~- is the value of the shell variable OLDPWD, so you can list out your previous directory with ls ~- . Saves a little time from having to type all the extra characters in cd - && ls && cd - .
But since it holds the actual directory path, it's even more useful because you can quickly list out any subdirs with ls ~-/oldPwdSubDir/anotherSubdir
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~- is the value of the shell variable
OLDPWD, so you can list out your previous directory with ls ~- . Saves a little time from having to type all the extra characters in cd - && ls && cd - .But since it holds the actual directory path, it's even more useful because you can quickly list out any subdirs with ls ~-/oldPwdSubDir/anotherSubdir