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Timeline for Difference between $0 and $SHELL?

Current License: CC BY-SA 4.0

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Sep 16, 2021 at 20:33 comment added Kusalananda @teja_M19 Good! If this solves your issue, please consider accepting the answer. Accepting an answer marks the issue as resolved.
Sep 16, 2021 at 20:26 comment added teja_M19 Thanks dude for your help and time
Sep 16, 2021 at 20:12 comment added FelixJN @ilkkachu answer adapted.
Sep 16, 2021 at 20:12 history edited FelixJN CC BY-SA 4.0
added 218 characters in body
Sep 16, 2021 at 19:46 comment added ilkkachu in particular, in Bash SHELL "expands to the full pathname to the shell. If it is not set when the shell starts, Bash assigns to it the full pathname of the current user’s login shell." -- gnu.org/software/bash/manual/bash.html#Shell-Variables (so it might not be actually related in any way, e.g. (unset SHELL; bash -c 'echo $SHELL') might well print /usr/bin/zsh...)
Sep 16, 2021 at 19:43 history answered FelixJN CC BY-SA 4.0