redirect output to another file

preetham.66666 · 01-14-2015, 03:57 AM

Hi,

I want to append output to another file exactly at scecond line

I know below command will work
sed '2 i whatever_line_of_text_you_wanted_to_INSERT' filename.txt

But i want to append output of echo command to second line of my file

Below command is not working
echo "11" | sed '2 i whatever_line_of_text_you_wanted_to_INSERT' filename.txt

Please help me.

pan64 · 01-14-2015, 07:07 AM

in bash the redirect operator is >, if you want to append you will need to use >> .
so:

Code:

first command > file
second command >> file

is the way
http://wiki.bash-hackers.org/howto/redirection_tutorial

veerain · 01-14-2015, 07:33 AM

Code:

head -n 1 inp_file > out_file;

lines=`cat inp_file | wc -l`;

lines=$((lines-1));

tail -n $lines inp_file > tmp_file;

echo "11" >> out_file;

cat tmp_file >> out_file;

rm tmp_file