Sponsored Content
Top Forums Shell Programming and Scripting awk updating one file with another, comparing, updating Post 302203745 by mecano on Monday 9th of June 2008 07:02:41 PM
Old 06-09-2008
Thanks a lot for taking the time to explain all this radoulov ^^ that's really great !

Quote:
I think the sort command will cast it correctly. Do you have an example where the input like this is not sorted correctly?
well not in that particular case but i remember having to strip the ';' to be able to use 'sort -n' correctly (without specifying a key, i just extract last field with awk then apply sort -n to it. A shame 'sort' doesn't allow reverse key selection), for example with values like :
27384;
7384; or 384;
but I tried so many different things, I guess this should be a remain of some mistypes/mistakes on my side or because of the Windows line endings some files seems to have (some files are created on Windows and some on Unix) ?

No the last field is not fixed because I'm on a bash script utility for sql queries files sorting/updating, this have to be used on several different files where the number of fields is not always the same and where the key value can be, rarely but happens, in the middle of the line.
So in this case taking a $key arguments from cli:
awk 'END{for(k in _)print _[k]}{_[$'"$key"']=$0}' $file1 $file2 > $file1.updated
with an additionnal conditional on argument '0' for the end of the line (because I didn't get $key to turn into NF and awk taking '"$key"').
I'm making it for a small community and it has to be really simple.
If you're not afraid to read awfull code I can post it ^^
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Constantly updating log files (tail -f? grep? awk?)

I have a log file which is continuously added to, called log.file. I'd like to monitor this file, and when certain lines are found, update some totals in another file. I've played around with tail -f, grep, and awk, but can't seem to hit the right note, so to speak. The lines I'm... (0 Replies)
Discussion started by: nortonloaf
0 Replies

2. UNIX for Dummies Questions & Answers

Korn shell awk use for updating two files

Hi, I have two text files containing records in following format: file1 format is: name1 age1 nickname1 path1 name2 age2 nickname2 path2 file 1 example is: abcd 13 abcd.13 /home/temp/abcd.13 efgh 15 efgh.15 /home/temp/new/efgh.15 (4 Replies)
Discussion started by: alrinno
4 Replies

3. UNIX for Dummies Questions & Answers

Updating specific fields with awk using conditions

Can someone help me again, I think with awk? I have a file with 4 columns (pipe-delimited): I just want to convert the last field so that e1 is now 'message 1', e2 is 'message 2', e0 is 'message 3', etc. I don't want to change any other columns because the e0-e10 code may appear as part of a... (4 Replies)
Discussion started by: giannicello
4 Replies

4. Shell Programming and Scripting

Updating a line in a large csv file, with sed/awk?

I have an extremely large csv file that I need to search the second field, and upon matches update the last field... I can pull the line with awk.. but apparently you cant use awk to directly update the file? So im curious if I can use sed to do this... The good news is the field I want to... (5 Replies)
Discussion started by: trey85stang
5 Replies

5. Shell Programming and Scripting

AWK and sub/gsub: updating a date/time block

I have a file ("modtest") in which I want to update the last date/time block in the lines beginning with a period. Here is a sample: .ROMULT 10150908EDT 10270908EDT 10010908EDT RANGE RAWV2 1.00 .ROMULT 10150908EDT 10270908EDT 10010908EDT FGROUP CHOWANRV 1.00 .RRIMULT 10150908EDT... (10 Replies)
Discussion started by: chrismcg24
10 Replies

6. Shell Programming and Scripting

Comparing 2 files with awk and updating 2nd file

file1: (unique files) 1 /pub/atomicbk/catalog/catalog.gif 693 2 /pub/atomicbk/catalog/home.gif 813 3 /pub/atomicbk/catalog/logo2.gif 12871 4 /pub/atomicbk/catalog/sleazbk.html 18338 file2: (duplicate filenames allowed) 28/Aug/1995:00:00:38 1 /pub/atomicbk/catalog/home.gif 813... (2 Replies)
Discussion started by: jontjioe
2 Replies

7. Shell Programming and Scripting

awk - updating variable in if statement

I have another question I am stuck at :wall: I have a text file with two columns, like so... 2 0.0627279 3 0.0794451 4 0.108705 5 0.137739 6 0.190394 7 0.217407 8 0.241764 9 0.344458 10 0.460762 I'd like to go through the file line by line until the value in the second column... (3 Replies)
Discussion started by: origamisven
3 Replies

8. Shell Programming and Scripting

Help updating a file

I can not seem to figure out how to update the attached match.txt column 2 using update.txt. However, only the text before the period in updat.txt appears in match.txt. For example, in update.txt NM_001613.2 matches NM_001613 in match.txt, so is it possible to update the record in match.txt to... (8 Replies)
Discussion started by: cmccabe
8 Replies

9. Shell Programming and Scripting

Updating variables using sed or awk

Hi, I have a file(testfile.txt) that contains list of variables as shown below. T $$FirstName=James $$LastName=Fox $$Dateofbirth=1980-02-04 ……and so on there are 50 different variables. I am writing a script(script1.sh) that will update the above three variable one by one with the values... (6 Replies)
Discussion started by: Saanvi1
6 Replies

10. UNIX for Beginners Questions & Answers

Updating in file

hi, i have an csv(which is a month's log file containing userid and log in date ) file which has to be appended to another file say master.log.I need to compare the next month's log data to master.log file .In case, there is new log date for userid it has to get updated in master.log file or i... (2 Replies)
Discussion started by: preema
2 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 12:33 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy