Many temp files generated when running ksh scripts

Issue

• When a ksh script is running, many 0-byte files may be generated/deleted in /tmp folder. For example:
  /tmp/sf3f.47k
  /tmp/sf30.2sc
  /tmp/sf3b.t1b
  /tmp/sf0c.8d0

• Although these temp files do not last long, if there's an antivirus service running, when it scans these temp files, it could cause high loading or server hang.