input from a file for 'ed'
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From: Ariful Hossain on 18 Jul 2010 04:50 Can anyone explain what happens $ed<temp it ends up with a ken thompson's infamaous '?' certainly first temp is created if not existed previously. and it may also suppy an EOF(if read systemcall is called first). But i'm lost why it behaves in this way? -- Freeburn life in a NIX shell Registered linux user #517617 -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org Archive: http://lists.debian.org/1279441596.2432.12.camel(a)freeburn
From: Bob Proulx on 18 Jul 2010 08:50
Ariful Hossain wrote: > Can anyone explain what happens > $ed<temp Two possibilities. You are at a command prompt "$" and are invoking the 'ed' text editor and redirecting input from a file "temp". Or you are running a command "$ed" where $ed is an environment variable of unknown content and redirecting the input from a file "temp". Without any spaces or other information it isn't possible to tell the difference. > it ends up with a ken thompson's infamaous '?' What are the contents of the file "temp"? That is providing command input to your 'ed' command. Since you haven't shown us what your ed script is telling 'ed' to do it isn't possible to know. > certainly first temp is created if not existed previously. Huh? You say certainly as if we should know what the commands in "temp" do. Please show us the temp file that we may know what commands are being executed. > and it may also suppy an EOF(if read systemcall is called first). > But i'm lost why it behaves in this way? You have not yet shown us enough information to help you. Bob |