Trello – backup to your linux machine

Just in case, you are looking for backing up your trello account boards, you can use the following bash script to do so:

#!/bin/bash -
#===============================================================================
#
#          FILE: backup-trello.sh
#
#         USAGE: ./backup-trello.sh
#
#   DESCRIPTION:
#
#       OPTIONS: ---
#  REQUIREMENTS: ---
#          BUGS: ---
#         NOTES: ---
#        AUTHOR: Amit Agarwal (aka)
#  ORGANIZATION: Mobileum
# Last modified: Thu Dec 22, 2016  01:14PM
#       CREATED: 08/12/2016 09:41:08 AM IST
#      REVISION: $Revision: 1.0 $$
#===============================================================================

# Your backup directory
BDIR=/backup

# Your trello api token and key goes here :)
token=<>
key=<>


# IDs of the boards go here. This is easy to get, just go to your 
# board and check the last part of URL
BOARDS=( a b )


URL="https://trello.com/b/"
POST='&actions=all&actions_limit=1000&cards=all&lists=all&members=all&member_fields=all&checklists=all&fields=all'

for i in ${BOARDS[*]}
do
    /usr/bin/curl -H 'Accept-Encoding:gzip, deflate, br' -H 'Accept:text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8' "$URL$i.json?&key=$key&token=$token$POST" > "$BDIR/$i.json.gz"
    # gzip -f "$BDIR/$i.json"
done

change the output format for time command

If you are doing some scripting and using ‘time’ command, then you know sometimes it becomes difficult to capture the output as the output would be something like this:

: amit ; time ls

real    0m0.002s
user    0m0.000s
sys 0m0.001s

So, it is better to change that format. Here is simple example:

  <td>
    <div class="text codecolorer">
      &nbsp;
    </div>
  </td>
</tr>

TIMEFORMAT=’real %3R user %3U sys %3S pcpu %P’ time ls

amit ;  TIMEFORMAT=’real %3R user %3U sys %3S pcpu %P’ time ls

0.00user 0.00system 0:00.00elapsed 0%CPU (0text+0data 2432max)

0inputs+0outputs (0major+109minor)pagefaults 0swaps

amit ; TIMEFORMAT=’real %3R user %3U sys %3S’

amit ; time ls
real 0.001 user 0.001 sys 0.000

amit ;

amit ; TIMEFORMAT=’TIMEOUTPUT = real %3R user %3U sys %3S’

amit ; time ls
TIMEOUTPUT = real 0.001 user 0.001 sys 0.000

amit ;

Generate random string for various use case

Some times I need random string, for example to use as email seperator or to use in some API. One way is to use tools like /dev/[u]random or od and other such. But they seem cubersome after I figured this out.

openssl rand <length>
openssl rand 10

This alone without some parameters is not interesting thoug. You can use ‘-base64’ or ‘-hex’ to select the encoding.

So if you execute the above you will get something like this

Get your local IP address like pro

In shell scripts if you need to get you local IP address corresponding to your hostname then you can use this command

hostname -i

Related articles across the web

• DNS as the Security Cornerstone
• Making Your iOS Apps IPv6 Ready
• Why Name.co.zw’s Instant Nameserver Updates Feature is a Huge Deal…

image ordering by Original Date Time using bash script

Here is the script:

#!/bin/bash -
#===============================================================================
#
#          FILE: imgOrg.sh
#
#         USAGE: ./imgOrg.sh
#
#   DESCRIPTION:
#
#       OPTIONS: ---
#  REQUIREMENTS: ---
#          BUGS: ---
#         NOTES: ---
#        AUTHOR: Amit Agarwal (aka)
#      REVISION:  ---
#===============================================================================

for i in *
do
    if [[ $(file $i) == *image* ]] 
    then
        echo "Image file is :: $i"
        dir=$( exiftool -s -DateTimeOriginal $i | awk -F':' '{print $2"/"$3}')
        mkdir -p $dir
        cp $i $dir/
    else
        echo "Excluding $i"
    fi
done

How to verify sha256sum for multiple file or one file.

So, lets say you have downloaded the SHA256SUMS files. This file contains the sha256sum for multiple files and you want to compare the values for only one or some of them, then the simplest thing you can do is:

sha256sum -c SHA256SUMS

Now, with this if you do not have some files present then you might get some errors and if you do not want that, then you can try this:

Get count of lines in scripts (shell)

If you have tried to get the count of lines in file, the you would know about “nl” or “wc -l”. But as you are aware these give you number of lines with other details as well and you need to post process the number to make sure that you have only number and nothing else. In such cases, it is useful to use the count feature of grep and here is a shorthand to get the count of lines in any shell script: