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Top Forums UNIX for Beginners Questions & Answers Replace a numeric values in a certain column Post 303031041 by arunkumar_mca on Wednesday 20th of February 2019 10:02:38 PM
Old 02-20-2019
Replace a numeric values in a certain column

Hi All,

I am trying to replace a certain value from one place in a file . In the below file at position 35 I will have 8 I need to modify all 8 in that position to 7

I tried
Code:
awk '{gsub("8","7",$35)}1' infile > outfile  ----> not working 
sed -i 's/8/7'g' infile --- it is replacing all the values  to 7 in the file.

infile:
020000492019010369200000000000000080009999005566005852006266004961000000000000000000000000
020000492019010369200012000809990080000021005566005852006266004961004100004615004490003951
020000492019010369200021131506450080000095005566005852006266004961004301006451006763006043
020000492019010369200033383653250080000121005566005852006266004961009473007622008426007768
020000492019010369200078000082160080000021005566005852006266004961004100004615004490003951
020000492019010369200078742014720080000021005566005852006266004961004100004615004490003951
020000492019010369200078742082950080000099005566005852006266004961002196002760003833002774
020000492019010369200078742104180080000099005566005852006266004961002196002760003833002774


Expected output:

020000492019010369200000000000000070009999005566005852006266004961000000000000000000000000
020000492019010369200012000809990070000021005566005852006266004961004100004615004490003951
020000492019010369200021131506450070000095005566005852006266004961004301006451006763006043
020000492019010369200033383653250070000121005566005852006266004961009473007622008426007768
020000492019010369200078000082160070000021005566005852006266004961004100004615004490003951
020000492019010369200078742014720070000021005566005852006266004961004100004615004490003951
020000492019010369200078742082950070000099005566005852006266004961002196002760003833002774
020000492019010369200078742104180070000099005566005852006266004961002196002760003833002774

Also on a follow up if I want to replace 008 to 009 . 008 is on the same column 33-35. What should I do

Last edited by arunkumar_mca; 02-20-2019 at 11:18 PM..
 

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unix2dos(1)						      General Commands Manual						       unix2dos(1)

NAME
unix2dos - UNIX to DOS text file format converter SYNOPSYS
unix2dos [options] [-c convmode] [-o file ...] [-n infile outfile ...] Options: [-hkqV] [--help] [--keepdate] [--quiet] [--version] DESCRIPTION
This manual page documents unix2dos, the program that converts text files in UNIX format to DOS format. OPTIONS
The following options are available: -h --help Print online help. -k --keepdate Keep the date stamp of output file same as input file. -q --quiet Quiet mode. Suppress all warning and messages. -V --version Prints version information. -c --convmode convmode Sets conversion mode. Simulates unix2dos under SunOS. -o --oldfile file ... Old file mode. Convert the file and write output to it. The program default to run in this mode. Wildcard names may be used. -n --newfile infile outfile ... New file mode. Convert the infile and write output to outfile. File names must be given in pairs and wildcard names should NOT be used or you WILL lost your files. EXAMPLES
Get input from stdin and write output to stdout. unix2dos Convert and replace a.txt. Convert and replace b.txt. unix2dos a.txt b.txt unix2dos -o a.txt b.txt Convert and replace a.txt in ASCII conversion mode. Convert and replace b.txt in ISO conversion mode. unix2dos a.txt -c iso b.txt unix2dos -c ascii a.txt -c iso b.txt Convert and replace a.txt while keeping original date stamp. unix2dos -k a.txt unix2dos -k -o a.txt Convert a.txt and write to e.txt. unix2dos -n a.txt e.txt Convert a.txt and write to e.txt, keep date stamp of e.txt same as a.txt. unix2dos -k -n a.txt e.txt Convert and replace a.txt. Convert b.txt and write to e.txt. unix2dos a.txt -n b.txt e.txt unix2dos -o a.txt -n b.txt e.txt Convert c.txt and write to e.txt. Convert and replace a.txt. Convert and replace b.txt. Convert d.txt and write to f.txt. unix2dos -n c.txt e.txt -o a.txt b.txt -n d.txt f.txt DIAGNOSTICS
BUGS
The program does not work properly under MSDOS in stdio processing mode. If you know why is that so, please tell me. AUTHOR
Benjamin Lin - ( blin@socs.uts.edu.au ) MISCELLANY
Tested environment: Linux 1.2.0 with GNU C 2.5.8 SunOS 4.1.3 with GNU C 2.6.3 MS-DOS 6.20 with Borland C++ 4.02 Suggestions and bug reports are welcome. SEE ALSO
dos2unix(1) 1995.03.31 unix2dos v2.2 unix2dos(1)
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