04-05-2010
Shell Script: Compare 2 Files and Extract Unique Elements of Each File into 2 New Files
Thanks for the reply danmero. I made a mistake in the description. Let me re-phrase the question again.
File_A contains Strings and content's elements are NOT IN ANY ORDER OR PATTERN AND file varies in size from one run to the next run:
a <- in both File_A and File_B
b <- unique to File_A
c <- in both File_A and File_B
d <- unique to File_A
File_B contains Strings and content's elements are NOT IN ANY ORDER OR PATTERN AND file varies in size from one run to the next run:
a <- in both File_A and File_B
c <- in both File_A and File_B
z <- unique to File_B
Need to have script written in either sh or ksh. Resultant files (File_New_A and File_New_B) is derived from comparing contents of files File_A and File_B where resultant string elements in File_New_A and File_New_B are listed below. Resultant File_New_A will contain only unique elements found only in File_A when compared with File_B. File_New_B will contain only unique elements found in only File_B when compared with File_A.
Resultant files:
File_New_A contains String:
b <- unique to File_A
d <- unique to File_A
File_New_B contains String:
z <- unique to File_B
++++++++++++++++++++++++++++++++++++++
The next run could have
File_A contains Strings and content's elements are NOT IN ANY ORDER OR PATTERN AND file varies in size from one run to the next run:
m <- only in File_A
n <- only in File_A
o <- only in File_A
p <- only in File_A
q <- in both File_A and File_B
r <- in both File_A and File_B
File_B contains Strings and content's elements are NOT IN ANY ORDER OR PATTERN AND file varies in size from one run to the next run:
q <- in both File_A and File_B
r <- in both File_A and File_B
Resultant files after comparing File_A and File_B:
Resultant files:
File_New_A contains String:
m <- unique to File_A
n <- unique to File_A
o <- unique to File_A
p <- unique to File_A
File_New_B contains String:
No elements in File_New_B since File_B have no unique elements to File_B, all files in File_B are also in File_A; therefore File_New_B is empty.
I hope this is more clearer.
Thank you.
Matt
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LEARN ABOUT ULTRIX
return
exit(1) User Commands exit(1)
NAME
exit, return, goto - shell built-in functions to enable the execution of the shell to advance beyond its sequence of steps
SYNOPSIS
sh
exit [n]
return [n]
csh
exit [ ( expr )]
goto label
ksh
*exit [n]
*return [n]
DESCRIPTION
sh
exit will cause the calling shell or shell script to exit with the exit status specified by n. If n is omitted the exit status is that of
the last command executed (an EOF will also cause the shell to exit.)
return causes a function to exit with the return value specified by n. If n is omitted, the return status is that of the last command exe-
cuted.
csh
exit will cause the calling shell or shell script to exit, either with the value of the status variable or with the value specified by the
expression expr.
The goto built-in uses a specified label as a search string amongst commands. The shell rewinds its input as much as possible and searches
for a line of the form label: possibly preceded by space or tab characters. Execution continues after the indicated line. It is an error to
jump to a label that occurs between a while or for built-in command and its corresponding end.
ksh
exit will cause the calling shell or shell script to exit with the exit status specified by n. The value will be the least significant 8
bits of the specified status. If n is omitted then the exit status is that of the last command executed. When exit occurs when executing
a trap, the last command refers to the command that executed before the trap was invoked. An end-of-file will also cause the shell to exit
except for a shell which has the ignoreeof option (See set below) turned on.
return causes a shell function or '.' script to return to the invoking script with the return status specified by n. The value will be the
least significant 8 bits of the specified status. If n is omitted then the return status is that of the last command executed. If return
is invoked while not in a function or a '.' script, then it is the same as an exit.
On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:
1. Variable assignment lists preceding the command remain in effect when the command completes.
2. I/O redirections are processed after variable assignments.
3. Errors cause a script that contains them to abort.
4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not
performed.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
break(1), csh(1), ksh(1), sh(1), attributes(5)
SunOS 5.10 15 Apr 1994 exit(1)