How to replace a string in a file using another file as source?


Login or Register for Dates, Times and to Reply

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting How to replace a string in a file using another file as source?
# 1  
How to replace a string in a file using another file as source?

I have a file with two columns of alpha numeric strings, I need to replace in another file all the appearances of any string in column A with the correspondent string in column B, I tried this but it is not working:

Code:
for i in `awk '{print $1}' test_file`; do for j in `awk '{print $2}' test_file`; do sed 's/$i/$j/g' test_file1  > test_file2; done; done

as a test if I do this:

Code:
for i in `awk '{print $1}' test_file`; do for j in `awk '{print $2}' test_file`; do echo $i:$j; done; done

I got the list of strings correctly, but the replacement doesn't work

Moderator's Comments:
Mod Comment Added code tags ...

Last edited by Peter Roday; 08-29-2017 at 04:01 PM..
# 2  
Code:
awk 'FNR==NR{ a[$1] = $2; next} { for(i in a)gsub(i, a[i]) }1'  string_list_file file > outfile

Here is example to start

Code:
akshay@db-3325:/tmp$ cat string_list_file 
foo bar
jack john
me you

akshay@db-3325:/tmp$ cat file 
1 2 3 jack 5
me 2 3 foo 5
me jack foo 4 5

akshay@db-3325:/tmp$ awk 'FNR==NR{ a[$1] = $2; next} { for(i in a)gsub(i, a[i]) }1'  string_list_file file 
1 2 3 john 5
you 2 3 bar 5
you john bar 4 5

This User Gave Thanks to Akshay Hegde For This Post:
# 3  
Smilie it worked...thanks!
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 #512
Difficulty: Medium
PHP requires that all variables begin with a dollar sign, for example $flag.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Replace string of a file with a string of another file for matches using grep,sed,awk

I have a file comp.pkglist which mention package version and release . In 'version change' and 'release change' line there are two versions 'old' and 'new' Version Change: --> Release Change: --> cat comp.pkglist Package list: nss-util-devel-3.28.4-1.el6_9.x86_64 Version Change: 3.28.4 -->... (1 Reply)
Discussion started by: Paras Pandey
1 Replies

2. UNIX for Dummies Questions & Answers

Replace character string in txt file using input file(S)

Hi I have a large txt file on my AIX server and I need to replace some text using two other files. So filename1 has about 500 lines similar to: txtcode SYStem100 I have the string I want to change in string2 and the new stringname in string3. Does anyone know a way of doing this? I have... (1 Reply)
Discussion started by: Grueben
1 Replies

3. Shell Programming and Scripting

Perl script to read string from file#1 and find/replace in file#2

Hello Forum. I have a file called abc.sed with the following commands; s/1/one/g s/2/two/g ... I also have a second file called abc.dat and would like to substitute all occurrences of "1 with one", "2 with two", etc and create a new file called abc_new.dat sed f abc.sed abc.dat >... (10 Replies)
Discussion started by: pchang
10 Replies

4. Shell Programming and Scripting

Replace string in a file with some content indexed from another file.

We have two files file 1: (usually small, ~100 lines), each line contains a : separated index, value e.g 2: Apple 1: Banana 5: Pear 7: Orange File 2: (usually large, 10 million lines or more), each line contains a single string value. e.g xyz1 xyz2 xyz3 xyz4 xyz5 xyz6 xyz7 Now... (2 Replies)
Discussion started by: AlokKumbhare
2 Replies

5. Shell Programming and Scripting

replace (sed?) a string in file with multiple lines (string) from variable

Can someone tell me how I can do this? e.g: a=$(echo -e wert trewt ertert ertert ertert erttert erterte rterter tertertert ert) How do i replace the STRING with $a? I try this: sed -i 's/STRING/'"$a"'/g' filename.ext but this don' t work (2 Replies)
Discussion started by: jforce
2 Replies

6. Shell Programming and Scripting

replace (sed?) a single line/string in file with multiple lines (string) from another file??

Can someone tell me how I can do this? e.g: Say file1.txt contains: today is monday the 22 of NOVEMBER 2010 and file2.txt contains: the 11th month of How do i replace the word NOVEMBER with (5 Replies)
Discussion started by: tuathan
5 Replies

7. Shell Programming and Scripting

How to find a certain string in a file and replace it with a value from another file using sed/awk?

Hi Everyone, I am new to this forum and new to sed/awk programming too !! I need to find particular string in file1(text file) and replace it with a value from another text file(file2) the file2 has only one line and the value to be replaced with is in the second column. file 1: (assert (=... (21 Replies)
Discussion started by: paramad
21 Replies

8. Shell Programming and Scripting

find and replace a string in a file without the use of temp file

Hi - I am looking for a replacing a string in a in multiple *.sql files in directory with a new string without using a temporary file Normally I can use sed command as below for W in ls `FILE*.sql` do sed 's/OLD/NEW/g' $W > TEMPFILE.dat mv TEMPFILE.dat $W done But Here in my... (9 Replies)
Discussion started by: raghutapal
9 Replies

9. Shell Programming and Scripting

How To Replace A String In File With A String Containing Windows File Path

Hi, I have a file with the following contents # Lines that start with a # are comments. # # Calling TOAD like this will perform a comparison from command line : # # "C:\Program Files\Quest Software\Toad for Oracle 9.6\toad.exe" -c... (2 Replies)
Discussion started by: rajan_san
2 Replies

10. UNIX for Dummies Questions & Answers

how can search a String in one text file and replace the whole line in another file

i am very new to UNIX plz help me in this scenario i have two text files as below file1.txt name=Rajakumar. Discipline=Electronics and communication. Designation=software Engineer. file2.txt name=Kannan. Discipline=Mechanical. Designation=CADD Design Engineer. ... (6 Replies)
Discussion started by: kkraja
6 Replies

Featured Tech Videos