is.sh

Fancy alternative for old good test command

is.sh allows you to write conditions which can be read by average human being.

var=123

if is equal $var 123.0; then
    echo "it just works"
fi

if is not a substring $var "foobar"; then
    echo "and it's easy to read"
fi

is equal <valueA> <valueB> - checks if values are the same or if they are equal numbers
is matching <value> <regexp> - checks if whole value matches to regular expression
is substring <value> <string> - checks if first value is a part of second one
is empty <value> - checks if value is empty
is number <value> - checks if value is a number
is gt <numberA> <numberB> - true if first number is greater than second one
is lt <numberA> <numberB> - true if first number is less than second one
is ge <numberA> <numberB> - true if first number is greater than or equal to second one
is le <numberA> <numberB> - true if first number is less than or equal to second one
is file <path> - checks if it is a file
is dir <path> - checks if it is a directory
is link <path> - checks if it is a symbolic link
is existent <path> - checks if there is a file or directory or anything else with this path
is readable <path> - checks if file is readable
is writeable <path> - checks if file is writeable
is executable <path> - checks if file is executable
is older <pathA> <pathB> - checks if first file is older than second one
is newer <pathA> <pathB> - checks if first file is newer than second one
is true <value> - true if value is equal “true” or “0”
is false <value> - oposite of is true <value>

You can negate any condition by putting not in front of it:

$ is a number "abc" && echo "number"
$ is not a number "abc" && echo "not a number"
not a number