Description:
append-if-missing appends content to the end of a file after determining that the content does not already exist in the file.
It is useful for system administration tasks where one wishes to add a snippet of configuration to a file if it does not already exist. It is most useful for automated system administration, such as adding keys to a user's ssh authorized_keys file or any other file whose contents need to be unique.
Its functionality could be, and has been, duplicated by various shell incantations. This file was created after too many such incantations were uttered. As Whitehead stated, "Civilization advances by extending the number of important operations which we can perform without thinking about them."
Usage:
insert text in file
$ append-if-missing -t text file
read contents of source and insert in file
$ append-if-missing -f source file
The -t and and -f option can be more verbosely said as --text and --source
Author
Gyepi Sam self-github@gyepi.com