处理文件最后一行

abcd  1234    fds
2011  550
1023  832er  1231

处理后：

abcd            1234       fds
2011            550
total1:1023   total2:832er      12end

判断如果是文本最后一行则在第一列前面加total1:,第二列加total2:, 第三列后面减掉后面两个字符并加end

sed：

echo 'abcd  1234    fds
2011  550
1023  832er  1231' |sed -r '$s/([^ ]*)(  )([^ ]*)(  )(..).*$/total1:\1\2total:\3\4\5end/'
abcd  1234    fds
2011  550
total1:1023  total:832er  12end

awk：

awk 'NR>1{print a}{a=$0}END{$1="total1:"$1;$2="total2:"$2;print gensub(/..$/,"end",$0)}' file

awk 'BEGIN{getline a}{print a;a=$0}END{$1="total1:"$1;$2="total2:"$2;$3=gensub(/..$/,"end",1,$3);print}'

awk '{if(!getline line){print "total1:"$1"  total2:"$2"  "gensub(/..$/,"end",1,$3)}else{print line?$0 RS line:$0}}'