Bash multiple variable assignment

Question

Objective

Assign HTTP status code and date from cURL output to RESP and DATE variables using one-liner command.

Expectation

[08 Nov 2017 19:28:44 GMT] 301

Reality

$ read -d "\n" RESP DATE <<< $(curl -sv https://google.com 2>&1 | egrep -i "< HTTP/2|< Date" | sed "s/< HTTP\/2 //;s/< date: //g"); echo "[$DATE] $RESP"
[
] 30108 Nov 2017 19:28:44 GMT
$

EDIT:

Here's the full working command:

$ read -d "\r" RESP DATE <<< $(curl -sv https://google.com 2>&1 | tr -d "\r" | egrep -i "< HTTP/2|< Date" | sed "s/< HTTP\/2 //;s/< date: //g"); echo "[$DATE] $RESP"
[Wed, 08 Nov 2017 19:57:33 GMT] 301
$

janos · Accepted Answer · 2017-11-08 19:55:25Z

2

The output of curl contains some \r characters, that's why the output looks messed up. You can get rid of it by inserting a tr -d '\r' into the pipeline after the curl and before the egrep.

Is it really important to read into RESP and DATE variables? You could use Awk to extract the interesting parts simpler, saner, and output directly in the desired format:

curl ... | tr -d '\r' | awk '/^< Date: / { date = substr($0, 9); print "[" date "] " resp } /^< HTTP\// { resp = $3 }'

edited Nov 8, 2017 at 19:55

answered Nov 8, 2017 at 19:50

janos

126k31 gold badges242 silver badges253 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

devxvda1 Over a year ago

Thank you! It works now! I edited my post with full working command. Cheers!

glenn jackman · Accepted Answer · 2017-11-08 20:10:17Z

2

How about awk:

curl --silent --head https://google.com | awk '
    /^HTTP/ {code = $2} 
    /^Date:/ {
        sub(/\r$/,"")
        date = substr($0,7)
        printf "[%s] %s\n", date, code
        exit
    }
'

Using an HTTP HEAD request to minimize traffic.

answered Nov 8, 2017 at 20:10

glenn jackman

249k42 gold badges233 silver badges362 bronze badges

Collectives™ on Stack Overflow

Bash multiple variable assignment

Objective

Expectation

Reality

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

Objective

Expectation

Reality

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related