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Accepted
Angel Montes de Oca
Asked: 2020-09-28 13:23:23 +0800 CST 2020-09-28 13:23:23 +0800 CST

How to compare a variable with a string in Shell Script?

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I am trying to compare a variable with a String but I have not found a way to do it, the variable is the result of a function, which the result can be "Terminal" or "Server", which I can print without any problem, the The problem is that I can't find a way to compare it with a string, here is my code:

function seleccionar(){
osascript <<EOT
set rTipo to the button returned of (display dialog "$1" buttons {"Terminal", "Servidor"} default button "Servidor")
if(rTipo = "Terminal")then
return rTipo
do shell script "echo 'type=terminal'> ~/Desktop/type.txt"
end if
if(rTipo = "Servidor")then
return rTipo
do shell script "echo 'type=servidor'> ~/Desktop/type.txt"
end if
EOT
}

value="$(seleccionar 'Selecciona el tipo de instalacion:')"
echo $value

I'm looking to compare it like this:

if value == "Servidor ; then
  if lsof -Pi :3306 -sTCP:LISTEN -t >/dev/null ; then #comprueba el puerto 3306
  echo "El puerto 3306 ya se encuentra en uso"
  exit 1
  fi
fi

is there any way?

shell

2 Answers

  1. To supplement your own answer to your question.

    In addition to [[ you can use test or [ For example, to compare a string, as you did with [[ "$value" = "Terminal" ]]you could do it the same way with:

    $ [ "$value" = "Terminal" ] && echo "es igual" || echo "es diferente"
$ # o con test
$ test "$value" = "Terminal" && echo "es igual" || echo "es diferente"

    testand [are synonymous with bash's own commands. Instead [[it is an updated version of [ , however it is not portable.

    For more information about those commands, you can refer to the following links.

    • 1
  2. Best Answer

    I found the way to do it, here an example:

    if [[ $value = "Terminal" ]];
then
echo "Seleccionaste Terminal"
elif [[ $value = "Servidor" ]];
then
echo "Seleccionaste Servidor"
fi
    • 0