UNIX for Dummies Questions & Answers

1.1
1.2
1.3
5.5
1.4
1.5
1.6

1 a
2 B
3 C
4 D
5 z
6 F
7 G
8 H
9 I
10 J
11 K
12 L
13 M
14 N
15 O
16 P
17 Q
18 R
19 S
20 T

a
a
a
z
a
a
a

awk 'NR==FNR{a[int($1+.5)];next} $1 in a {print $2}' file1 file2

a
z

while read line
do
   num=`echo ${line} | awk -F "." ' { print $1 } '`
   egrep "^${num} " file2  | cut -d" " -f2 >> output
done < file1

awk 'NR==FNR{A[$1]=$2;next} {i=int($1+.5)} i in A {print A[i]}' file2 file1

awk 'NR==FNR{A[$1]=$2;next} {i=int($1+.5);print A[i]}' file2 file1

688   6.42
689   missing
690   6.42

689.52
688.867
688.935
688.32

689.52  6.42
688.867 6.42
688.935 6.42
688.32  6.42

awk 'NR==FNR{if(!i)i=$1; while(i<=$1)A[i++]=$2;next} {print A[int($1+.5)]}' fileB.txt fileA.txt