Here is my problem.. i have 2 files (file1, file2).. i have wrote the last two lines and first 4 lines of "file2" into two different variables .. say..
my $firstrec = `head -4 $file2`;
my $lastrec = `tail -2 $file2`;
and i write the rest of the file2 to a tmpfile and cat it with head -4 | tail -2 of file1 ...
now i need to add the first line and last lines to this tmpfile...
any suggestions are appreciated......thanks
I'm confused, why are you using perl if you are shelling out to the operating system? Unless file2 is gigantic, read it all into an array. Then use the array to do what you want.
Of course all those temp arrays are probably not necessary, I just use them to illustrate the array slice syntax you can use to achieve this using perl.
But I do not understand this requirement so I can't advise further:
Hi All,
I need to write a shell script(ksh) to take the tables backup in oracle(exporting tables data).
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I have to write a perl script that gets trashholds from a file and match them with an output of a command.
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"pl-it_prod.GW.Sync.reply.*" "500" "-1" "" ""
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Hi,
I have two text files. Need to create a third text file extracting specific data from first two existing files..
Text File 1: Format contains:
SQL*Loader: Release 10.2.0.1.0 - Production on Wed Aug 4 21:06:34 2010
some text ............so on...and somwhere text like:
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I have written a perl scripts which loads the data.
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Hi,
i need a perl script which reads the file, content is given below. and output in new file.
TARGET DRIVE IO1 IO2 IO3 IO4 IO5
------------ --------- --------- --------- --------- ---------
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I have a function which does awk proceessing
sub mergeDescription {
system (q@awk -F'~' '
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Hi,
I am new to perl.
I am trying to write a small perl script for search and replace in a file :
========================================================
#!/usr/bin/perl
my $searchStr = "register_inst\.write_t\(";
my $replaceStr = "model\.fc_block\.";
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Hi, I am complete new to C programming and shell scripting. I just wrote a simple C code to calculate integral using trapezoid rule. I am prompting user to pass me No. of equally spaced points , N , upper and lower limit. My code looks as follows so far:
#include<stdio.h>
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Hi There,
I'm trying to write a simple script that will email me when we have an application job in a certain status that needs human intervention. I've used this script for other tables and it works great. However, this one gives me the warning that there is binary data so it might not. ... (2 Replies)
We have the data looks like below in a log file.
I want to generat files based on the string between two hash(#) symbol like below
Source:
#ext1#test1.tale2 drop
#ext1#test11.tale21 drop
#ext1#test123.tale21 drop
#ext2#test1.tale21 drop
#ext2#test12.tale21 drop
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Discussion started by: Sanjeev G
5 Replies
LEARN ABOUT V7
diff
DIFF(1) General Commands Manual DIFF(1)NAME
diff - differential file comparator
SYNOPSIS
diff [ -efbh ] file1 file2
DESCRIPTION
Diff tells what lines must be changed in two files to bring them into agreement. If file1 (file2) is `-', the standard input is used. If
file1 (file2) is a directory, then a file in that directory whose file-name is the same as the file-name of file2 (file1) is used. The
normal output contains lines of these forms:
n1 a n3,n4
n1,n2 d n3
n1,n2 c n3,n4
These lines resemble ed commands to convert file1 into file2. The numbers after the letters pertain to file2. In fact, by exchanging `a'
for `d' and reading backward one may ascertain equally how to convert file2 into file1. As in ed, identical pairs where n1 = n2 or n3 = n4
are abbreviated as a single number.
Following each of these lines come all the lines that are affected in the first file flagged by `<', then all the lines that are affected
in the second file flagged by `>'.
The -b option causes trailing blanks (spaces and tabs) to be ignored and other strings of blanks to compare equal.
The -e option produces a script of a, c and d commands for the editor ed, which will recreate file2 from file1. The -f option produces a
similar script, not useful with ed, in the opposite order. In connection with -e, the following shell program may help maintain multiple
versions of a file. Only an ancestral file ($1) and a chain of version-to-version ed scripts ($2,$3,...) made by diff need be on hand. A
`latest version' appears on the standard output.
(shift; cat $*; echo '1,$p') | ed - $1
Except in rare circumstances, diff finds a smallest sufficient set of file differences.
Option -h does a fast, half-hearted job. It works only when changed stretches are short and well separated, but does work on files of
unlimited length. Options -e and -f are unavailable with -h.
FILES
/tmp/d?????
/usr/lib/diffh for -h
SEE ALSO cmp(1), comm(1), ed(1)DIAGNOSTICS
Exit status is 0 for no differences, 1 for some, 2 for trouble.
BUGS
Editing scripts produced under the -e or -f option are naive about creating lines consisting of a single `.'.
DIFF(1)