Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Reading from a specific line in a loop
Top Forums Shell Programming and Scripting Reading from a specific line in a loop Post 302217720 by BMDan on Wednesday 23rd of July 2008 11:20:09 AM
Old 07-23-2008
What you're trying to do is either a homework problem, or else so terribly-defined as to defy any hope of getting a productive answer.

Let's examine the possibilities:
1) Your listed files are the extent of the data: Seriously? You're worried about performance when comparing four entries to four other entries?
2) Your listed files aren't the full extent of the data: You're worried about performance, but you're doing this as a shell script?
3) You're doing line-by-line comparisons: diff
4) You're looking for an entry in one file that doesn't exist in the other: sort | uniq | diff
etc., etc.

Please go into more detail about what you want and we'll be happy to assist, but your current post is doing neither you nor us any good. Lastly, a point of etiquette: "Request you to let me know how to do the below urgently.." is not useful. Unless you're paying for advice, you don't get to set the timetable.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

reading specific line from file

Hi all... I not a expert unix script programmer, Kindly adjust. My requirement is that, i have a file which contains the about 10 lines - say 1 2 3 ... 8 war of the worlds: => text in this line 9 9000,80,78,77,334,445 => this line contains some numbers separted by commas 10 ... (10 Replies)
Discussion started by: cool_boss2121
10 Replies

2. Shell Programming and Scripting

while loop not reading last line

hi all, i have a while loop which i am using to read lines into an array: k=0 exec 10<file while read LINE <&10; do ARRAY=$LINE ((k++)) done exec 10>&- echo ${ARRAY} for some reason when i display the array it is not showing the last row in the file. any help appreciated. (1 Reply)
Discussion started by: npatwardhan
1 Replies

3. Shell Programming and Scripting

Reading data from a specific line in a text file

hello, I have got the following problem that I am hoping someone can help with please. 1. I have got the following text file (below) , the columns data are 'Test Day', 'Board', 'Betting Number'. TEXT FILE ============================================ 1 3 02-01-27-28-29-30 0 1... (1 Reply)
Discussion started by: jermaine4ever
1 Replies

4. Shell Programming and Scripting

Reading data from a specific line in a text file

Hello, I have a problem which is giving me headache for days, can some please help. Please see code and text fiel below. Please see text in red for the problem I am facing # Program gets an input x from user while read line ; do echo... (4 Replies)
Discussion started by: jermaine4ever
4 Replies

5. Shell Programming and Scripting

Update a specific line in a file while reading sequentially

All, I know this is a very naive question but I could not find a way to get this working! I have a file with values like input.file Value1 Value2 server1/mylogin,mypasswd Value3 Value4 And in my code, I am reading the file line by line and processing it. #! /bin/ksh... (6 Replies)
Discussion started by: bharath.gct
6 Replies

6. UNIX for Dummies Questions & Answers

Reading a specific line from a file

Hi All, I am having 100 lines a text file say a.txt. I want read the 'nth' line from that file inside a script. Kindly tell us how to that. (2 Replies)
Discussion started by: boopathyvasagam
2 Replies

7. Shell Programming and Scripting

Read file using while loop not reading last line

I have written a script to read the file line by line. It is reading and printing the lines. But it is coming out of loop before reading last line. So I am not able to print last line. How do I solve it. (6 Replies)
Discussion started by: dgmm
6 Replies

8. Shell Programming and Scripting

While loop is not reading next line in the file when IF condition is used.

Hi Guys I am new to scripting.Please forgive for asking basic questions. I want to write a script to check whether the logs are getting updated in last 15 mins. cat server 192.168.1.6 192.168.1.7 cat list 192.168.1.7 /logs/logpath1 192.168.1.7 /logs/logpath2 192.168.1.6... (4 Replies)
Discussion started by: vdurai
4 Replies

9. Shell Programming and Scripting

Reading line in while loop

Hello Team, i have to read line by line in a while loop, and the input file has:. # The script will start cppunit test application to run unit tests. -LD_LIBRARY_PATH=$CPPUNIT_HOME/lib:\ +LD_LIBRARY_PATH=$VOBTAG/SS_UnitTest/lib:\ $VOBTAG/SS_BFD/BFDSCLI/build:\ ... (7 Replies)
Discussion started by: chandana hs
7 Replies

10. Shell Programming and Scripting

Reading line by line from live log file using while loop and considering only those lines start from

Hi, I want to read a live log file line by line and considering those line which start from time stamp; Below code I am using, which read line but throws an exception when comparing line that does not contain error code tail -F /logs/COMMON-ERROR.log | while read myline; do... (2 Replies)
Discussion started by: ketanraut
2 Replies

LEARN ABOUT MOJAVE

bdiff

bdiff(1)                                                           User Commands                                                          bdiff(1)

NAME

       bdiff - big diff

SYNOPSIS

       bdiff filename1 filename2 [n] [-s]

DESCRIPTION

       bdiff  is  used in a manner analogous to diff to find which lines in filename1 and filename2 must be changed to bring the files into agree-
       ment. Its purpose is to allow processing of files too large for diff. If filename1 (filename2) is -, the standard input is read.

       bdiff ignores lines common to the beginning of both files, splits the remainder of each file into n-line segments, and invokes diff on cor-
       responding segments. If both optional arguments are specified, they must appear in the order indicated above.

       The  output  of  bdiff  is exactly that of diff, with line numbers adjusted to account for the segmenting of the files (that is, to make it
       look as if the files had been processed whole). Note:  Because of the segmenting of the files, bdiff does not necessarily find  a  smallest
       sufficient set of file differences.

OPTIONS

       n        The  number  of line segments. The value of n is 3500 by default. If the optional third argument is given and it is numeric, it is
                used as the value for n. This is useful in those cases in which 3500-line segments are too large for diff, causing it to fail.

       -s       Specifies that no diagnostics are to be printed by bdiff (silent option). Note:  However, this does not suppress possible diagnos-
                tic messages from diff, which bdiff calls.

USAGE

       See largefile(5) for the description of the behavior of bdiff when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).

FILES

       /tmp/bd?????

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWesu                      |
       +-----------------------------+-----------------------------+
       |CSI                          |enabled                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       diff(1), attributes(5), largefile(5)

DIAGNOSTICS

       Use help for explanations.

SunOS 5.10                                                          14 Sep 1992                                                           bdiff(1)
All times are GMT -4. The time now is 11:34 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy