Osamu Aoki wrote: > By the way, test following to understand real reason why you had > trouble ... > Your console is used by shutdown and upon killing ssh connection, > shutdown program get signal since its connected terminal dies. > Test1: > redirect STDOUT/STDERR > $ sudo shutdown -h +1 >/dev/null 2>/dev/null &
Thank you for your reply. :-) 2009-08-12 20:20:50 dpchr...@p43400e /cygdrive/u $ ssh vmdebian500 'sudo shutdown -k +1 >/dev/null 2>/dev/null &' 2009-08-12 20:20:50 dpchr...@p43400e /cygdrive/u $ That does not block. Interesting, but I don't understand how/why it works. Is this a feature of shutdown? sudo? ssh (I think not)? Something more generic (console I/O?)? Is there something I can read which explains this? > Test 2: > run shutdown in screen program. > http://www.debian.org/doc/manuals/debian-reference/ch09.en.html#_the_scr een_program 'screen' looks useful -- I'll keep it in mind. Siggy Brentrup wrote: > How about > % ssh u...@remote sudo "echo shutdown -h +1 | at now" Thank you for your reply. :-) 2009-08-12 20:38:42 dpchr...@p43400e /cygdrive/u $ ssh vmdebian500 sudo "echo shutdown -k +1 | at now" We trust you have received the usual lecture from the local System Administrator. It usually boils down to these three things: #1) Respect the privacy of others. #2) Think before you type. #3) With great power comes great responsibility. [sudo] password for dpchrist: warning: commands will be executed using /bin/sh ******** Sorry, user dpchrist is not allowed to execute '/bin/echo shutdown -k +1' as root on vmdebian500.localdomain. job 20 at Thu Aug 13 00:40:00 2009 This variation seems to work: 2009-08-12 20:39:11 dpchr...@p43400e /cygdrive/u $ ssh vmdebian500 echo "sudo shutdown -k +1 | at now" warning: commands will be executed using /bin/sh job 21 at Thu Aug 13 00:41:00 2009 But, I don't understand why. I would expect echo to print "sudo shutdown -k +1 | at now" on stdout and exit. But, shutdown and at ran on the remote host... (?) This variation does not work: 2009-08-12 20:40:07 dpchr...@p43400e /cygdrive/u $ ssh vmdebian500 echo "sudo shutdown -k +1" | at now Invalid command. The AT command schedules commands and programs to run on a computer at a specified time and date. The Schedule service must be running to use the AT command. AT [\\computername] [ [id] [/DELETE] | /DELETE [/YES]] AT [\\computername] time [/INTERACTIVE] [ /EVERY:date[,...] | /NEXT:date[,...]] "command" \\computername Specifies a remote computer. Commands are scheduled on the local computer if this parameter is omitted. id Is an identification number assigned to a scheduled command. /delete Cancels a scheduled command. If id is omitted, all the scheduled commands on the computer are canceled. /yes Used with cancel all jobs command when no further confirmation is desired. time Specifies the time when command is to run. /interactive Allows the job to interact with the desktop of the user who is logged on at the time the job runs. /every:date[,...] Runs the command on each specified day(s) of the week or month. If date is omitted, the current day of the month is assumed. /next:date[,...] Runs the specified command on the next occurrence of the day (for example, next Thursday). If date is omitted, the current day of the month is assumed. "command" Is the Windows NT command, or batch program to be run. I believe echo ran on the remote host, printed "sudo shutdown -k +1" on stdout, which ssh piped to at on my local host (Vista/Cygwin), which can't handle commands arriving on stdin. The AT spew matches: 2009-08-12 20:56:10 dpchr...@p43400e /cygdrive/u $ /cygdrive/c/Windows/system32/at /? This variation works, and makes the most sense to me: $ ssh vmdebian500 'echo "sudo shutdown -k +1" | at now' warning: commands will be executed using /bin/sh job 22 at Thu Aug 13 00:47:00 2009 Echo runs on the remote host, piping "sudo shutdown -k +1" to the at command on the remote host, which runs the (delayed) shutdown command immediately. No intermediate file, no chmod -- nice! :-) David -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
