Workflow Node Steps that perform various functions on files for unixy Nodes.

Steps:

• *nixy / file / contains – file contains pattern
• *nixy / file / dos2unix – process file with dos2unix
• *nixy / file / exists – assert file exists. Exit 1, if not.
• *nixy / file / not-exists – assert file does not exist. Exit 1, if so.
• *nixy / file / rotate – rotate the file and optionally gzip it.
• *nixy / file / truncate – truncate the file