11-12-2007
hey DRL thanks a ton!! for your help ..
but again as per the requirement of boss it has to be done using Unix shell script ( plsql if required)
the files
file1 and file2 won't necessarily have the same number of rows .
file1 and file2 have column values of a specific oracle table exported and stored in Unix system
on regular basis .
the idea is two compare the contents of the files of previous day and current day ( for e.g file1 is previous day's file and file2 is current day's file) i.e. we got to do row wise comparison of file and detect if there is change in any particular row value if any particular row in file2 (say for e.g row number 3 ) differs from row number 3 of file1 ... then the script should pick up the row num 3 value from
file 2 and re-direct it to another third file.
but since we got to verify previous day's and current day's records .. so even if both the files do not have same number of lines ... it won't be a problem as our target is to compare whether a particular row which had some value until yesterday still has the same value today or has it been changed..
in such case the script can compare until it reaches the row end of file1 .
hope i m clear with my question
Last edited by Dana Evans; 11-12-2007 at 11:54 PM..
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comm(1) User Commands comm(1)
NAME
comm - select or reject lines common to two files
SYNOPSIS
comm [-123] file1 file2
DESCRIPTION
The comm utility reads file1 and file2, which must be ordered in the current collating sequence, and produces three text columns as output:
lines only in file1; lines only in file2; and lines in both files.
If the input files were ordered according to the collating sequence of the current locale, the lines written will be in the collating
sequence of the original lines. If not, the results are unspecified.
OPTIONS
The following options are supported:
-1 Suppresses the output column of lines unique to file1.
-2 Suppresses the output column of lines unique to file2.
-3 Suppresses the output column of lines duplicated in file1 and file2.
OPERANDS
The following operands are supported:
file1 A path name of the first file to be compared. If file1 is -, the standard input is used.
file2 A path name of the second file to be compared. If file2 is -, the standard input is used.
USAGE
See largefile(5) for the description of the behavior of comm when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).
EXAMPLES
Example 1: Printing a list of utilities specified by files
If file1, file2, and file3 each contain a sorted list of utilities, the command
example% comm -23 file1 file2 | comm -23 - file3
prints a list of utilities in file1 not specified by either of the other files. The entry:
example% comm -12 file1 file2 | comm -12 - file3
prints a list of utilities specified by all three files. And the entry:
example% comm -12 file2 file3 | comm -23 -file1
prints a list of utilities specified by both file2 and file3, but not specified in file1.
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of comm: LANG, LC_ALL, LC_COLLATE,
LC_CTYPE, LC_MESSAGES, and NLSPATH.
EXIT STATUS
The following exit values are returned:
0 All input files were successfully output as specified.
>0 An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWesu |
+-----------------------------+-----------------------------+
|CSI |enabled |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
SEE ALSO
cmp(1), diff(1), sort(1), uniq(1), attributes(5), environ(5), largefile(5), standards(5)
SunOS 5.10 3 Mar 2004 comm(1)