Shell Programming and Scripting

`awk '{print $2 $3 $4 $5}' | grep '[0-9]' | awk '{sum+=$1} END {print sum}'`
awk '{print $2 $3 $4 $5}' #Greps the 2nd till 5th column 
grep '[0-9]' #Finds only the numbers
awk '{sum+=$1} END {print sum}' #sums up all the numbers.. Here am bit confused since doesnt print the exact values correctly

$ awk '{print $2 $3 $4 $5}' marks.txt
LIST

englishfrenchchineselatin
34456723
12391056
23902378

$ awk '{print $2, $3, $4, $5}' marks.txt
LIST

english french chinese latin
34 45 67 23
12 39 10 56
23 90 23 78

$ awk '{print $2 + $3 + $4 + $5}' marks.txt
0
0
0
169
117
214

# awk '{print $2+$3+$4+$5}' marks.txt
0
0
0
169
117
214

# cat marks.txt
        MARKS LIST
     2013
Name english french chinese latini total
wer   34         45     67      23
wqa   12         39     10      56
wsy   23         90     23      78

$ awk 'NF == 5 {print $2+$3+$4+$5}' marks.txt
169
117
214