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  • This works. But, Is this increase my hard-disk usage? Commented Jan 3, 2018 at 1:37
  • @alhelal, that depends on the file sizes and your memory utilization. Obviously since you're not deleting file1 your hard disk usage will have a net increase (although even that's not actually true in all cases). But will you have a temporary increase in hard disk utilization? That's a different layer of abstraction, not answerable from the data given. Commented Jan 3, 2018 at 1:55
  • Does this create temporary file? Commented Jan 3, 2018 at 1:59
  • @alhelal, again, that depends on the file size and your memory utilization. Commented Jan 3, 2018 at 2:01
  • 2
    In modern systems ex is usually implemented as part of vim. vim creates a swap file. I'm not sure if ex does same but if you add -n to a ex/vim invocation that will prevent swap file creation. So you might want to do that depending on what your requirements are. Commented Jan 3, 2018 at 2:22