Replace string in column


Login or Register for Dates, Times and to Reply

 
Thread Tools Search this Thread
# 1  
Replace string in column

Hi,

I want to replace string in column,Example i have file caleed a1.txt ,want to replace string "A12" with "A23" only in column2 ,not from file itself.Using sed command replace string in file itself.


Thanks,
Mohan
# 2  
Try...
Code:
awk '{sub("A12","A23",$2);print}' a1.txt

# 3  
cat al.txt| cut -f2 |sed -e 's/A12/A23/g' .......... this may work i m not sure.
This User Gave Thanks to uniesh For This Post:
# 4  
Quote:
Originally Posted by uniesh
cat al.txt| cut -f2 |sed -e 's/A12/A23/g' .......... this may work i m not sure.
This wont work if you have multiple entries of A12 in some other column other than 2nd column

Code:
$ cat sampfile
1 A12 A12
2 A99 20
3 A34 30
4 A45 40
5 A12 50
 
$ cat sampfile| cut -f2 |sed -e 's/A12/A23/g'
1 A23 A23
2 A99 20
3 A34 30
4 A45 40
5 A23 50

And moreover if you are specifying a field dont forget to specify the delimiter as the default delimiter for cut is tab and not space...

As you can see from below...

Code:
$ cat sampfile
1 A12 A12
2 A23 20
3 A34 30
4 A45 40
5 A12 50
 
$ cat sampfile| cut -f2
1 A12 A12
2 A23 20
3 A34 30
4 A45 40
5 A12 50

No difference b/w 1st and 2nd command

Code:
$ cat sampfile| cut -d " " -f2
A12
A23
A34
A45
A12

The above makes some sense but he doesnt want to just print one column and make changes... he needs to make changes in entire file...
Login or Register for Dates, Times and to Reply

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

Test Your Knowledge in Computers #718
Difficulty: Medium
Alan Minsky invented the first head-mounted graphical display in 1933.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How to search and replace string from nth column from a file?

I wanted to search for a string and replace it with other string from nth column of a file which is comma seperated which I am able to do with below # For Comma seperated file without quotes awk 'BEGIN{OFS=FS=","}$"'"$ColumnNo"'"=="'"$PPK"'"{$"'"$ColumnNo"'"="'"$NPK"'"}{print}' ${FileName} ... (5 Replies)
Discussion started by: Amit Joshi
5 Replies

2. Shell Programming and Scripting

How to search and replace string in column in file with command sed?

how to search and replace string in column in file with command sed or other search "INC0000003.in" and replace column 4 = "W" $ cat file.txt INC0000001.in|20150120|Y|N|N INC0000002.in|20150120|Y|N|N INC0000003.in|20150120|Y|N|N INC0000004.in|20150120|Y|N|Noutput... (4 Replies)
Discussion started by: ppmanja3
4 Replies

3. Shell Programming and Scripting

Replace pipe delimited column string to null

Hi All, I have a large dat file where each lines are pipe delimited values. I need to parse the file depending on the request. For example: sometimes I have told to remove all the values in the 7th column (this case remove values '3333' only from the first line and '3543' from the second line)... (4 Replies)
Discussion started by: express14
4 Replies

4. Shell Programming and Scripting

Replace specific column range in a non-delimited file with a string!

Hi All, I will need an help with respect to replacing a range of columns on a non-delimited file using a particular string pattern. Say file input is MYNUMBERD000000-BAN CHUE INSNTS ** N+ MYAREDSDD000000+BAN CHUE INSNTS ** N+ MYDERFFFSD00000-GIR PENT - ACH ** ... (5 Replies)
Discussion started by: navojit dutta
5 Replies

5. Shell Programming and Scripting

sed or awk command to replace a string pattern with another string based on position of this string

here is what i want to achieve... consider a file contains below contents. the file size is large about 60mb cat dump.sql INSERT INTO `table1` (`id`, `action`, `date`, `descrip`, `lastModified`) VALUES (1,'Change','2011-05-05 00:00:00','Account Updated','2012-02-10... (10 Replies)
Discussion started by: vivek d r
10 Replies

6. Shell Programming and Scripting

Replace 2nd column for each line in a csv file with fixed string+random number

Hi experts, My csv file looks like this U;cake;michael;temp;;;; U;bread;john;temp;;;; U;cocktails;sarah;temp;;;; I'd like to change the value fo 2nd column to cf+random number , which will look maybe something like this U;cf20187;michael;temp;;;; U;cf8926;john;temp;;;;... (7 Replies)
Discussion started by: tententen
7 Replies

7. Shell Programming and Scripting

Replace empty string on particular column

Hi I would like to replace empty string with a particluar value, any suggessions with awk ? my input file is not delimited with any delimiters input 52001073M8000000004567777 5200107 000000004567778 5200107 000000004567779 52001073M8000000004567789 Expected output... (5 Replies)
Discussion started by: selvankj
5 Replies

8. Shell Programming and Scripting

Match column 3 in file1 to column 1 in file 2 and replace with column 2 from file2

Match column 3 in file1 to column 1 in file 2 and replace with column 2 from file2 file 1 sample SNDK 80004C101 AT XLNX 983919101 BB NETL 64118B100 BS AMD 007903107 CC KLAC 482480100 DC TER 880770102 KATS ATHR 04743P108 KATS... (7 Replies)
Discussion started by: rydz00
7 Replies

9. UNIX for Dummies Questions & Answers

Search and replace string only in a particular column in a delimited file

I have file with multiple columns. Column values for a record may be same. Now i have to replace a column value(this can be same for the other columns) with new value. File.txt A,B,C,D,A,B,C,D,A,B,C,D A,B,C,D,A,B,C,D,A,B,C,D A,B,C,D,A,B,C,D,A,B,C,D A,B,C,D,A,B,C,D,A,B,C,D... (1 Reply)
Discussion started by: ksailesh
1 Replies

10. UNIX and Linux Applications

Replace string in unix from 10th column onwards

Hi All, I need to replace the last 19 bytes of the following string My_Org_Testing_20090102_231124.txt (Text_Date_Time.txt). I would like to derive the current time using "date +%Y%m%d_%H%M%S.txt" and replace the last 19 bytes of the above string I would appreciate if someone could... (3 Replies)
Discussion started by: rpk2008
3 Replies

Featured Tech Videos