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Shell Programming and Scripting

Insertion of Header record

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# 1  
Old 08-13-2008
Insertion of Header record
A header record is to be inserted in the begining of a flat file without using extra file or new file. It should be inserted into same file. Advace thanks for all help...
# 2  
Old 08-13-2008
echo "`awk 'NR==1 {sub(/^/, "Header Record\n") }; {print}' file`" > file
# 3  
Old 08-13-2008
Code:
awk '{if(NR > 1) print;else printf "This is a Header\n%s",$0}' file

# 4  
Old 08-14-2008
not exactly working
thanks for the help.... but that is not writing into file instead printing on screen.
# 5  
Old 08-14-2008
That's really a separate issue. Write the output to a temporary file, then move it on top of the original.

Code:
commands file >temp
mv temp file

# 6  
Old 08-14-2008
This puts a header into the top of a file without using a temp file...
Code:
awk '{a[NR]=$0}END{close(FILENAME);a[0]=h;for(i=0;i<=NR;i++)print a[i]>FILENAME}' h="Header" file

# 7  
Old 08-14-2008
Didn't you try my script?????Smilie
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