Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: awk updating one file with another, comparing, updating
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

LEARN ABOUT LINUX

shtool-path

SHTOOL-PATH.TMP(1)					      GNU Portable Shell Tool						SHTOOL-PATH.TMP(1)

NAME

       shtool-path - GNU shtool command dealing with shell path variables

SYNOPSIS

       shtool path [-s|--suppress] [-r|--reverse] [-d|--dirname] [-b|--basename] [-m|--magic] [-p|--path path] str [str ...]

DESCRIPTION

       This command deals with shell $PATH variables. It can find a program through one or more filenames given by one or more str arguments.  It
       prints the absolute filesystem path to the program displayed on "stdout" plus an exit code of 0 if it was really found.

OPTIONS

       The following command line options are available.

       -s, --suppress
	   Supress output. Useful to only test whether a program exists with the help of the return code.

       -r, --reverse
	   Transform a forward path to a subdirectory into a reverse path.

       -d, --dirname
	   Output the directory name of str.

       -b, --basename
	   Output the base name of str.

       -m, --magic
	   Enable advanced magic search for ""perl"" and ""cpp"".

       -p, --path path
	   Search in path. Default is to search in $PATH.

EXAMPLE

	#   shell script
	awk=`shtool path -p "${PATH}:." gawk nawk awk`
	perl=`shtool path -m perl`
	cpp=`shtool path -m cpp`
	revpath=`shtool path -r path/to/subdir`

HISTORY

       The GNU shtool path command was originally written by Ralf S.  Engelschall <rse@engelschall.com> in 1998 for Apache. It was later taken
       over into GNU shtool.

SEE ALSO

       shtool(1), which(1).

18-Jul-2008							   shtool 2.0.8 						SHTOOL-PATH.TMP(1)
All times are GMT -4. The time now is 11:36 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy