Add more new lines to end of line in stdout

Question

I want to be able to print out my logs with extra new lines.

This is what the logs look like

2021/04/29 12:30:19 [error] 30098#30098: *443497 FastCGI sent in stderr: "PHP message: PHP Warning: Use of undefined constant last_login - assumed 'last_login' (this will throw an Error in a future version of PHP) in /var/www/html/app/addons/my_changes/func.php on line 9PHP message: PHP Notice: Array to string conversion in /var/www/html/app/addons/my_changes/func.php on line 9" while reading response header from upstream, client: 172.70.34.13, server: www.example.com, request: "GET /Total-9-Abrasive-Grinding-Disc-TAC2232301 HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php7.3-fpm.sock:", host: "www.example.com" 2021/04/29 12:30:24 [error] 30098#30098: *443501 FastCGI sent in stderr: "PHP message: PHP Warning: Use of undefined constant last_login - assumed 'last_login' (this will throw an Error in a future version of PHP) in /var/www/html/app/addons/my_changes/func.php on line 9PHP message: PHP Notice: Array to string conversion in /var/www/html/app/addons/my_changes/func.php on line 9" while reading response header from upstream, client: 172.70.34.73, server: www.example.com, request: "GET /Kitchen-and-Dinning/Tableware/Glass/Luminarc-Tumbler-6pcs-Scotland-33cl-N0763?sort=rating&order=DESC&limit=100 HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php7.3-fpm.sock:", host: "www.example.com" 2021/04/29 12:30:25 [error] 30098#30098: *443503 FastCGI sent in stderr: "PHP message: PHP Warning: Use of undefined constant last_login - assumed 'last_login' (this will throw an Error in a future version of PHP) in /var/www/html/app/addons/my_changes/func.php on line 9PHP message: PHP Notice: Array to string conversion in /var/www/html/app/addons/my_changes/func.php on line 9" while reading response header from upstream, client: 141.101.105.129, server: www.example.com, request: "GET /index.php?dispatch=product_features.add_product&product_id=9534&redirect_url=index.php%3Ffeatures_hash=1-877%26sort_by=popularity%26sort_order=desc%26layout=short_list%26dispatch=categories.view%26category_id=30%26page=15 HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php7.3-fpm.sock:", host: "www.example.com"

They look much cluttered in the terminal and although there is a newline, I want to add 1 more newline to make it more readable.

I tried using

tail -n 10 /var/log/nginx/example.com_error.log | sed 's/\n/\n\n/g'

and

tail -n 10 /var/log/nginx/example.com_error.log | tr '\n' '\n\n'

to no avail.

Paul Hodges · Accepted Answer · 2021-04-29 13:37:06Z

2

$ means end-of-line in sed.

$: cat file 12312312 123123123 123123123 123123123 $: sed 's/$/\n/' file 12312312 123123123 123123123 123123123

answered Apr 29, 2021 at 13:37

Paul Hodges

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3 Comments

Niloct Over a year ago

Doesn't work on Mac OS Catalina. Outputs each line like 12312312n with a single linebreak after.

Paul Hodges Over a year ago

$: awk '{print $0"\n"}' file probably doing similar?

Paul Hodges Over a year ago

You could try weirdness like this: $: tr "\012" @<file|sed 's/@/@@/g'|tr @ "\012"

William Pursell · Accepted Answer · 2021-04-29 14:06:14Z

$ printf 'foo\nbar\n' | pr -td foo bar $

Not entirely certain about portability, but the open group specs (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pr.html#tag_20_93_01) state:

-d Produce output that is double-spaced; append an extra <newline> following every <newline> found in the input.

and

-t Write neither the five-line identifying header nor the five-line trailer usually supplied for each page. Quit writing after the last line of each file without spacing to the end of the page

so it's pretty standard.

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