[bug #19337] Whish: Include Option to view first line of file/stream

[Bob Proulx]

Follow-up Comment #4, bug #19337 (project grep):

> ps aux | head -1; ps aux | grep foo

Another way to provide this is to include a grep pattern that will match the
first line.  Example:

  ps aux | grep -e ^USER -e foo

> ps aux | (head -1; grep foo)
> but that didn't work consistently for me across all systems I
> work on. I suspect it only works with the most recent versions
> of coreutils. (If someone knows why, please add to the
> discussion.)

That is almost certainly due to head using libc's stdio library which on
different systems is buffering input.  After head has read it the data is no
longer available for grep to read.


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