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The clever reload-from-disk trick that let DOS's COMMAND.COM recover automatically after a large program overwrote its expendable transient portion.
Use Haiku Terminal, Bash profiles and native filesystem tools safely, write portable scripts, and separate POSIX habits from Linux assumptions.
An operational account of Catalina's zsh default: which accounts changed, what stayed on Bash, and how administrators could migrate without breaking scripts.
Terminal and shell are separate programs linked by a kernel pty: one renders characters and handles input, the other interprets commands.