Re: bug in AWK

[Neil R. Ormos]

Evgeny Smirnov wrote:

> It seems I've found a bug in awk.
============================================================
> script.awk:
> BEGIN{
> OFS=","
> }
> {
> "date -d \""$0"\" +%H" | getline d
> print $0, d
> }
============================================================
> data.txt:
> 2016-09-04 20:14:29
> 2016-09-04 19:14:29
> 2016-09-04 20:14:29
============================================================

You forgot to call close() after the pipe to getline.

E.g.,

  close("date -d \""$0"\" +%c");

See the manual:

| If the same file name or the same shell command
| is used with getline more than once during the
| execution of an awk program (see section
| Explicit Input with getline), the file is opened
| (or the command is executed) the first time
| only.

  <https://www.gnu.org/software/gawk/manual/gawk.html#Close-Files-And-Pipes>