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Shell Programming and Scripting

Replace in KSH

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# 1  
Old 06-13-2011
Tools Replace in KSH
Hello,

i want to replace a string AAAA to BBB in a file using script.
File:
Code:
1
2
AAAA
3
4
5

Code:
old=AAAA
new=BBB
cat $file_name | while read line;
do
    if [ "$line" = "AAAA" ];then
       sed -e 's/$old/$new/'
    fi
done

HELP
Last edited by Franklin52; 06-13-2011 at 10:27 AM.. Reason: Correcting code tags
# 2  
Old 06-13-2011
Code:
awk -vo="AAAA" -vn="BBB" '{sub (o,n,$0)}1' $file_name

If you want to edit the file in place, then try:
Code:
perl -i -0pse 's/$o/$n/g' -- -o="AAAA" -n="BBB" $file_name

# 3  
Old 06-13-2011
No need to use a loop:
Code:
old=AAAA
new=BBB

sed "s/$old/$new/" $file_name > new_file

# 4  
Old 06-13-2011
Thanks for the reply but the file is being copied to the new file without changing the required field.
meaning file is the same.
I used :
Code:
sed 's/$old/$new/' $file_name > new_file

Last edited by Franklin52; 06-13-2011 at 10:42 AM.. Reason: Please use code tags
# 5  
Old 06-13-2011
Use double quotes:

Code:
sed "s/$old/$new/" $file_name > new_file

# 6  
Old 06-13-2011
When using double cthe new file is created with 0 kb size.
when using singal double quotes the file is created the same as the orig file.

---------- Post updated at 05:15 PM ---------- Previous update was at 04:44 PM ----------

Works.
Sorry.
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