UNIX for Dummies Questions & Answers

That will work only for the last value. Because everytime in the loop,the input.tab is not changed.

if we are using -i in the sed, it will change input.tab itself.

i dont know, what version of sed and which OS you are using.

I tried that to overwrite on the original input.tab file:

Code:

while read a b
do
     sed -i ' ' 's/$a/$b/g' input.tab
done < table.tab

But doesn't change anything neither

if you use single quote in the sed '

then, it will not evaluate the $a and $b values.

so, it search for $a and replce it to $b

Ok, it is clear for me now.

Thanks a lot itkamaraj !

---------- Post updated at 02:14 AM ---------- Previous update was at 12:50 AM ----------

It doesn't work actually !

Because it takes the number character by character, for example:
12 is converted to AAA_alpha (correct)
35 is converted to MKIUY_gamma (correct)
but
1235 is converted to AAA_alphaMKIUY_gamma (i.e. 12 then 35)
instead of NJU_zulu (the equivalent in text of the whole number 1235)

try this..

Code:

 
sed "s/\<$a\>/$b/g" input.tab

Nope !

The input file is unchanged.

what you tried,
Did you get any error ?

i dont have any magical eyes to see, what you tried and what you got it as output.

so, post everything, then only we get to know, what you have been tried and why it is not working

---------- Post updated at 02:38 PM ---------- Previous update was at 02:34 PM ----------

Code:

 
$ cat test.txt
123456
12
34
 
$ sed 's/\<12\>/AA/g' test.txt
123456
AA
34