Yet Another Shell

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Yet another shell (yash), version 2.18.

New features in this version includes (a) the right prompt, (b) new options for the "cd" and "pushd" builtins, and (c) non-standardized string comparison operators for the "test" builtin.

Yash 2.18

+ New operators for string comparison in the "test" builtin:
==, ===, !==, <, <=, >, >=
+ Operators "-nt" and "-ot" in the "test" builtin now compares the modification time by the nanoseconds if possible.
+ '--default-directory' option for the "cd" and "pushd" builtin.
+ '--remove-duplicates' option for the "pushd" builtin.
+ The right prompt and the styler prompt.
+ '--le-alwaysrp' option.
= The interpretation of escape sequences to change the font in $PS1 and $PS2 has been changed.
= $PS3 no longer initialized.
= Escape sequences are now interpreted in $PS4 as well as in $PS1 and $PS2.
= The "echo" and "printf" builtins now can print a null character.
* [line-editing] $LINES and $COLUMNS were wrongly ignored.
* [line-editing] fixed font color for some terminals.

Legend:
+: new feature
=: specification change
*: bug fix