Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Find and Replace in multiple fields using awk
Top Forums Shell Programming and Scripting Find and Replace in multiple fields using awk Post 302601776 by machomaddy on Friday 24th of February 2012 10:50:14 AM
Old 02-24-2012
Find and Replace in multiple fields using awk
Hi,

Say I have a record "1|22| | |". In which the third and fourth fields are <space> alone. I have to replace the <Space> with <null>.

Input:
Code:
"1|22| | |" --> "1|22|<space> |<space> |"

Expected output:
Code:
"1|22|||" --> "1|22|<null> |<null>|"

I tried:
Code:
echo "1|22| | |" | awk -F '|' -v v1=" " -v v2="" 'BEGIN{OFS="|";}{gsub(v1,v2,$3);print}' 
echo "1|22| | |" | awk -F '|' -v v1=" " -v v2="" 'BEGIN{OFS="|";} {gsub(v1,v2,$4);print}'

The above code works fine. But is there a way in which I can pass a array of fields rather than one by one?? Smilie
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

How do I read/find/replace fields in a csv datafile?

hello. I'm somewhat a novice here so please be patient. My stumbling block when loading csvs into ORACLE tables is this: I need to read a csv datafile, check several fields in each line, and if any of stated fields contain A ZERO only then replace it with a null/blank character. I had a... (9 Replies)
Discussion started by: MrCarter
9 Replies

2. Shell Programming and Scripting

awk find and replace in multiple files

Hi I use the following code to replace ‘.' with ‘N' in my files and keep both versions. awk '{ gsub(/\./,"N"); print }' file_0001.txt > path/to/new/dir/file_0001.txt I need help on how to apply the code to 100 files instead of doing them one file at a time. The files are labeled... (7 Replies)
Discussion started by: jdhahbi
7 Replies

3. Shell Programming and Scripting

AWK multiple fields separators

I need to print the second field of a file, taking spaces, tab and = as field separators. ; for 16-bit app support MAPI=1 CMC=1 CMCDLLNAME32=mapi32.dll CMCDLLNAME=mapi.dll MAPIX=1 MAPIXVER=1.0.0.1 OLEMessaging=1 asf=MPEGVideo asx=MPEGVideo ivf=MPEGVideo m3u=MPEGVideo (2 Replies)
Discussion started by: PamPam
2 Replies

4. Shell Programming and Scripting

help with search and replace in multiple fields

I have a pipe delimited file with 27 fields. Each record has 26 fields. I need to search for the 25,26,27 fields and replace "," with nothing. How can I acheive this. Sed is more preferred. e.g data row o/p (5 Replies)
Discussion started by: dsravan
5 Replies

5. Shell Programming and Scripting

AWK: merge two files and replace some fields

Need some code tweak: awk 'END { for (i=1; i<=n; i++) if (f2]) print f2] } NR == FNR { f2 = $1] = $0 next } $1 in f2 { delete f2 }1' FS=, OFS=, 2.csv 1.csv > 3.csvfile 1.csv have: $1,$2,$3,$4,$5,$6,$7,$8,$9...... file 2.csv have: $1,$2,$3,$4,$5,$6 (2 Replies)
Discussion started by: u10
2 Replies

6. Shell Programming and Scripting

Script to find & replace a multiple lines string across multiple php files and subdirectories

Hey guys. I know pratically 0 about Linux, so could anyone please give me instructions on how to accomplish this ? The distro is RedHat 4.1.2 and i need to find and replace a multiple lines string in several php files across subdirectories. So lets say im at root/dir1/dir2/ , when i execute... (12 Replies)
Discussion started by: spfc_dmt
12 Replies

7. Shell Programming and Scripting

awk gsub multiple fields

Hi, I am trying to execute this line awk -F ";" -v OFS=";" '{gsub(/\./,",",$6); print}' FILE but for multiple fields $6 $7 $8 Do you have a suggstion? Tried: awk -F ";" -v OFS="";"" "function GSUB( F ) {gsub(/\./,\",\",$F); print} { GSUB( 6 ); GSUB( 7 ); GSUB( 8 ) } 1"... (2 Replies)
Discussion started by: nakaedu
2 Replies

8. Shell Programming and Scripting

Find fields and replace using awk

Code: Using ksh Var1=`awk -F";" {print $1}' Input2.txt` cat Input1.txt | awk -F";" '{$3="Var1"}' > Output.txt (13 Replies)
Discussion started by: Roozo
13 Replies

9. Shell Programming and Scripting

Replace 0 with 1 in multiple fields with awk

Hello, I have the following input file: 1 3 3 2 3 3 4 0 4 0 5 4 5 2 2 0 5 3 4 0 6 0 3 2 I am trying to remove all zeroes in fields 2 and 4 and replace them with "1's" I tried the following, but it's not working awk -F"\t" '{ if (($2==0) || ($4==0) $2=1; $4=1; print $0 ) }' input ... (8 Replies)
Discussion started by: Rabu
8 Replies

10. Shell Programming and Scripting

Print multiple fields with awk

so its common knowledge one can print multiple fields with simple commands like this: echo 12 44 45 552 24 | awk '{print $1,$4,$3}' but suppose i want to avoid specifying the "$" symbol. is that possible? can something like this be done: echo 12 44 45 552 24 | awk '{print $(1,4,3)}' ... (9 Replies)
Discussion started by: SkySmart
9 Replies

LEARN ABOUT DEBIAN

dpkg-ruby

DPKG-RUBY(1)						      General Commands Manual						      DPKG-RUBY(1)

NAME

       dpkg-ruby - Utility to read a dpkg style db file, dpkg-awk clone

SYNOPSIS

       dpkg-ruby  [(-f|--file) filename] [(-d|--debug) ##] [(-s|--sort) list] [(-n|--numeric) list] [(-rs|--rec_sep) ??] '<fieldname>:<regex>' ...
       -- <out_fieldname> ..

DESCRIPTION

       dpkg-ruby Parses a dpkg status file(or other similarly formated file) and outputs the resulting records.  It can use  regex  on	the  field
       values to limit the returned records, and it can also be told which fields to output.  As another option, it can sort the matched fields.

OPTIONS

       -f filename
       --file filename
	      The file to parse.  The default is /var/lib/dpkg/status.

       -d [#]
       --debug [#]
	      Each time this is specified, it increased the debug level.

       -s field(s)
       --sort field(s)
	      A space or comma separated list of fields to sort on.

       -n field(s)
       --numeric field(s)
	      A space or comma separated list of fields that should be interpreted as numeric in value.

       -rs ??
       --rec_sep ??
	      Output this string at the end of each output paragraph.

       -h
       --help Display some help.

       fieldname
	      The fields from the file, that are matched with the regex given.	The fieldnames are case insensitive.

       out_fieldname
	      The  fields  from the file, that are outputted for each record.  If the first field listed is begins with ^, then the list that fol-
	      lows are fields NOT to be outputted.

BUGS

       Be warned that the author has only a shallow understanding of the dpkg packaging system, so there are probably tons of bugs  in	this  pro-
       gram.

       This  program  comes with no warranties.  If running this program causes fire and brimstone to rain down upon the earth, you will be on our
       own.

       This program accesses the dpkg database directly in places, querying for data that cannot be gotten via dpkg.

AUTHOR

       Fumitoshi UKAI <ukai@debian.or.jp>.  This manual page are based on (or almost copy from :) dpkg-awk(1) manual written by Adam  Heath  <doo-
       gie@debian.org>

DEBIAN
								 Debian Utilities						      DPKG-RUBY(1)
All times are GMT -4. The time now is 09:35 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy