Saturday, August 23, 2008
Subdivide an ip address - awk and eval
The purpose is quite simple! We need to assign each field in an IP address to separate variables.
e.g.
$ IP="172.21.60.1"
The way:
$ eval $(echo "$IP" | awk '{print "IP1="$1";IP2="$2";IP3="$3";IP4="$4}' FS=.)
So, just to confirm.
$ echo $IP1
172
$ echo $IP2
21
$ echo $IP3
60
$ echo $IP4
1
Making it more generic:
$ eval $(echo "$IP" | awk '{for(i=1;i<=NF;i++) printf "IP%s=%s\n",i,$i}' FS=.)
Related post: awk and eval
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2 comments:
since you're using bash, you don't need awk and eval
IP="12.13.14.15"
set ${IP//./ }
echo "$1 - $2 - $3 - $4"
12 - 13 - 14 - 15
or if you don't want to use 'set' (want to preserve cmdline args)
ary=(${IP//./ })
echo "${ary[0]} ; ${ary[1]} ; ${ary[2]} ; ${ary[3]}"
12 ; 13 ; 14 ; 15
@dmw, thanks for the bash solution.
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