Merge pull request #15 from qzb/is.sh

Added package "is.sh"

Author: jwerle

_posts/2015-04-14-issh.md

@@ -0,0 +1,66 @@
+---
+layout: post
+title: "is.sh"
+description: "Fancy alternative for old good test command"
+category: bash
+tags: [utility, condition, bash]
+---
+
+**is.sh** allows you to write conditions which can be read by average human being.
+
+
+## Usage
+
+{% highlight bash %}
+var=123
+
+if is equal $var 123.0; then
+    echo "it just works"
+fi
+
+if is not a substring $var "foobar"; then
+    echo "and it's easy to read"
+fi
+{% endhighlight %}
+
+
+### Available conditions
+
+* ``is equal <valueA> <valueB>`` - checks if values are the same or if they are equal numbers
+* ``is matching <value> <regexp>`` - checks if whole value matches to regular expression
+* ``is substring <value> <string>`` - checks if first value is a part of second one
+* ``is empty <value>`` - checks if value is empty
+* ``is number <value>`` - checks if value is a number
+* ``is gt <numberA> <numberB>`` - true if first number is greater than second one
+* ``is lt <numberA> <numberB>`` - true if first number is less than second one
+* ``is ge <numberA> <numberB>`` - true if first number is greater than or equal to second one
+* ``is le <numberA> <numberB>`` - true if first number is less than or equal to second one
+* ``is file <path>`` - checks if it is a file
+* ``is dir <path>`` - checks if it is a directory
+* ``is link <path>`` - checks if it is a symbolic link
+* ``is existent <path>`` - checks if there is a file or directory or anything else with this path
+* ``is readable <path>`` - checks if file is readable
+* ``is writeable <path>`` - checks if file is writeable
+* ``is executable <path>`` - checks if file is executable
+* ``is older <pathA> <pathB>`` - checks if first file is older than second one
+* ``is newer <pathA> <pathB>`` - checks if first file is newer than second one
+* ``is true <value>`` - true if value is equal "true" or "0"
+* ``is false <value>`` - oposite of ``is true <value>``
+
+
+### Negations
+
+You can negate any condition by putting ``not`` in front of it:
+
+{% highlight bash %}
+$ is a number "abc" && echo "number"
+$ is not a number "abc" && echo "not a number"
+not a number
+{% endhighlight %}
+
+
+## Links
+
+* [Source Code (GitHub)](https://github.com/qzb/is.sh);
+* Author: [Józef Sokołowski](https://github.com/qzb);
+