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Question: Is there an easy way how I can teach zsh to check the command line before executing it? I know that I can completely wrap a specific program with an extra script, but this is not what I want to do.

Example: Using tab completion, it could happen to me easily, that I overwrite my input file by calling gcc wrongly e.g.

gcc test.c -o test.c

instead of

gcc test.c -o test
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up vote 3 down vote accepted

You could redefine the accept-line zle widget to do all the checks you want like:

accept-line() {
  if [[ $BUFFER =~ '^gcc.*-o\s*\S*\.c\b' ]]; then
    zle -M 'I will not do that!'
  else
    zle .$WIDGET "$@"
  fi
}
zle -N accept-line
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