How to append data to the first line of an existing file

swatisurana2 · #1 (**permalink**) 03-02-09, 03:53

I have a file named "abc.h.data"

Its contents are

HDR20090113
abcde
adcerty
gtyhsrd
...
TRL20090113

What I want is to add the filename (i.e. abc.h.data) to the end of the first line so that content looks like the following

HDR20090113abc.h.data
abcde
adcerty
gtyhsrd
...
TRL20090113

also, I am reading the filename from command line.

Kindly help

Thanks

pdreyer · #2 (**permalink**) 03-03-09, 01:43

Code:

f=abc.h.data
mv $f $f.old
sed '1 s/$/'$f'/' $f.old >$f

stolze · #3 (**permalink**) 03-03-09, 06:42

You can additionally use sed's -i or --in-place option.

pdreyer · #4 (**permalink**) 03-03-09, 07:54

Not available on my system

# sed -i
sed: illegal option -- i

stolze · #5 (**permalink**) 03-04-09, 04:08

Oh, I assumed that pretty much everyone is using the GNU tools these days...

mike_bike_kite · #6 (**permalink**) 03-04-09, 04:34

Quote:

What I want is to add the filename (i.e. abc.h.data) to the end of the first line so that content looks like the following

I couldn't understand why he would want to add the filename to the file in the first place. Deciding to append it to the end of the first row with no separator just seems like creating work for yourself (well others in this case ) unless it's coursework.

sundeepsharma · #7 (**permalink**) 03-09-09, 11:38

Suppose your file name is abc.dat then you cn use
awk '{ if(NR==1) {print $0 FILENAME} if(NR>1) print $0 }' abc.dat

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