1. Not sure what you mean by memory not being released by the operating system. Memory is requested from the operating system and owned by the process until it is no longer running. Perhaps, you have a process that can be stopped and re-started.
2. If memory is filling up too quickly...
Questions for you: What is the real name of this file? Does ls -bl show a different name? I can delete ~! from within sh as well as ksh.
For troublesome files, I create a shell script from ls -b. In this case, knowing that the filename is only two characters long, ls -b ?? > rm.sh. I then...
You don't state why you want your user's files to be executable. If a user is creating executable files (scripts and programs) he/she should first learn the chmod command. unix never "assumes" that a file is executable.
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