UNIX for Dummies Questions & Answers

Hi

I have a number of sequences and a string occurs a number of times in that sequence.

How can I select and replace only those strings which are followed by \tab.

for eg :
my sequence looks like :

string0 positive cd parent=string0 id =121 string0
string0 negative ef parent= string0 id =121 string0

I want it to look like
char7 positive cd parent=string0 id =121 string0
char7 negative ef parent= string0 id =121 string0

I want to replace string0 by char7 but only for those followed by \tab
i dont want to replace the string0 in parent and in that id

I am very new into programming so would like some command which is easy to understand

Thanks a lot!!

Try the below example:

Code:

$ cat t
string0 positive cd parent=string0 id =121 string0
string0 negative ef parent= string0 id =121 string0

$ sed 's/^string0\t/char7\t/' t
char7   positive cd parent=string0 id =121 string0
char7   negative ef parent= string0 id =121 string0

Thanks it worked!!