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Append string to first line of a file

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# 1  
Old 07-06-2011
Append string to first line of a file
Hi,

Please suggest me to write unix command, HEADER20110101 string append to first line of a file..

Regards
Akshu
# 2  
Old 07-06-2011
i am adding 123 in the first line of the file called test
Code:
 
 
$ nawk ' { if (NR==1){printf("123%s\n",$0)} else {print} }' test 
123abc
abc
abc
abc
abc

$ cat test
abc
abc
abc
abc
abc

---------- Post updated at 11:50 AM ---------- Previous update was at 11:48 AM ----------

using sed

Code:
 
$ sed ' 1 s/.*/123&/' test
123abc
abc
abc
abc
abc

This User Gave Thanks to itkamaraj For This Post:
akshu.agni
# 3  
Old 07-06-2011
Alternate awk..
Code:
awk 'NR==1{$0="header\n"$0}1' inputfile

This User Gave Thanks to michaelrozar17 For This Post:
akshu.agni
# 4  
Old 07-06-2011
Hi,

Try this:
Code:
sed -i '1s/.*/ HEADER20110101&/' a.txt

Last edited by Franklin52; 07-06-2011 at 02:17 PM.. Reason: Please use code tags, thank you
This User Gave Thanks to gprashant For This Post:
akshu.agni
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