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shell scripting

intro

  • intro

    file.sh // file extention for shel files.
$foo = "bar"  // define foo
echo $foo // print foo value
echo "something $foo" // $foo is a variable, this won't work with single quote.
echo "something $(<cmnd>)" // cmnd will be executed, and its value will be addeed to the string.
$# // number of arguments
$0 // comand name
$1 - $9 // first - 9th argument
$$  // Process identification number (PID) for the current script
-ne // not equal
convert image.{png,jpg} // convert image.png or image.jpg

comments

  • .cmd files:

        @echo off
    rem your comment here
    rem another comment line

  • .sh files:

        # your comment here
    # another comment line

Execute

  • run .sh files in cmd or powershell:

        Bash <file.sh> <args>
    sh <file.sh> <args>

handy shell scripts

  • create private github repo from the terminal:

        create=curl -H "Authorization: token <token>" -H "Contnet-Type: application/json" https://api.github.com/user/repos -d "{ \"name\": \"$1\", \"private\": true }"

  • create private github repo and add it to the existing project: 

        create-add=curl -H "Authorization: token <token>" -H "Contnet-Type: application/json" https://api.github.com/user/repos -d "{ \"name\": \"$1\", \"private\": true }" && git remote add origin https://github.com/<your github user name>/$1.git

  • create folder and cd into it:

        mcd=mkdir $1 && cd $1

references: