Problem with sed

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# 1  
Old 09-25-2011
Problem with sed

I need to insert, or replace a character at a designated row and column in a text file with sed. Heres the code:

sed "${row} s/./${newchar}/${col}" >test.txt

Everytime I use this code on cygwin, It doesn't work, it just has me input text without an end.

So why isn't it working?

Also, how I can put a variable in the "row", "newchar", and "col", area so it can move to a script designated spot in the text file?
# 2  
Old 09-25-2011
can you post your thread with example that really helpful to everyone.
# 3  
Old 09-25-2011
The example is on my first post
# 4  
Old 09-25-2011
Your example does not use an input file
# 5  
Old 09-25-2011
sed "${3} s/./${\n}/${10}" <test.txt >test.txt

# 6  
Old 09-25-2011
The >test.txt shell redirection truncates test.txt before sed is even invoked. You need to use a temp file for that (even if it's implicit, such as via gnu sed's -i).

# 7  
Old 09-25-2011
${col} doesn't mean that it will replace in the column you have specified. For eg:-
sed '3 s/you/me/4' file

The above code means, replace "you" with "me" in line #3 for the fourth occurrence of "you" and not in fourth column.

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