is.sh

Fancy alternative for old good test command

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

Usage

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

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:

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

Published: April 14 2015

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