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Old 03-18-2004, 08:02 AM   #1
philipina
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Replace a string including simple quotes.


Hello,

I have a string like " '2','asds','ddqw','NULL','qwsd' "
and I would like replace 'NULL' by NULL (without quote).

I tried the next :

nullString="'NULL'"
nullString2="NULL"
#Replace "'NULL'" by "NULL" to avoid error with mysql
sed -e 's/"$nullString"/"$nullString2"/g' mysql.txt > mysql2.txt
and
sed -e 's/$nullString/$nullString2/g' mysql.txt > mysql2.txt

and this is not working, there is no difference between both files!

how can I do that.
Is it possible to directly work with the string instead of a file?

Thanks in advance.
 
Old 03-18-2004, 08:21 AM   #2
fsbooks
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Hope the following helps:

$ < mysql.txt sed s/\'NULL\'/NULL/
" '2','asds','ddqw',NULL,'qwsd' "
$ cat mysql.txt
" '2','asds','ddqw','NULL','qwsd' "
$ < mysql.txt sed s/\'NULL\'/NULL/
" '2','asds','ddqw',NULL,'qwsd' "
$
 
Old 03-18-2004, 08:38 AM   #3
philipina
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Thanks,

This is working, but only for the first 'NULL'.
Is it possible to make recursive to change all 'NULL' string in my file.

Thanks.
 
Old 03-18-2004, 08:40 AM   #4
fsbooks
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Sorry, you only had one 'NULL' in your example. What I showed should do the first 'NULL' in each line. You need to append a g ... like this:

$ <mysql.txt sed s/\'NULL\'/NULL/g
 
Old 03-18-2004, 09:01 AM   #5
philipina
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Thank it works!
 
  


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