getline

The *getline* command can obtain input from any number of files and does not require a command line parameter to be provided for the [filename]. The following summarises six variants of getline applications, listing which variables are set by each one:

_Failure_

If a [failure] occurs during the [getline] operation, the special variable [ERRNO] should becomes set and the [awk] script should [abort] with a [fatal] error. However, some versions of [awk] do not [abort] following the [failure] of [getline].

_There is no corresponding putline_

The getline function does not have a corresponding '''putline''' function. In awk, output to a specific file is achieved by using [redirection].