What is the command to add heading to a file?

whatisthis · #1 (**permalink**) 11-09-2005

Hi,
I'd like to add one line to the top of my file.
I know there is a command to be able to do it.
But I forgot ......

Please help if you can ....

flyingpenguin · #2 (**permalink**) 11-09-2005

I don't know a specific command, but this one liner works fine in sh, bash, and tcsh (a bunch of other shells too):

Code:

( echo "Line to add" ; cat targetfile ) > tempfile ; cat tempfile > targetfile ; rm -f tempfile

Where targetfile is the file you're trying to add one line to.

zazzybob · #3 (**permalink**) 11-09-2005

Code:

sed '1 i\
Line to insert here' infile > outfile

Press Enter after the \ and then continue on the next line, exactly as indicated above.

Cheers
ZB

npn · #4 (**permalink**) 12-02-2005

existing file filename "file_one.dat"

which contains
AMITH
ARUN
ARVIND

I am adding "I LOVE PIZZA" in the first line of this file

Here it is:
echo "I LOVE PIZZA" | cat > tempfile ; cat file_one.dat >> tempfile ; mv tempfile file_one.dat

Result:
I LOVE PIZZA
AMITH
ARUN
ARVIND

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