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

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# 1  
Old 09-06-2010
Replacing space with T only in the 1st line of the file
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  
Old 09-06-2010
Code:
awk 'NR==1{sub(" ","T")}1' file > file.tmp; mv file.tmp file

# 3  
Old 09-06-2010
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  
Old 09-06-2010
use nawk or /usr/xpg4/bin/awk (guessing you're on Solaris)
# 5  
Old 09-06-2010
Its working .

Thanks a lot to both of you...Smilie
# 6  
Old 09-06-2010
sed '1s/ /T/' file
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