Sponsored Content
Top Forums Shell Programming and Scripting read line in reverse order from file Post 302224389 by era on Wednesday 13th of August 2008 03:53:07 AM
Old 08-13-2008
Or in case you really mean read the lines in reverse order like the topic title says, look at the tac command.
 

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

sort a file in reverse order

I a file with log entries... I want to sort it so that the last line in the file is first and the first line is last.. eg. Sample file 1 h a f 8 6 After sort should look like 6 8 f a h 1 (11 Replies)
Discussion started by: frustrated1
11 Replies

2. Shell Programming and Scripting

Need to read a file in reverse

I have to extract data from a text file which is huge in size >>10GB. ie between two strings. If I do an ordinary sed it takes forever to come out. I was wondering if there was anyway to do the entire process in reverse and on finding the relevant string is there any way to break out of the... (5 Replies)
Discussion started by: scorreg
5 Replies

3. Shell Programming and Scripting

creating a file in reverse order of another file

Hi, I have a requirement where i need to write a script to create the new file from the given input file with the data in reverse order (bottom to top) Sample data: Input File-------------- Java VB Oracle Teradata Informatica Output file:----------------- Informatica Teradata Oracle... (3 Replies)
Discussion started by: srilaxmi
3 Replies

4. Shell Programming and Scripting

Conditional reverse of certain file line order

Hi I am brand new to programming, I dont know how to go about this task, or what language is best for this...If there is an easy solution in different languages, I would love to see them. I want to learn about the steps to take on this, so Please put in comments where code is used. I believe in... (9 Replies)
Discussion started by: perlrookie
9 Replies

5. Shell Programming and Scripting

How to manipulate first column and reverse the line order in third and fourth column?

How to manipulate first column and reverse the line order in third and fourth column as follws? For example i have a original file like this: file1 0.00000000E+000 -1.17555359E-001 0.00000000E+000 2.00000000E-002 -1.17555359E-001 0.00000000E+000 ... (1 Reply)
Discussion started by: Max Well
1 Replies

6. UNIX for Dummies Questions & Answers

How can I list the file under a directory both in alphabetical and in reverse alphabetical order?

How can I list the file under current directory both in alphabetical and in reverse alphabetical order? (1 Reply)
Discussion started by: g.ashok
1 Replies

7. Shell Programming and Scripting

How to get fields in reverse order?

i am having lines like below seperated by "|" (pipe) abc|xyz 123|567 i have to get the above in reverse order xyz|abc 567|123 Pls help (5 Replies)
Discussion started by: suryanarayana
5 Replies

8. UNIX for Dummies Questions & Answers

[Solved] Reverse the order of a list of file names (but not sort them alphabetically or numerically)

Hello all, I have a list of file names in a text document where each file name consists of 4 letters and 3 numbers (for example MACR119). There are 48 file names in the document (they are not in alphabetical or numerical order). I would like to reorder the list of names so that the 48th name is... (3 Replies)
Discussion started by: MDeBiasse
3 Replies

9. UNIX for Beginners Questions & Answers

How to create a summary file of all files in a directory sorted in reverse alphabetical order.?

I have an interactive script which works terrific at processing a folder of unsorted files into new directories. I am wondering how I could modify my script so that( upon execution) it provides an additional labelled summary file on my desktop that lists all of the files in each directory that... (4 Replies)
Discussion started by: Braveheart
4 Replies
TAC(1)									FSF								    TAC(1)

NAME
tac - concatenate and print files in reverse SYNOPSIS
tac [OPTION]... [FILE]... DESCRIPTION
Write each FILE to standard output, last line first. With no FILE, or when FILE is -, read standard input. Mandatory arguments to long options are mandatory for short options too. -b, --before attach the separator before instead of after -r, --regex interpret the separator as a regular expression -s, --separator=STRING use STRING as the separator instead of newline --help display this help and exit --version output version information and exit AUTHOR
Written by Jay Lepreau and David MacKenzie. REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>. COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
The full documentation for tac is maintained as a Texinfo manual. If the info and tac programs are properly installed at your site, the command info tac should give you access to the complete manual. tac (coreutils) 4.5.3 February 2003 TAC(1)
All times are GMT -4. The time now is 09:27 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy