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Question-1. What is Fish Shell?
Answer-1: Fish (Friendly Interactive Shell) is a modern shell focused on user-friendliness, auto-suggestions, and scripting simplicity.
Question-2. How is Fish different from Bash and Zsh?
Answer-2: Fish provides autosuggestions, syntax highlighting, and does not require explicit enabling of features.
Question-3. How do you check if Fish is installed?
Answer-3: Run fish --version in the terminal.
Question-4. How do you set Fish as the default shell?
Answer-4: Use chsh -s (which fish).
Question-5. Where is the Fish configuration file located?
Answer-5: It is located at ~/.config/fish/config.fish.
Question-6. How do you reload the Fish configuration?
Answer-6: Run source ~/.config/fish/config.fish.
Question-7. How do you install Fish on Linux?
Answer-7: Use sudo apt install fish (Debian/Ubuntu) or sudo dnf install fish (Fedora).
Question-8. How do you install Fish on macOS?
Answer-8: Use brew install fish.
Question-9. How do you switch to Fish temporarily?
Answer-9: Run fish in the terminal.
Question-10. How do you exit Fish shell?
Answer-10: Use exit or press Ctrl + D.
Question-11. What is unique about Fish?s auto-suggestions?
Answer-11: Fish provides real-time suggestions based on history and common commands.
Question-12. How do you create an alias in Fish?
Answer-12: Use alias name command, e.g., alias ll "ls -la".
Question-13. How do you remove an alias in Fish?
Answer-13: Restart Fish or remove the alias from config.fish.
Question-14. How do you make an alias permanent in Fish?
Answer-14: Add alias name command to ~/.config/fish/config.fish.
Question-15. What is abbr in Fish?
Answer-15: abbr defines short-lived command abbreviations that expand when typed.
Question-16. How do you create an abbreviation in Fish?
Answer-16: Use abbr -a name command, e.g., abbr -a gco "git checkout".
Question-17. How do you list all abbreviations in Fish?
Answer-17: Use abbr --show.
Question-18. How do you remove an abbreviation in Fish?
Answer-18: Use abbr --erase name.
Question-19. How do you define a function in Fish?
Answer-19: Use function name; commands; end, e.g., function myfunc; echo Hello; end.
Question-20. How do you list all functions in Fish?
Answer-20: Use functions.
Question-21. How do you delete a function in Fish?
Answer-21: Use functions -e function_name.
Question-22. How do you enable syntax highlighting in Fish?
Answer-22: It is enabled by default.
Question-23. How do you search command history interactively in Fish?
Answer-23: Use Ctrl + R.
Question-24. How do you disable autosuggestions in Fish?
Answer-24: Add set -g fish_autosuggestion_enabled 0 to config.fish.
Question-25. How do you check the exit status of the last command in Fish?
Answer-25: Use echo $status.
Question-26. How do you create a variable in Fish?
Answer-26: Use set varname value, e.g., set myvar 10.
Question-27. How do you display all variables in Fish?
Answer-27: Use set --show.
Question-28. How do you export an environment variable in Fish?
Answer-28: Use set -x varname value, e.g., set -x PATH /usr/local/bin:$PATH.
Question-29. How do you remove a variable in Fish?
Answer-29: Use set --erase varname.
Question-30. What is the fish_greeting variable?
Answer-30: It defines the message shown when Fish starts.
Question-31. How do you disable the Fish greeting?
Answer-31: Add set fish_greeting "" to config.fish.
Question-32. How do you create a Fish script?
Answer-32: Save commands in a .fish file and make it executable.
Question-33. How do you execute a Fish script?
Answer-33: Use fish script.fish.
Question-34. How do you enable universal variables in Fish?
Answer-34: Use set -U varname value.
Question-35. What is the fish_prompt function?
Answer-35: It customizes the Fish shell prompt.
Question-36. How do you edit the Fish prompt?
Answer-36: Redefine function fish_prompt in config.fish.
Question-37. How do you list background jobs in Fish?
Answer-37: Use jobs.
Question-38. How do you bring a background job to the foreground?
Answer-38: Use fg.
Question-39. How do you run a command in the background?
Answer-39: Append &, e.g., sleep 10 &.
Question-40. What does fish_config do?
Answer-40: It opens a web-based configuration tool.
Question-41. How do you change the Fish theme?
Answer-41: Run fish_config and select a theme.
Question-42. How do you install Oh My Fish (OMF)?
Answer-42: Use `curl -L https://get.oh-my.fish
Question-43. How do you install a plugin using Oh My Fish?
Answer-43: Use omf install plugin_name.
Question-44. How do you list installed Oh My Fish plugins?
Answer-44: Use omf list.
Question-45. How do you uninstall an Oh My Fish plugin?
Answer-45: Use omf remove plugin_name.
Question-46. How do you update Oh My Fish?
Answer-46: Use omf update.
Question-47. How do you disable Fish shell history?
Answer-47: Use set -U fish_history /dev/null.
Question-48. How do you clear Fish command history?
Answer-48: Use history clear.
Question-49. How do you find the full path of a command in Fish?
Answer-49: Use type -p command_name.
Question-50. How do you check all installed Fish shell versions?
Answer-50: Use fish --version.
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