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Full Discussion: Is there a way to tee stderr from a command that's redirecting error to a file?
Top Forums Shell Programming and Scripting Is there a way to tee stderr from a command that's redirecting error to a file? Post 302355339 by sumgi on Tuesday 22nd of September 2009 10:39:03 AM
Old 09-22-2009
Is there a way to tee stderr from a command that's redirecting error to a file?
I'm not a complete novice at unix but I'm not all that advanced either. I'm hoping that someone with a little more knowledge than myself has the answer I'm looking for.

I'm writing a wrapper script that will be passed user commands from the cron...

Ex:
Code:
./mywrapper.sh "/usr/bin/ps -ef | grep foo > log/ps.out 2>&1"

The wrapper will execute them from the cron and log start and stop times and any errors or exit codes.

Question:
However in the case as above that a user is redirecting their errors to their own log file is there a good way to sample the error such that both the user log and the wrapper log get the error message?

Let me know if you need more info, thanks!

Currently I am grabbing the stderr away from the user command and sending it to a temp file. However this method removes the error from the user log.

Ex:
Code:
eval "$1 2> temp.err"
ERR=`cat temp.err`
rm temp.err

Last edited by sumgi; 09-22-2009 at 02:05 PM..
 

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LEARN ABOUT CENTOS

jfs_fscklog

jfs_fscklog(8)						   Extract/Display JFS fsck Log 					    jfs_fscklog(8)

NAME

       jfs_fscklog - extract a JFS fsck service log into a file and/or format and display the extracted file

SYNOPSIS

       jfs_fscklog [ -d ] [ -e device ] [ -f output.file ] [ -p ] [ -V ]

DESCRIPTION

       jfs_fscklog  with option -e device extracts the contents of either the most recent or immediately prior (specified with option -p) JFS fsck
       service log from the specified device, and writes the output to a file.	The file name may be specified with the -f option, or the  default
       file name is <pwd>fscklog.new.  If the -p option is used, the default file name is <pwd>fscklog.old.

       jfs_fscklog with option -d formats and displays the contents of the extracted file.

       jfs_fscklog with options -d and -e device extracts and displays the JFS fsck service log.

OPTIONS

       -d     Format and display a previously extracted JFS fsck service log.

       -e device
	      Extract  the  JFS fsck service log from device and store it in a file.  (device is the special file name corresponding to the actual
	      device from which the fsck log will be extracted (e.g.  /dev/hdb1 )).

       -f file.name
	      Specify the file name, overriding the default file name.	When used with -e device, file.name specifies the name of  the	file  into
	      which the JFS fsck log will be extracted.  When used with -d, file.name specifies the name of the extracted file whose contents will
	      be formatted and displayed.

	      file.name must be 127 characters or less in length.

	      file.name will be created in the present working directory unless it is fully qualified.

       -p     Extract the prior log (as opposed to the most recent log).

       -V     Print version information and exit (regardless of any other chosen options).

EXAMPLES

	Extract the most recent JFS fsck log on /dev/hda5 into <pwd>fscklog.new:

	      jfs_fscklog -e /dev/hda5

       Extract the most recent JFS fsck log on /dev/hdb3 into /temp/l9651107.log:

	      jfs_fscklog -e /dev/hdb3 -f /temp/l9651107.log

       Display the JFS fsck log that was extracted into /temp/l9651107.log:

	      jfs_fscklog -d -f /temp/l9651107.log

       Extract and display the previous JFS fsck log from /dev/hda8:

	      jfs_fscklog -e /dev/hda8 -d -p

REPORTING BUGS

       If you find a bug in JFS or jfs_fscklog, please report it via the bug tracking system ("Report Bugs" section) of the JFS project web site:
       http://jfs.sourceforge.net/

       Please send as much pertinent information as possible, including any jfs_fscklog error messages and the complete output of running jfs_fsck
       with the -v option on the JFS device.

SEE ALSO

       jfs_fsck(8), jfs_mkfs(8), jfs_tune(8), jfs_logdump(8), jfs_debugfs(8)

AUTHOR

       Barry Arndt  (barndt@us.ibm.com)

       jfs_fscklog is maintained by IBM.
       See the JFS project web site for more details:
       http://jfs.sourceforge.net/

								 October 28, 2002						    jfs_fscklog(8)
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