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136 lines
3.5 KiB
Text
136 lines
3.5 KiB
Text
---
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title: About the command Resource
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---
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# command
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Use the `command` InSpec audit resource to test an arbitrary command that is run on the system.
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<br>
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## Syntax
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A `command` resource block declares a command to be run, one (or more) expected outputs, and the location to which that output is sent:
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describe command('command') do
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it { should exist }
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its('property') { should eq 'output' }
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end
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where
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* `'command'` must specify a command to be run
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* `'matcher'` is one of `exit_status`, `stderr`, or `stdout`
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* `'output'` tests the output of the command run on the system versus the output value stated in the test
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<br>
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## Examples
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The following examples show how to use this InSpec audit resource.
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### Test for PostgreSQL database running a RC, development, or beta release
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describe command('psql -V') do
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its('stdout') { should eq '/RC/' }
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its('stdout') { should_not eq '/DEVEL/' }
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its('stdout') { should_not eq '/BETA/' }
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end
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### Test standard output (stdout)
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describe command('echo hello') do
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its('stdout') { should eq "hello\n" }
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its('stderr') { should eq '' }
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its('exit_status') { should eq 0 }
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end
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### Test standard error (stderr)
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describe command('>&2 echo error') do
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its('stdout') { should eq '' }
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its('stderr') { should eq "error\n" }
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its('exit_status') { should eq 0 }
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end
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### Test an exit status code
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describe command('exit 123') do
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its('stdout') { should eq '' }
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its('stderr') { should eq '' }
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its('exit_status') { should eq 123 }
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end
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### Test if the command shell exists
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describe command('/bin/sh').exist? do
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it { should eq true }
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end
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### Test for a command that should not exist
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describe command('this is not existing').exist? do
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it { should eq false }
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end
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### Verify NTP
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The following example shows how to use the `file` audit resource to verify if the `ntp.conf` and `leap-seconds` files are present, and then the `command` resource to verify if NTP is installed and running:
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describe file('/etc/ntp.conf') do
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it { should be_file }
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end
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describe file('/etc/ntp.leapseconds') do
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it { should be_file }
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end
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describe command('pgrep ntp') do
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its('exit_status') { should eq 0 }
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end
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### Verify WiX
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Wix includes serveral tools -- such as `candle` (preprocesses and compiles source files into object files), `light` (links and binds object files to an installer database), and `heat` (harvests files from various input formats). The following example uses a whitespace array and the `file` audit resource to verify if these three tools are present:
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%w(
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candle.exe
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heat.exe
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light.exe
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).each do |utility|
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describe file("C:/wix/##{utility}") do
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it { should be_file }
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end
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end
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<br>
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## Matchers
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For a full list of available matchers please visit our [matchers page](https://www.inspec.io/docs/reference/matchers/).
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### exist
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The `exist` matcher tests if a command may be run on the system:
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it { should exist }
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### exit_status
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The `exit_status` matcher tests the exit status for the command:
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its('exit_status') { should eq 123 }
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### stderr
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The `stderr` matcher tests results of the command as returned in standard error (stderr):
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its('stderr') { should eq 'error' }
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### stdout
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The `stdout` matcher tests results of the command as returned in standard output (stdout). The following example shows matching output using a regular expression:
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describe command('echo 1') do
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its('stdout') { should match (/[0-9]/) }
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end
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