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Top Forums Shell Programming and Scripting How get program name that produced an IO error redirected to a LOG in a nohup command? Post 302765415 by enriquegm82 on Saturday 2nd of February 2013 09:55:01 AM
Old 02-02-2013
Question

Quote:
Originally Posted by Don Cragun
You have 4 commands that are using redirection:
Code:
nohup nice -10 programA 2>&1 > logfileA.txt
nohup nice -10 program1a 2>&1 > logfile1a.txt
nohup nice -10 program1b 2>&1 > logfile1b.txt
nohup nice -10 program1c 2>&1 > logfile1c.txt

You need to change the order of redirections on all four of them to:
Code:
nohup nice -10 programA > logfileA.txt 2>&1
nohup nice -10 program1a > logfile1a.txt 2>&1
nohup nice -10 program1b > logfile1b.txt 2>&1
nohup nice -10 program1c > logfile1c.txt 2>&1

Plz one question, why changing the order of redirection would make a difference? what is the meaning of "2>&1" ? I think that 2>&1 is telling that standard error becomes standard output and logges to the same outer log, meaning log to "logFileA.txt" instead of the 3 inner log files.

I changed the redirection in the four command lines and it is still logging the Error Message to the Outer Log (logFileA.txt). How could I make it to log the Error to the 3 inner log files?
 

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NICE(1) 						      General Commands Manual							   NICE(1)

NAME
nice, nohup - run a command at low priority (sh only) SYNOPSIS
nice [ -number ] command [ arguments ] nohup command [ arguments ] DESCRIPTION
Nice executes command with low scheduling priority. If the number argument is present, the priority is incremented (higher numbers mean lower priorities) by that amount up to a limit of 20. The default number is 10. The super-user may run commands with priority higher than normal by using a negative priority, e.g. `--10'. Nohup executes command immune to hangup and terminate signals from the controlling terminal. The priority is incremented by 5. Nohup should be invoked from the shell with `&' in order to prevent it from responding to interrupts by or stealing the input from the next per- son who logs in on the same terminal. FILES
nohup.out standard output and standard error file under nohup SEE ALSO
csh(1), setpriority(2), renice(8) DIAGNOSTICS
Nice returns the exit status of the subject command. BUGS
Nice and nohup are particular to sh(1). If you use csh(1), then commands executed with ``&'' are automatically immune to hangup signals while in the background. There is a builtin command nohup which provides immunity from terminate, but it does not redirect output to nohup.out. Nice is built into csh(1) with a slightly different syntax than described here. The form ``nice +10'' nices to positive nice, and ``nice -10'' can be used by the super-user to give a process more of the processor. 4th Berkeley Distribution May 8, 1986 NICE(1)
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