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Top Forums Shell Programming and Scripting Finding a text in files & replacing it with unique strings Post 302761521 by gordom on Friday 25th of January 2013 07:43:11 PM
Old 01-25-2013
Finding a text in files & replacing it with unique strings

Hallo Everyone.
I have to admit I'm shell scripting illiterate . I need to find certain strings in several text files and replace each of the string by unique & corresponding text.
I prepared a csv file with 3 columns: <filename>;<old_pattern>;<new_pattern>

Code:
dominik@dominik-VirtualBox:~/Pulpit/test/1$ cat file.csv
 file1.txt;abc;123
 file2.txt;XYZ;6789

A very kind guy (much more skilled than me) helped me with the script:

Code:
dominik@dominik-VirtualBox:~/Pulpit/test/1$ cat script.sh
 for i in `cat file.csv`; do
 file=`echo $i | cut -d ";" -f1`;
 pattern1=`echo $i | cut -d ";" -f2`;
 pattern2=`echo $i | cut -d ";" -f3`;
 sed -i "s/$pattern1/$pattern2/" $file;
 done

To find & replace text I run the script and grep:

Code:
dominik@dominik-VirtualBox:~/Pulpit/test/1$ bash script.sh
dominik@dominik-VirtualBox:~/Pulpit/test/1$ grep . file{1,2}*

With the above file.csv example the script works fine and do what's intended. The problem starts if <old_pattern> and <new_pattern> text have white spaces:

Code:
dominik@dominik-VirtualBox:~/Pulpit/test/1$ cat file.csv
 file1.txt;abc jkl nm;1 2 3
 file2.txt;XYZ rt;67 89

In that case script returns errors.I tried to modify file.csv by putting text between quotation marks but it didn't help. How the script should be adjusted to work with text consisting of white spaces? I would appreciate any help from you. Thank you very much in advance. Regards,
gordom

Last edited by gordom; 01-28-2013 at 09:20 AM.. Reason: deleting text formatting
 

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DIFF(1) 						      General Commands Manual							   DIFF(1)

NAME
diff - differential file comparator SYNOPSIS
diff [ -efbh ] file1 file2 DESCRIPTION
Diff tells what lines must be changed in two files to bring them into agreement. If file1 (file2) is `-', the standard input is used. If file1 (file2) is a directory, then a file in that directory whose file-name is the same as the file-name of file2 (file1) is used. The normal output contains lines of these forms: n1 a n3,n4 n1,n2 d n3 n1,n2 c n3,n4 These lines resemble ed commands to convert file1 into file2. The numbers after the letters pertain to file2. In fact, by exchanging `a' for `d' and reading backward one may ascertain equally how to convert file2 into file1. As in ed, identical pairs where n1 = n2 or n3 = n4 are abbreviated as a single number. Following each of these lines come all the lines that are affected in the first file flagged by `<', then all the lines that are affected in the second file flagged by `>'. The -b option causes trailing blanks (spaces and tabs) to be ignored and other strings of blanks to compare equal. The -e option produces a script of a, c and d commands for the editor ed, which will recreate file2 from file1. The -f option produces a similar script, not useful with ed, in the opposite order. In connection with -e, the following shell program may help maintain multiple versions of a file. Only an ancestral file ($1) and a chain of version-to-version ed scripts ($2,$3,...) made by diff need be on hand. A `latest version' appears on the standard output. (shift; cat $*; echo '1,$p') | ed - $1 Except in rare circumstances, diff finds a smallest sufficient set of file differences. Option -h does a fast, half-hearted job. It works only when changed stretches are short and well separated, but does work on files of unlimited length. Options -e and -f are unavailable with -h. FILES
/tmp/d????? /usr/lib/diffh for -h SEE ALSO
cmp(1), comm(1), ed(1) DIAGNOSTICS
Exit status is 0 for no differences, 1 for some, 2 for trouble. BUGS
Editing scripts produced under the -e or -f option are naive about creating lines consisting of a single `.'. DIFF(1)
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