Validating an ip address in a bash script

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Click Here to receive this Complete Guide absolutely free. I have a question foy those who can/wants to help me out.

I want to build a bash script, which can ping a range IP adresses which will be filled in by the admin.

For example, are they fixed IP addresses or are they assigned dinamically through DHCP?

You may always ping the whole IP range of the subnet from 1 to 254, but...

If I have missed the point or am confused (easily done sometimes ) please advise where my thinking has gone astray?

Hey PT, Yes I am open to suggestion as I am a novice to intermediate network person Whilst I do understand that the digits are referred to as an octet in an ip address, I was not aware that a particular decimal value was not allowed?? No, I was confused by the "octet" comment you included, and the time of night when I was posting.

Example: 2 )) then usage elif (( $# == 2 )) then REGEX='^[1-9][0-9][.]([0-9][.])[0-9]$' BEGIN=

Hey PT, Yes I am open to suggestion as I am a novice to intermediate network person Whilst I do understand that the digits are referred to as an octet in an ip address, I was not aware that a particular decimal value was not allowed?? No, I was confused by the "octet" comment you included, and the time of night when I was posting.

Example: 2 )) then usage elif (( $# == 2 )) then REGEX='^[1-9][0-9][.]([0-9][.])[0-9]$' BEGIN=$1 END=$2 if !

$ == $ then SUBNET=$ START=$ STOP=$ else echo "First three octets must match when entering range!!

if you have a list of ip to validate , you can use this little bash script , this will open your IP list , then test if all the 4 numbers that make a standard beeten 0 and 255 if the ip is valid then the script will return valid , else it will return : not valid for IP_ADDRESS in `cat ip-list.txt` ; do #this var is a test that will see if the number is beetween 1 and 254 test='([1-9]?

Welcome to Linux Questions.org, a friendly and active Linux Community. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration.

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Hey PT, Yes I am open to suggestion as I am a novice to intermediate network person Whilst I do understand that the digits are referred to as an octet in an ip address, I was not aware that a particular decimal value was not allowed?? No, I was confused by the "octet" comment you included, and the time of night when I was posting.Example: 2 )) then usage elif (( $# == 2 )) then REGEX='^[1-9][0-9][.]([0-9][.])[0-9]$' BEGIN=$1 END=$2 if ! $BEGIN =~ $REGEX && $END =~ $REGEX then usage elif $ == $ then SUBNET=$ START=$ STOP=$ else echo "First three octets must match when entering range!!if you have a list of ip to validate , you can use this little bash script , this will open your IP list , then test if all the 4 numbers that make a standard beeten 0 and 255 if the ip is valid then the script will return valid , else it will return : not valid for IP_ADDRESS in `cat ip-list.txt` ; do #this var is a test that will see if the number is beetween 1 and 254 test='([1-9]?Welcome to Linux Questions.org, a friendly and active Linux Community. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration.If there is no IP-adress filled in, then the script must ping the subnet where the system is logged on.So if my ip is 192.168.1.6, then the script must ping from 192.168.1.1 till 192.168.1.255 Or else, if there is given a beginning and ending ip it must ping that!On my home network the first 3 'octets' are 192.168.1, as the first one has a 9 in it does this not disprove that the limit to individual digits is an 8? The second part of my comment, that the numbers in the four "positions" of the address are in the range [0-256) as a decimal number (or [\x00=\x100) as a hexadecimal number) is correct.So the check could be sharpened to check that the value in in the correct range.The first thing I always do when I’m working with a new data format is writing a script / function that can be used to validate it. With IPv4 this pretty boring and can be done with a one line regular expression (regex) that’s all over the web.I clean things up a bit by using shell variables but the regex should be clear: Nothing earth shattering. To compensate for the larger addresses size when representing IPv6 addresses in text, the RFC recommends a canonical textual representation with rules that allow for compression (called “zero folding”).

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