🔒 Closed Simple Bash Scripting #2

[PHC-TheGlock]

OK, Lets Start... Iksian ko nalang baka i tl;dr nyo eh.
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Get all URL from String/File using Grep:​

---

foo.html

<a href="https://example.com/foo?bar=foo">...</a>

cat foo.html | grep -o "https://[^'\"<>]*"

Output:

https://example.com/foo?bar=foo

Get all IP's from String/File using Grep:​

---

ips.txt

lol 1.1.1.1
2.2.2.2 lol
i am ip 1.2.3.4

cat ips.txt | grep -E -o "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)"

Output:

1.1.1.1
2.2.2.2
1.2.3.4

Get domain from URL String using AWK:​

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echo "https://example.com/foo?bar=foo" | awk -F[/:] '{print $4}'

Output:

example.com

Get the IP of your Machine/VPS:​

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Method 1: From IFCONFIG (Sometimes You Get your Private IP Here)

ifconfig | grep inet | awk 'NR==1 {print $2}'

Method 2: Using DIG (DNS Record)

dig @resolver4.opendns.com myip.opendns.com +short

IPv6: (If No Output, IPv6 is not Applicable)

dig @resolver1.ipv6-sandbox.opendns.com AAAA myip.opendns.com +short -6'

Output:

xxx.xxx.xxx.xxx (which is your ip)

 

[dark_cloud]

sa ip matching boss, kapag may katabing string, hindi considered na ip yung halimbawa, 2.3.4.5blahblah. o kapag mahigit sa 255. eto yung resulta kapag ni-run sa current script:

$ cat ip.txt
lol 1.1.1.1
2.2.2.2 lol
i am ip 1.2.3.4
lol1.1.1.1
2.2.2.2lol
i am ip1.2.3.4
333.2.3.4
256.2.3.4

$ while read; do echo "$(grep -E -o '(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)' <(echo ${REPLY})) -- original line: ${REPLY}"; done < ip.txt
1.1.1.1 -- original line: lol 1.1.1.1
2.2.2.2 -- original line: 2.2.2.2 lol
1.2.3.4 -- original line: i am ip 1.2.3.4
1.1.1.1 -- original line: lol1.1.1.1
2.2.2.2 -- original line: 2.2.2.2lol
1.2.3.4 -- original line: i am ip1.2.3.4
33.2.3.4 -- original line: 333.2.3.4
56.2.3.4 -- original line: 256.2.3.4

pwede pa ma-improve, tulad nito:

$ while read; do echo "$(grep -oE '\<(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\>' <(echo ${REPLY})) -- original line: ${REPLY}"; done < ip.txt
1.1.1.1 -- original line: lol 1.1.1.1
2.2.2.2 -- original line: 2.2.2.2 lol
1.2.3.4 -- original line: i am ip 1.2.3.4
 -- original line: lol1.1.1.1
 -- original line: 2.2.2.2lol
 -- original line: i am ip1.2.3.4
 -- original line: 333.2.3.4
 -- original line: 256.2.3.4

hindi selected yung last 5 kase hindi valid ip.

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yung get domain from url, eto siguro bossing mas magaan sa bulsa kesa sa awk.

$ echo "https://example.com/foo?bar=foo" | grep -o '.\+/'
https://example.com/

----
mas concise na ip grabber

$ ip -o -4 addr ls | grep -o '\<inet [^ ]\+\>'
inet 127.0.0.1/8
inet 192.168.20.10/24