Редактирование строк

sed = ex.txt|sed 'N;s/\n/ /;s/\([0-9]*\) \(.*\)/\2.tk\1/'

sed = | sed -n 'h;n;G;s/\n/\.tk/;p'

$cat file1
aaa
bbb
ccc

$cat file2
ddd
eee
fff

$ cat file1
aaa
bbb
ccc
$ cat file2
ddd
eee
fff
$ a=1; while read f1 && read f2 <&2; do echo "$f1 $f2 $a"; a=$(($a + 1)); done <file1 2< file2
aaa ddd 1
bbb eee 2
ccc fff 3

a=1; while read f1; do sed -e "s/\(.*\)/$f1\1/" file2 >newfile$a; a=$(($a + 1)); done <file1

$cat newfile1
aaa
bbbddd
ccc
$cat newfile2
aaa
bbbeee
ccc
$cat newfile3
aaa
bbbfff
ccc

$ a=1; while read f2; do sed -e "1,/.*/{n;s/\(.*\)/\1$f2/}" file1 >newfile$a; a=$(($a + 1)); done <file2
$ cat newfile[1-3]
aaa
bbbddd
ccc
aaa
bbbeee
ccc
aaa
bbbfff
ccc

xargs -i awk -v l={} 'NR == 2 {$0 = $0 l}; 1' file1 < file2