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January 6, 2017 01:12
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Bash function for testing an IPv4 address
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| is_ipv4() { | |
| local -r regex='^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$' | |
| [[ $1 =~ $regex ]] | |
| return $? | |
| } |
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| is_ipv4 $ip | |
| if [ "$?" -ne 0 ] | |
| then | |
| echo "[x] $ip is not an IPv4" | |
| exit 1 | |
| fi |
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