Preface: this is somewhat trivial.
Context: I was logged into a remote server, doing some filesystem space calculations using GNU APL as my preferred shell 'calculator', using the --eval option, while located in a directory where writing is restricted for regular users (here the /ext0 volume):
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russtopia@tripe /ext0 $ apl --eval "+/ 12 552 14 20 262 254 7.2"
1121.2
Cannot write history file .apl.history: Permission denied
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Since --eval seems intended to enable use of the APL interpreter outside of any workspace, might it be better to avoid writing to .apl.history when this flag is specified?