shell – Kev's Development Toolbox

July 17, 2021July 17, 2021

aws cli : Listing Lambda functions and filtering with jq

‘aws lambda list-functions’ returns function details in your current region, but the info is sometimes too verbose when you’re looking for a list of names:

{
    "Functions": [
{
    "FunctionName": "example1",
    "FunctionArn": "arn:aws:lambda:us-west-2:111111111:function:example1",
    "Runtime": "java8",
    "Role": "arn:aws:iam::111111111:role/example-role",
    "Handler": "package.YourHandler::myHandler",
    "CodeSize": 3381385,
    "Description": "",
    "Timeout": 6,
    "MemorySize": 1024,
    "LastModified": "2021-01-13T08:18:33.727+0000",
    "CodeSha256": "aaabbbccc=",
    "Version": "$LATEST",
    "TracingConfig": {
      "Mode": "PassThrough"
    },
    "RevisionId": "aa-bb-cc-dd"
  },
  {
    "FunctionName": "example2",
    "FunctionArn": "arn:aws:lambda:us-west-2:111111111:function:example2",
    "Runtime": "java8",
    "Role": "arn:aws:iam::111111111:role/example-role",
    "Handler": "package.YourHandler2::myHandler",
    "CodeSize": 3381385,
    "Description": "",
    "Timeout": 6,
    "MemorySize": 1024,
    "LastModified": "2021-01-13T08:18:33.727+0000",
    "CodeSha256": "aaabbbccc=",
    "Version": "$LATEST",
    "TracingConfig": {
      "Mode": "PassThrough"
    },
    "RevisionId": "aa-bb-cc-dd"
  }
]
}

Passing this into JQ you can filter to display any of the properties easily with patterns like:

aws lambda list-functions | jq '.Functions[].FunctionName

November 19, 2018November 19, 2018

Displaying the current git branch in your MacOS terminal shell prompt

From : https://gist.github.com/ankurk91/2efe14650d54d7d09528cea3ed432f6d

#Git branch in prompt.
parse_git_branch() {
    git branch 2> /dev/null | sed -e '/^[^]/d' -e 's/ (.*)/ (\1)/'
}
export PS1="\u@\h \W[\033[32m]\$(parse_git_branch)[\033[00m] $ "

Want to find out more about these escaped codes and ANSI escape sequence color codes, here’s a good reference.

November 14, 2018November 14, 2018

Installing watch with brew on MacOS

watch is a useful utility to execute a command on a timed basis, and exists in many Linux shells.

To install on MacOS with brew:

brew install watch

To repeat a command:

watch -n 1 somecommand

… to repeat the command every 1 second

November 3, 2018November 3, 2018

Restoring your PATH on MacOS

The inevitable happened and while adding/removing some utils to my path, I messed up my .bash_profile and ended up with a PATH where I couldn’t run any commands.

To recover, the default PATH on MacOS should be:

export PATH="/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin"

From here.