Многострочные команды запутаны в моем PS1

man grep покажет вам флаг -w :

-w, --word-regexp Select only those lines containing matches that form whole words. The test is that the matching substring must either be at the beginning of the line, or preceded by a non-word constituent character. Similarly, it must be either at the end of the line or followed by a non-word constituent character. Word-constituent characters are letters, digits, and the underscore. 

Или придерживаться | egrep -v Jobname в начале вашего конвейера.