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Full Discussion: How does ||: evaluate?
Top Forums UNIX for Dummies Questions & Answers How does ||: evaluate? Post 302755075 by jim mcnamara on Friday 11th of January 2013 06:22:34 PM
Old 01-11-2013
: evaluates in POSIX shells to the result of /usr/bin/true or true.

It is used like that to override a return status value that would affect subsequent processing.

For example, in Appworx (a batch control system) a false return code almost anywhere is detectable, so that if ||: were not there at the end of a line, appworx may see a false return and abort the job when the child process returns. Even though the job may have completed correctly.

Don't ask how, I'd have to guess.
 

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GLOBUS-JOB-STATUS(1)						  GRAM5 Commands					      GLOBUS-JOB-STATUS(1)

NAME
globus-job-status - Check the status of a GRAM5 job SYNOPSIS
globus-job-status JOBID globus-job-status [-help] [-usage] [-version] [-versions] DESCRIPTION
The globus-job-status program checks the status of a GRAM job by sending a status request to the job manager contact for that job specifed by the JOBID parameter. If successful, it will print the job status to standard output. The states supported by globus-job-status are: PENDING The job has been submitted to the LRM but has not yet begun execution. ACTIVE The job has begun execution. FAILED The job has failed. SUSPENDED The job is currently suspended by the LRM. DONE The job has completed. UNSUBMITTED The job has been accepted by GRAM, but not yet submitted to the LRM. STAGE_IN The job has been accepted by GRAM and is currently staging files prior to being submitted to the LRM. STAGE_OUT The job has completed execution and is currently staging files from the service node to other http, GASS, or GridFTP servers. OPTIONS
The full set of options to globus-job-status are: -help, -usage Display a help message to standard error and exit. -version Display the software version of the globus-job-status program to standard output. -versions Display the software version of the globus-job-status program including DiRT information to standard output. ENVIRONMENT
If the following variables affect the execution of globus-job-status. X509_USER_PROXY Path to proxy credential. X509_CERT_DIR Path to trusted certificate directory. BUGS
The globus-job-status program can not distinguish between the case of the job manager terminating for any reason and the job being in the DONE state. SEE ALSO
globusrun(1) University of Chicago 03/18/2010 GLOBUS-JOB-STATUS(1)
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