I finally actually read the first part of the man page for at and found the reference to /bin/sh. Duh. I'll give the single line that calls the real script a try . . . thanks.
On 10/25/2010 11:53 AM, chris (fool) mccraw wrote: > On Mon, Oct 25, 2010 at 11:27, frankhunt<[email protected]> wrote: >> Does the "at" scheduler use bash or dash? > mine (ubuntu 10.4 still) uses /bin/sh as documented in the first line > of the at(1) man page. on my system, /bin/sh is linked to dash rather > than bash. i believe there have been other conversations on here > about relinking /bin/sh to bash and how it breaks things, so that's > probably not a good fix. plus, when run as 'sh', bash behaves like > its slower older brother posix bourne shell--see > http://www.gnu.org/software/bash/manual/html_node/Bash-POSIX-Mode.html. > > Ideas?? > a fine point of at(1) job submission that i just discovered from the > same man page, is that if you submit a file, it is treated as a list > of commands, run via /bin/sh. if you submit from standard in, it will > instead just run the command, which if it is a script will obey your > opening shebang line. i just tested that and it works fine (run: at > now +4 hours, type in the path to your script, hit control d, or just > "echo /path/to/script | at now +4 hours). you can put the calculated > time specification into the command line that runs at, rather than in > the script itself, maybe? i'd use expr(1) with date(1) to do it > rather than the shell builtin 'let'. you could use date +%s to grab > number of seconds since the epoch as a source of a number that won't > be the same twice (unless you execute your script twice in one > second). > > i guess another workaround is to submit a file that just has one line > that runs the other script (with the bash-specific shell functions in, > starting with #!/bin/bash), if you really must submit a file rather > than using stdin. > > luck++; > -- frank hunt (L0F) R0B-ZAR1 befuddled linux admin erstwhile photographer hillsboro oregon _______________________________________________ PLUG mailing list [email protected] http://lists.pdxlinux.org/mailman/listinfo/plug
