append a line to the last line in a file

Applications UNIX Desktop Questions & Answers
1

Suppose i have a file "xyz.txt" which contains

abcdef
ghijklm
nop

Now in want to add "qrst" to the last line such that the file becomes

abcdef
ghijklm
nopqrst

P.S:The o/p i need is
abcdef
ghijklm
nopqrst (and not) nop
qrst

2

Try this..

echo "$(cat file)qrst" >temp
mv temp file

O/p:
cat file
abcdef
ghijklm
nop
echo "$(cat file)qrst"
abcdef
ghijklm
nopqrst

3

Using sed

$ cat xyz.txt
abcdef
ghijklm
nop
$ sed '$ a\qrst' xyz.txt
abcdef
ghijklm
nop
qrst
$ sed '$ a\qrst' xyz.txt > abc.txt
$ mv abc.txt xyz.txt
$ cat xyz.txt
abcdef
ghijklm
nop
qrst
$
4

I seem to have misunderstood the requirement. Hope below is the required soln.

$ sed '$ s/^\(.*\)$/\1qrst/' xyz.txt
abcdef
ghijklm
nopqrst
5 
awk '{ printf "\n%s", $0 }END{ printf "abcdefghijkl\n" }' filename
6

sed '$s/$/&qrst/' input_file