24 апр. 2015 г. · How to determine a Python variable's type? 2 · How do I tell what type of data is inside python variable? 5 · How to check type of variable?

30 авг. 2010 г. · It's best to check it according to the type of variable: env variable, parameter or regular variable. For a env variable: [[ $(env | grep ...

25 янв. 2013 г. · According to this wiki page, you can use this command: declare -p variable-name 2> /dev/null | grep -q '^declare \-a'

30 апр. 2009 г. · One approach is to use a regular expression, like so: re='^[0-9]+$' if ! [[ $yournumber =~ $re ]] ; then echo "error: Not a number" >&2; exit 1 fi

27 мая 2017 г. · The "right" way to check if a variable is set in bash looks like this: if [ -z ${var+x} ]; then echo "var is unset" else echo "var is set to '$var'" fi

24 окт. 2022 г. · There are no variable types. All variables are strings (type).. Variables store a value (a string), but also variables have some additional magic attributes ...

14 мар. 2016 г. · I need to be able to check if a variety of similar variables are set in bash. I need to check if the string defined in the variable CONFIG_STRING_TO_CHECK has ...

26 окт. 2012 г. · A safer way to check is to enclose both sides in double quotes, ie if [ "$depth" -eq "0" ] ; this way, an unset variable ( $depth ) evaluates to "".

1 июн. 2010 г. · I tried to declare a Boolean variable in a shell script using the following syntax: variable=$false variable=$true Is this correct?

9 нояб. 2011 г. · I am trying to write a script in bash that check the validity of a user input. I want to match the input (say variable x ) to a list of valid values.