Shell variables

[magicant]

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Default-assigned variables:

• [x] Default $IFS
• [x] Default $OPTIND
• [x] Default $PPID
• [x] Default $PS1
• [x] Default $PS2
• [x] Default $PS4
• [x] Default $PWD #218
• [ ] Default $YASH_LOADPATH
• [ ] Default $YASH_VERSION

Variables with a quirk:

• [x] Dynamically computing $LINENO #224
• [ ] Expanding $RANDOM
• [ ] Clearing $PATH on assignment

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Variables tracked in other tasks:

• $COMMAND_NOT_FOUND_HANDLER → Command semantics
• $DIRSTACK → dirs, pushd and popd built-ins
• $ECHO_STYLE → echo built-in
• $ENV → Shell startup
• $FCEDIT → fc built-in
• $HISTFILE and $HISTSIZE → History
• $HOME → Tilde expansion
• $IFS → Field splitting
• $MAIL, $MAILCHECK and $MAILPATH → Mail check
• $OLDPWD → cd built-in
• $OPTARG → getopts built-in
• $PATH → Command search
• $YASH_AFTER_CD → cd and pushd built-ins
• Locale parameters $LANG and $LC_... → Locale

Variables not planned for implementation:

• $NLSPATH → yash-rs will use a different locale mechamism