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pid(3tcl) Tcl Built-In Commands pid(3tcl) 





NAME


pid - Retrieve process identifiers






SYNOPSIS


pid ?fileId?








DESCRIPTION


If the fileId argument is given then it should normally
    refer to a process pipeline created with the open command. In this
    case the pid command will return a list whose elements are the
    process identifiers of all the processes in the pipeline, in order. The list
    will be empty if fileId refers to an open file that is not a process
    pipeline. If no fileId argument is given then pid returns the
    process identifier of the current process. All process identifiers are
    returned as decimal strings.






EXAMPLE


Print process information about the processes in a pipeline using
    the SysV ps program before reading the output of that pipeline:






set pipeline [open "| zcat somefile.gz | grep foobar | sort -u"]
# Print process information
exec ps -fp [pid $pipeline] >@stdout
# Print a separator and then the output of the pipeline
puts [string repeat - 70]
puts [read $pipeline]
close $pipeline








SEE ALSO


exec(3tcl), open(3tcl)






KEYWORDS


file, pipeline, process identifier







  

    7.0
    Tcl