Q:

How to combine files

I have two files.
first file:
45  76
77  23
12  93
77  10
82  92

second file:
89
37
84
10
93

I want to combines them in one file
like this
89  45  76
37  77  23
84  12  93
10  77  10
93  82  92

A:

With paste: 
$ paste file2 file1
89  45  76
37  77  23
84  12  93
10  77  10
93  82  92

With pr:
$ pr -mts'  ' file2 file1
89  45  76
37  77  23
84  12  93
10  77  10
93  82  92

With awk:
$ awk 'NR==FNR{a[NR]=$0;next}{print a[FNR],$0}' OFS='  ' file2 file1
89  45  76
37  77  23
84  12  93
10  77  10
93  82  92

