Environment Script leaves files in /tmp on Ubuntu
Each time we run a new build, a new file is created under /tmp, e.g.

rw-rr- 1 jenkins jenkins 109 Dec 2 12:15 Foobar-Build809600488091589861.sh
rw-rr- 1 jenkins jenkins 109 Dec 11 09:34 Foobar-Build8142409455122904929.sh
rw-rr- 1 jenkins jenkins 109 Dec 18 10:52 Foobar-Build8155513293743564459.sh
rw-rr- 1 jenkins jenkins 109 Dec 23 08:25 Foobar-Build8164362789916553503.sh
rw-rr- 1 jenkins jenkins 109 Dec 19 07:03 Foobar-Build8165252111695871923.sh
rw-rr- 1 jenkins jenkins 109 Jan 13 11:57 Foobar-Build8178047038033455844.sh
rw-rr- 1 jenkins jenkins 109 Jan 15 06:16 Foobar-Build8189743526809125146.sh
rw-rr- 1 jenkins jenkins 109 Dec 8 07:59 Foobar-Build8197831626738247047.sh
rw-rr- 1 jenkins jenkins 109 Dec 3 16:06 Foobar-Build8202683899632609072.sh
rw-rr- 1 jenkins jenkins 109 Nov 6 13:55 Foobar-Build8228796130409512367.sh
rw-rr- 1 jenkins jenkins 109 Jan 15 13:22 Foobar-Build8240488157191986888.sh
rw-rr- 1 jenkins jenkins 109 Nov 19 13:08 Foobar-Build8262938238272938552.sh

These accumulate over time, and have to be manually deleted.
For example, we have 1350 of these files in /tmp since Nov 4-Jan 28.