ubuntu - Redirection of standard input seems to change behaviour of Dyalog APL program (when calling mapl using symbolic link named dyalog) -


i trying learn apl (both apl in general , dyalog apl, seems actively under development , in use here in stockholm).

when doing so, have observed, in ubuntu linux environment, dyalog (in fact file called mapl, reached through symbolic link named /usr/bin/dyalog) seems behave differently when having stdin associated pipe or open disk file instead of terminal driver.

it seems interpreter no longer understands ]display when replace terminal driver pipe standard input.

here ]display command/function seems work :

command: dyalog without arguments or stdin redirection :  dyalog apl/s-64 version 16.0.30320 unicode edition mon aug 14 19:27:14 2017       ]display 42  42

here, interpreter seems confused ]display :

root@lenovo201707:/home/u/20170814# ( echo "]display 42" ; echo ")off" ) |         dyalog dyalog apl/s-64 version 16.0.30320 unicode i86_64 created: jul  7 2017 @ 02:48:48 copyright (c) dyalog limited 1982-2017       ]display 42  value error root@lenovo201707:/home/u/20170814#

is there simple way not lose ]display function when loading , executing apl code existing utf-8 encoded file ?

best regards ! hans davidsson

updated answer: following should solve request:

( echo "]display 42" ; echo ")off" ) |  /opt/mdyalog/16.0/64/unicode/mapl salt

the detail has changed we're loading salt-workspace before attempting execute ucmd. salt (through ⎕lx) set environment can handle ucmds.

my initial reply: i'm windows-user , must admit never worked linux pipes, can't general mechanism.

but have answer specific question re. ]display: may call ucmd under program control using ⎕se.ucmd'{ucmd & args}', example: ⎕se.ucmd'display ⍳3 3'

btw, call ⎕se.dyalog.utils.disp myvar avoids ucmd-mechanism , easier use when calling fn.


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