Shell Programming and Scripting

00012919 7836049      S
00012920 7836049      S
00012921 3828157      Y
00012922 3828157      Y
00012923 3828157      S
T005290070331000012923

00012956 7236046      S
00012942 3458235      Y

 
 
00012919 7836049      S
00012920 7836049      S
00012921 3828157      Y
00012922 3828157      Y
00012923 3828157      S
00012956 7236046      S
00012942 3458235      Y
T005290070331000012923

awk 's{print s}{s=$0} END{system("cat file2");print s}' file1

    
#!/bin/bash
#tailer.sh
        if [ $# -lt "2" ]; then
        {
                echo "Sorry you need to pass the name of the first file followed by the name of the second file."
        }
                elif ! [ -e "$1" ] || ! [ -e "$2" ]; then
        {
                echo "Sorry I couldn't find your files"
        }
        fi
        #create a variable with the last line of the file to be augmented
        this_tail=`cat $1 | grep -v ^$ | tail -n 1`
        #output the first file, minus the last line, followed by the second file, followed by the last line of the first.
        (cat $1 | grep -v ^$ | grep -v "$this_tail") && (cat $2 | grep -v ^$) && echo $this_tail
    
exit

bash tailer.sh tailed.txt insert.txt
00012919 7836049      S
00012920 7836049      S
00012921 3828157      Y
00012922 3828157      Y
00012923 3828157      S
00012956 7236046      S
00012942 3458235      Y
T005290070331000012923