Shell Programming and Scripting

Name: abc
Val = 58
Name: cdf
Val = 1;
..................

Name: abc
Val = 58
Name: cdf
Val = 7;
..................

abc  58    58     0
cdf  1      7    -6
....................

awk -F"=|:" 'NR==FNR{x=$2;getline;a[x]=$2+0;next} 
{x=$2;getline;val=$2+0; printf("%-s\t%-3d\t%-3d\t%-3d\n",x,a[x],val,a[x]-val)}' file1 file2

root@bt:/tmp# cat file1
Name: abc
Val = 58
Name: cdf
Val = 1;

root@bt:/tmp# cat file2
Name: abc
Val = 58
Name: cdf
Val = 7;

root@bt:/tmp# awk -F"=|:" 'NR==FNR{x=$2;getline;a[x]=$2+0;next} 
{x=$2;getline;val=$2+0; printf("%-s\t%-3d\t%-3d\t%-3d\n",x,a[x],val,a[x]-val)}' file1 file2

 abc    58     58     0  
 cdf    1      7      -6

nawk 'FNR==NR{if($1~/^Name/)f1n=$NF; else f1v[f1n]=$NF+0;next} {if($1~/^Name/)f2n=$NF;else print f2n, f1v[f2n], $NF+0, f1v[f2n] - $NF}' OFS='\t' file1 file2

awk '/^Name/{n=$2;getline<f}/^Val/{x=$NF+0; getline<f; print n,x+0,$NF+0,x-$NF}' OFS='\t' f=file2 file1

paste file1 file2| awk '{n=$2; getline; print n,$3+0,$6+0,$3-$6}' OFS='\t'

awk 'END{for(i in a) print i,a[i],b[i]}{x=$NF;getline;y=int($NF);a[x]=a[x]?a[x] OFS y:y;b[x]=b[x]?b[x]-y:y}' OFS=\\t file[1,2]
abc     58      58      0
cdf     1       7       -6