Redirect STDOUT & STDERR to file and then on screen Post: 303023906

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Top Forums Shell Programming and Scripting Redirect STDOUT & STDERR to file and then on screen Post 303023906 by Peasant on Tuesday 25th of September 2018 10:58:21 AM

Old

09-25-2018

Moderator

You will need to restore file descriptors to their original values.
This can be done from inside the script in point of code you like.

During runtime, outside of the script, possibly with some gdb hackery, but i would advise against it.

Example for both operations can be found by searching keywords above.

Hope that helps.
Regards
Peasant.

Peasant

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LEARN ABOUT HPUX

cmscancl

cmscancl(1m)															      cmscancl(1m)

NAME

       cmscancl - gather system configuration information from nodes with Serviceguard installed.

SYNOPSIS

       cmscancl [-n node_name]...  [-s|-o output_file]

DESCRIPTION

       cmscancl is a configuration report and diagnostic tool intended only for use by HP Support Personnel.  It gathers system software and hard-
       ware configuration information from a list of nodes, or from all the nodes in a	cluster.   The	information  that  this  command  displays
       includes  LAN  device  configuration,  network status and interfaces, file systems, LVM configuration, link-level connectivity (HPUX only),
       IPv4/IPv6 connectivity, and the data from the binary cluster configuration file.  This command can be used as a troubleshooting tool or	as
       a data collection tool.

       This command is a Perl script which gathers system configuration information by executing various OS commands or tools.	It uses the cmexec
       command to gather information from remote nodes.

       The -n option can be used to specify a list of nodes to be scanned, the nodes to be scanned do not need to be a member of  a  cluster.	If
       the -n option is not specified, it will scan all the nodes in the local cluster.

       By  default, the output of this command will go to the file /tmp/scancl.out.  If the file /tmp/scancl.out already exists, the old file will
       be saved in /tmp/scancl.out.old.

       The -o option can be used to redirect output to a specified output file.  If the -o option is not specified, output will go to the  default
       output file /tmp/scancl.out.

       The -s option can be used to direct all output to the screen, instead of to an output file.

   Options
       cmscancl supports the following options:

	      -n node_name...  Specify	the  node(s)  to  be  scanned.	If this option is not specified and there is a cluster configured, all the
			       nodes in the cluster will be scanned.  If this option is not specified and there is no cluster configured, only the
			       local node will be scanned.

	      -o  output_file  Write  configuration information to a specified output file.  If this option is not specified, the information will
			       be directed to stdout.

	      -s	       Display the configuration information to the screen only.  This option cannot be used in conjunction  with  the	-o
			       option.

       The output from this command contains the following information:

	      LAN device configuration	    (On HP-UX, output from lanscan; On Linux, output from ifconfig)

	      network status and interfaces (output from netstat)

	      file systems		    (output from mount)

	      LVM configuration 	    (contents of /etc/lvmtab file)

	      LVM physical vg information   (contents of /etc/lvmpvg file)

	      link-level connectivity (HP-UX only)
					    (output from linkloop)

	      IPv4/IPv6 connectivity	    (results from ping (and ping6 on Linux))

	      binary configuration file data
					    (output from cmviewconf)

RETURN VALUE

       cmscancl returns the following value:

	      0    Successful completion.
	      1    Command failed.

EXAMPLES

       To gather the configuration information from node1 and node2 and to save the output in file /tmp/scancl.log:

		 cmscancl -n node1 -n node2 -o /tmp/myscancl.log

       To gather the configuration information from all the nodes in the cluster and save the output to the file: /tmp/scancl.log:

		 cmscancl -o /tmp/myscancl.log

       To gather the configuration information from all the nodes in the cluster and display the output on the screen:

		 cmscancl -s

       To gather the configuration information from all the nodes in the cluster and save the output to the file /tmp/scancl.out:

		 cmscancl

AUTHOR

       cmscancl was developed by HP.

SEE ALSO

       Linux:
	 cmviewcl(1), mount(8), netstat(8), ping(8), ping6(8)
       HP-UX:
	 cmviewcl(1m), lanscan(1m), linkloop(1m), mount(1m), netstat(1), ping(1m)

						      Requires Optional Serviceguard Software					      cmscancl(1m)