Shell Programming and Scripting

awk '{for(i=1; i<NF; i++) {if($i > -1 && $i < 1) {printf "A "} else if($i > -2 && $i < -1 && $i >1 && \
$i < 2)  {printf "B "} else if($i > -3 && $i < -2 && $i > 2 && $i < 3) {printf "C "} else \
{printf "D "}}} {print "\n"}' inputfile > outputfile

#!/usr/bin/env sh

# @(#) s1	Demonstrate if structure and tests.

set -o nounset
echo

## Use local command version for the commands in this demonstration.

set +o nounset
echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version "=o" $(_eat $0 $1) awk
set -o nounset

echo

FILE=${1-data1}
echo " Input file $FILE:"
cat $FILE

# Use nawk or /usr/xpg4/bin/awk on Solaris.

echo
echo " Results from awk:"
awk '
 # { print "line " NR " is " $0 }
 { for (i = 1; i <= NF; i++) {
     # print " Field " i " is " $i
     if ($i > -1 && $i < 1) {
       printf "A "
     }
     # else if ($i > -2 && $i < -1 && $i > 1 && $i < 2) {
     else if ($i > -2 && $i < 2) {
       printf "B "
     }
     # else if ($i > -3 && $i < -2 && $i > 2 && $i < 3) {
     else if ($i > -3 && $i < 3) {
       printf "C "
     }
     else {
       printf "D "
     }
   }
 }
 {printf "\n"}
' $FILE

exit 0

% ./s1

(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0 
GNU bash, version 3.2.39(1)-release (x86_64-pc-linux-gnu)
GNU Awk 3.1.5

 Input file data1:
-3
-2
-1
0
1
2
3

 Results from awk:
D 
C 
B 
A 
B 
C 
D