Replacing space with T only in the 1st line of the file

Shell Programming and Scripting
1

Hi Masters ,

I have a file whose header is like
HDRCZECM8CZCM000000881 SVR00120100401160828+020020100401160828+0200CZK

There is a space between 1 and S ,my req is to chng the space to T

I tried echo `head -1 CDCZECM8CZCM000000881` | sed 's/ /T/'
it works ,but how can I modify in the original file.

Thanks in advance

2 
awk 'NR==1{sub(" ","T")}1' file > file.tmp; mv file.tmp file
3

Hi bartus11 ,

thanks a lot for your reply.

However i am facing following error:
awk: syntax error near line 1
awk: illegal statement near line 1
awk: syntax error near line 1
awk: bailing out near line 1

Can you please suggest

4

use nawk or /usr/xpg4/bin/awk (guessing you're on Solaris)

5

Its working .

Thanks a lot to both of you...:slight_smile:

6

sed '1s/ /T/' file