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UGU: Unix Guru Universe - Unix Tip #4332- January 20, 2025
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Unix Tip #4332- January 20, 2025
ARITHMETIC COMPARISON
In UNIX shell arithmetic comparison
is limited to integer values. Here
is a tip to compare floating values
using basic shell commands.
--------- CUT HERE-----------------
#! /bin/sh
# test shell script
n1="01.401"
n2="01.350"
function compareFloatSmall
{
sort -n <<: | head -1
$n1
$n2
:
}
function compareFloatGreat
{
sort -r -n <<: | head -1
$n1
$n2
:
}
small=$(compareFloatSmall $n1 $n2)
echo "Comparing $n1 to $n2: smaller $less"
great=$(compareFloatGreat $n1 $n2)
echo "Comparing $n1 to $n2: greater $great"
--------- CUT HERE-----------------
Alternatively you can use a small 'awk' program.
--------- CUT AGAIN HERE-----------
#! /bin/sh
# A couple of examples in awk.
n1="03.550"
n2="02.550"
echo "$n1 $n2" | awk '{
if ( $1 >= $2 ) print $1
if ( $1 <= $2 ) print $2
if ( $1 > $2 ) print $1
if ( $1 < $2 ) print $2
if ( $1 == $2 ) print $1, $2
}'
--------- CUT AGAIN HERE-----------
This tip generously supported by: sthackeray@netscape.net
NOTE: All tips provided are USE AT YOUR OWN RISK. Tips are submitted
by various unix admins around the globe. UGU suggest you read and
test each tip in a non-volitile environment before placing into
production.
LAST 5 TIPS
4331
- COPY A TREE WITH CPIO
4330
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4329
- ANOTHER SORT BY FILE SIZE
4328
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4327
- LOCK DOWN TELNET OR FTP
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