Impair Command History Logging / Timestomp / Masquerading

A Linux evasion collection with independent examples for suppressing Bash session history, changing file access and modification timestamps, and limiting unprivileged users' visibility into other users' /proc process directories. These examples are not a required sequence. They do not erase earlier history, make touch change ctime or birth time, or hide other users' process entries from root or appropriately privileged users.