/proc
- is a virtual file system ( files are not stored on disk ) which gives system information
- gives detailed information about kernel , hardware and running processes
- normally used to display process info , memory resources , hardware devices , kernel memory etc
- can be used to get or set kernel configuration
- can be used to modify kernel features
- modifications apply immediately
- Entries are not persisitant : modifications get reinitialized after a reboot
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