Sponsored Content
Top Forums Shell Programming and Scripting Reversing file order using SED Post 29102 by Perderabo on Monday 30th of September 2002 09:43:32 AM
Old 09-30-2002
Optimus_P, this doesn't look like homework to me. Reversing a list of patches may be necessary to back them all out correctly. I do agree that "sed" is not a great choice. But we need more than just "sort". We can't assume that the data is currently sorted.

MBGPS, it looks like you completely overwrite the file on each iteration. If you don't have the "rev" command, try this:
nl -ba input | sort -nr | cut -f2- > output
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

using sed and regex to reverse order???

so i have been trying to learn how to manipulate text on my own and have gotten stumped... let's say i have a text file that says (highly simplified): people ordinary How would swap the order of the words.. I know i need to use sed and some kind of back reference but cannot make it... (2 Replies)
Discussion started by: urtherhoda
2 Replies

2. Shell Programming and Scripting

output string in reversing order

If I have string { I_love_shell_scripts} anyone knows how to have output {stpircs_llehs_evol_I} by using shell and perl ?I know in perl, there is reverse() funcation, but can it be done by not using reverse()? (3 Replies)
Discussion started by: ccp
3 Replies

3. UNIX for Dummies Questions & Answers

Changing the order using sed

I have a text "abc def ghi" and I want to get it as "def abc ghi" I am using this echo "abc def ghi" | sed 's/\(*\)\(*\)/\2\1/' But I am not able to get the output, could anyone help me. Thanks (9 Replies)
Discussion started by: venu_nbk
9 Replies

4. Shell Programming and Scripting

reversing a line

Hi, I could not find this anywhere and I am wondering if someone knows a quick way of doing this. So heres the problem... I have a row that looks like this (an example): 5 4 3 2 1 What I want to do is reverse it so it looks like this: 1 2 3 4 5 Does anyone know the simple unix... (7 Replies)
Discussion started by: kylle345
7 Replies

5. Shell Programming and Scripting

sed or awk to order a file

Hi - I have a file with lots of lines in that I need to order based on the number of commas! e.g the file looks something like :- cn=john,cn=users,cn=uk,dc=dot,dc=com cn=john,cn=users,dc=com cn=users,cn=groups,dc=com cn=john,cn=admins,cn=users,cn=uk,dc=dot,dc=com... (4 Replies)
Discussion started by: sniper57
4 Replies

6. Shell Programming and Scripting

reversing order of lines in a file

how can i reverse the line order in text files? (but total number of the lines is not constant ) for example i have a file like this: line1 line2 line3 . . lineN i wantto make it like this: lineN . . . line3 (26 Replies)
Discussion started by: gfhgfnhhn
26 Replies

7. UNIX for Dummies Questions & Answers

Reversing line and word order using awk

Hello, I am new to awk and I was wandering if I could reverse line and word order from a text file using awk. I figured out how to do them both separately, but can't quite figure out how to mix them. Example: Input file: dog cat mouse 1 2 3 I am new to awk Output of the awk program:... (3 Replies)
Discussion started by: blink_w
3 Replies

8. Shell Programming and Scripting

Reversing text order of each line of a file in UNIX

My input is: hello how are you my chemistry book is lost what is up etc... And I want the output to be: you are how hello lost is book chemistry my up is what .... I found an earlier response to a similar question but it was not accurate as it required a certain string length for each line (2 Replies)
Discussion started by: Heidi Heweidy
2 Replies

9. Shell Programming and Scripting

sed string with any order

Hi, i have a strange prob. log file contains ip, protocol, user name, agent . these can be in any order. If log contains the above order able to fetch all details but if details are in diff order not able to fetch all details. using below command. grep -A50 "Entry " "/logs/file.log" \ |grep... (6 Replies)
Discussion started by: Satyak
6 Replies

10. Shell Programming and Scripting

sed - searching token in certain order

Hello. I would like to write a bash function which would return "true" if the search succeed else return anything else. something like if ] ; then exit 1 fi function my_funct () { find first occurrence $2 in $1 if not found return "false" from that position,... (6 Replies)
Discussion started by: jcdole
6 Replies
SORT(1) 						      General Commands Manual							   SORT(1)

NAME
sort - sort a file of ASCII lines SYNOPSIS
sort [-bcdfimnru] [-tc] [-o name] [+pos1] [-pos2] file ... OPTIONS
-b Skip leading blanks when making comparisons -c Check to see if a file is sorted -d Dictionary order: ignore punctuation -f Fold upper case onto lower case -i Ignore nonASCII characters -m Merge presorted files -n Numeric sort order -o Next argument is output file -r Reverse the sort order -t Following character is field separator -u Unique mode (delete duplicate lines) EXAMPLES
sort -nr file # Sort keys numerically, reversed sort +2 -4 file # Sort using fields 2 and 3 as key sort +2 -t: -o out # Field separator is : sort +.3 -.6 # Characters 3 through 5 form the key DESCRIPTION
Sort sorts one or more files. If no files are specified, stdin is sorted. Output is written on standard output, unless -o is specified. The options +pos1 -pos2 use only fields pos1 up to but not including pos2 as the sort key, where a field is a string of characters delim- ited by spaces and tabs, unless a different field delimiter is specified with -t. Both pos1 and pos2 have the form m.n where m tells the number of fields and n tells the number of characters. Either m or n may be omitted. SEE ALSO
comm(1), grep(1), uniq(1). SORT(1)
All times are GMT -4. The time now is 10:02 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy