Соединить строчки

#!/bin/bash
FILE1=file1
FILE2=file2
TOTAL_LINES=$(cat $FILE1 | wc -l)
LINE=1
while [ $LINE -le $TOTAL_LINES ]; do
        echo $(sed -n $LINE'p' $FILE1) $(sed -n $LINE'p' $FILE2)
        let LINE=LINE+1
done

$ cat file1
string1
string2
$ cat file2
string11
string22
$ ./fconcat.sh 
string1 string11
string2 string22

$ cat file1
string1
string2
$cat file2
string11
string22
$ paste file1 file2 > file3
$cat file3
string1 string11
string2 string22
$cut -f1 file3
string1
string2

$ awk '{print $1}' file3 > new_file1
$ awk '{print $2}' file3 > new_file2

$ awk 'BEGIN {FS=";"} {print $1}' file3 > new_file1
# или, как вариант
$ cat file3 | awk 'BEGIN {FS=";"} {print $2}' > new_file2

awk '{print $1; print $2 > "new_file2"}' file3 > new_file1