties lines whic start with a "space"
10101010101111101 XX abcd a
AS sasa
BS kkk
1110000101010110 XX... (1 Reply)
I'm using sed to do find and replace. But since the file is huge and i have more than 1000 files to be searched, the script is taking a lot of time. Can somebody help me with a better sed command. Below is the details.
Input:
1
1
2
3
3
4
5
5
Here I know the file is sorted.
... (4 Replies)
Hi,
I wanted to run a particlar script for every 20 minutes. I dont have crontab in my server. Hence i ran this script in a loop by providing the command sleep 1200
Now i wanted to know is there any performance issue if this job keeps on execute in the server.
Thanks,
Puni (1 Reply)
Hi,
I have created a shell script for Server Log Automation Process. I have used
find xargs grep command to search the string.
for Example,
find -name | xargs grep "816995225" > test.txt .
Here my problem is,
We have lot of records and we want to grep the string... (4 Replies)
Hello All,
We have a working script which identifies and kills ipcs resources which havent been correctly killed during normal shutdowns.
It is working fine and dandy however there are some issues now.
Environment:
SunOS 5.10 Generic_148888-03 sun4u sparc SUNW,SPARC-Enterprise
... (4 Replies)
I have a ksh shell script and i need to pass arguments which are generated by data pulled from a database.
When the argument to the shell script is too long (about 4000 charecters) the below is the issue observed.
I copy the command which is 4000 charecters long from the logs and paste it... (7 Replies)
Discussion started by: mohtashims
7 Replies
LEARN ABOUT SUNOS
cksum
cksum(1) User Commands cksum(1)NAME
cksum - write file checksums and sizes
SYNOPSIS
cksum [file...]
DESCRIPTION
The cksum command calculates and writes to standard output a cyclic redundancy check (CRC) for each input file, and also writes to standard
output the number of octets in each file.
For each file processed successfully, cksum will write in the following format:
"%u %d %s
" <checksum>, <# of octets>, <path name>
If no file operand was specified, the path name and its leading space will be omitted.
The CRC used is based on the polynomial used for CRC error checking in the referenced Ethernet standard.
The encoding for the CRC checksum is defined by the generating polynomial:
G(x) = x**32 + x**26 + x**23 + x**22 + x**16 + x**12 + x**11 + x**10 + x**8 + x**7 + x**5 + x**4 + x**2 + x + 1
Mathematically, the CRC value corresponding to a given file is defined by the following procedure:
1. The n bits to be evaluated are considered to be the coefficients of a mod 2 polynomial M(x) of degree n-1. These n bits are the bits
from the file, with the most significant bit being the most significant bit of the first octet of the file and the last bit being the
least significant bit of the last octet, padded with zero bits (if necessary) to achieve an integral number of octets, followed by one
or more octets representing the length of the file as a binary value, least significant octet first. The smallest number of octets
capable of representing this integer is used.
2. M(x) is multiplied by x**32 (that is, shifted left 32 bits) and divided by G(x) using mod 2 division, producing a remainder R(x) of
degree <= 31.
3. The coefficients of R(x) are considered to be a 32-bit sequence.
4. The bit sequence is complemented and the result is the CRC.
OPERANDS
The following operand is supported:
file A path name of a file to be checked. If no file operands are specified, the standard input is used.
USAGE
The cksum command is typically used to quickly compare a suspect file against a trusted version of the same, such as to ensure that files
transmitted over noisy media arrive intact. However, this comparison cannot be considered cryptographically secure. The chances of a dam-
aged file producing the same CRC as the original are astronomically small; deliberate deception is difficult, but probably not impossible.
Although input files to cksum can be any type, the results need not be what would be expected on character special device files. Since this
document does not specify the block size used when doing input, checksums of character special files need not process all of the data in
those files.
The algorithm is expressed in terms of a bitstream divided into octets. If a file is transmitted between two systems and undergoes any data
transformation (such as moving 8-bit characters into 9-bit bytes or changing "Little Endian" byte ordering to "Big Endian"), identical CRC
values cannot be expected. Implementations performing such transformations may extend cksum to handle such situations.
See largefile(5) for the description of the behavior of cksum when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of cksum: LANG, LC_ALL, LC_CTYPE, LC_MES-
SAGES, and NLSPATH.
EXIT STATUS
The following exit values are returned:
0 All files were processed successfully.
>0 An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
SEE ALSO sum(1), attributes(5), environ(5), largefile(5), standards(5)SunOS 5.10 1 Feb 1995 cksum(1)