Uly.me

cloud engineer

convert

Bash Reformat Numbers

How to reformat numbers in Bash.

$ n=1023555
$ m=$(numfmt --to=si n)
$ echo $m
1.1M

Other options

--to=none     # no scaling. Output: 1023555
--to=si       # International System of Units (SI) standard. Output 1.1M
--to=iec      # International Electrotechnical Commission (IEC) standard. Output: 1.1Mi 
--to=iec-i    # International Electrotechnical Commission (IEC) standard. Output: 1.1M
--to=auto     # ‘auto’ can only be used with --from.

fmtnum

AWS display Lightsail snapshots

How to display Lightsail snapshots.

#!/bin/bash
displaysnapshots () {
  echo '--------------------------------------------------------'
  aws lightsail get-instance-snapshots --query 'instanceSnapshots[].[name]' --output text | sort
  echo '--------------------------------------------------------'
}
displaysnapshots

Result.

daily_ulyme_1637812801
daily_ulyme_1637899201
daily_ulyme_1637985601
daily_ulyme_1638072001

Adding timestamp to the output.

  aws lightsail get-instance-snapshots --query 'instanceSnapshots[].[name,createdAt]' --output text | sort

Result.

daily_ulyme_1637812801	1637812806.853
daily_ulyme_1637899201	1637899208.285
daily_ulyme_1637985601	1637985606.184
daily_ulyme_1638072001	1638072006.579

Convert Unix timestamp to iso8601. Edit your ~/.aws/config file. Add this line.

cli_timestamp_format = iso8601

Result.

daily_ulyme_1637812801	2021-11-25T04:00:06.853000+00:00
daily_ulyme_1637899201	2021-11-26T04:00:08.285000+00:00
daily_ulyme_1637985601	2021-11-27T04:00:06.184000+00:00
daily_ulyme_1638072001	2021-11-28T04:00:06.579000+00:00

Convert PPK to PEM

Convert PPK to PEM format.

  1. Open Puttygen.
  2. Click Load in the Actions section.
  3. Select the PPK file you wish to convert.
  4. Go to the Conversions menu and select Export OpenSSH key.
  5. Click Yes to convert key without a password.
  6. Name your private key and save it with a .pem extension.
  7. Click Save.

Your pem file should begin with “—–BEGIN RSA PRIVATE KEY—–” and ends with “—–END RSA PRIVATE KEY—–.”

You can also use puttygen in Linux. Install it first.

$ sudo apt-get install putty-tools

Convert your key.

$ puttygen yourkey.ppk -O private-openssh -o yourkey.pem

SSH to your server.

$ chmod 400 yourkey.pem
$ ssh -i yourkey.pem ec2-user@server-ip

Dos2unix

In Windows a new line, is a CR (carriage return) followed by LF (line feed). In Linux, it’s just LF. If you bring over a text file from Windows to Linux, sometimes you’ll end up with a file with a bunch of ^M at the end of each line, which will breaks a lot of things. To fix, just run dos2unix. 

dos2unix file.txt

FFMPEG Convert MP3 to OGG

How to convert MP3 to OGG audio format.

ffmpeg -i in.mp3 -ar 48000 -vn -c:a libvorbis out.ogg

If you have sample rate errors, use -vn.