Split string into multiple variables in Bash

Question

I have a string that gets generated below:

192.168.1.1,UPDOWN,Line protocol on Interface GigabitEthernet1/0/13, changed state to up

How can I take that string and make 2 variables out of it (using bash)?

For example I want

$ip=192.168.1.1 
$int=GigabitEthernet1/0/13

How is `GigabitEthernet1/0/13` delimited? Whatever follows `Interface`? — Michael Berkowski, May 14 '14 at 20:00

score 51 · Accepted Answer · answered May 15 '14 at 07:48

Try this:

mystring="192.168.1.1,UPDOWN,Line protocol on Interface GigabitEthernet1/0/13, changed state to up"

IFS=',' read -a myarray <<< "$mystring"

echo "IP: ${myarray[0]}"
echo "STATUS: ${myarray[3]}"

In this script ${myarray[0]} refers to the first field in the comma-separated string, ${myarray[1]} refers to the second field in the comma-separated string, etc.

score 27 · Answer 2 · answered May 14 '14 at 20:04

27

Use read with a custom field separator (IFS=,):

$ IFS=, read ip state int change <<< "192.168.1.1,UPDOWN,Line protocol on Interface GigabitEthernet1013, changed state to up"
$ echo $ip
192.168.1.1
$ echo ${int##*Interface}
GigabitEthernet1013

Make sure to enclose the string in quotes.

answered May 14 '14 at 20:04

damienfrancois

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how do I split a string into one array variable? – Inoperable Apr 14 '17 at 05:35
1

@Inoperable http://stackoverflow.com/questions/10586153/split-string-into-an-array-in-bash – damienfrancois Apr 14 '17 at 06:14

score 8 · Answer 3 · answered May 14 '14 at 20:13

8

@damienfrancois has the best answer. You can also use bash regex matching:

if [[ $string =~ ([^,]+).*"Interface "([^,]+) ]]; then 
    ip=${BASH_REMATCH[1]}
    int=${BASH_REMATCH[2]}
fi
echo $ip; echo $int

192.168.1.1
GigabitEthernet1/0/13

With bash regexes, any literal text can be quoted (must be, if there's whitespace), but the regex metachars must not be quoted.

answered May 14 '14 at 20:13

glenn jackman

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4

I'll point out here what I said in my now-deleted redundant answer: a regular expression may not be that much better than string splitting in this case, but can be useful for other problems. – chepner May 14 '14 at 20:15

Split string into multiple variables in Bash

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