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Top Forums Shell Programming and Scripting Lost redirecting stderr & stdout to 3 files - one each plus combined Post 303010486 by MDominok on Tuesday 2nd of January 2018 08:39:54 AM
Old 01-02-2018
Lost redirecting stderr & stdout to 3 files - one each plus combined

Hi folks

I need/want to redirect output (stdout, stderr) from an exec call to separate files. One for stderr only and two(!) different (!) ones for the combined output of stderr and stdout.

After some research and testing i got this so far :

Code:
(( exec ${command} ${command_parameters} 3>&1 1>&2 2>&3 ) | tee -a ${FILE_LOG_TEMPORARY}.stderr ) >> ${FILE_LOG_TEMPORARY} 2>&1

So got my stderr and one stdout+stderr log files and only need a "copy" of FILE_LOG_TEMPORARY, sort of
Code:
(( exec ${command} ${command_parameters} 3>&1 1>&2  2>&3 ) | tee -a ${FILE_LOG_TEMPORARY}.stderr ) >>  ${FILE_LOG_TEMPORARY} 2>&1 | tee -a ${FILE_LOG_GLOBAL}

But lot's of monochrome '&'s, '>'s and 'tee's that are enganged in some sort of high speed rain dance in front of my eyes are keeping me from seeing the solution right now. 8-)

And yes, simply copying the file after exec finished is Plan B...
Plan A is to have (many) ${command}s log into a global file (for tail -f'ing) and single files for run control/archiving.

To make matters worse i need to run the script on Solaris(ksh88, which wont accept my "solution" above so far), SuSE (ksh93) and Redhat (ksh93).

Cheers and thanks for all hints!

Michael
 

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FD(4)							   BSD Kernel Interfaces Manual 						     FD(4)

NAME
fd, stdin, stdout, stderr -- file descriptor files DESCRIPTION
The files /dev/fd/0 through /dev/fd/# refer to file descriptors which can be accessed through the file system. If the file descriptor is open and the mode the file is being opened with is a subset of the mode of the existing descriptor, the call: fd = open("/dev/fd/0", mode); and the call: fd = fcntl(0, F_DUPFD, 0); are equivalent. Opening the files /dev/stdin, /dev/stdout and /dev/stderr is equivalent to the following calls: fd = fcntl(STDIN_FILENO, F_DUPFD, 0); fd = fcntl(STDOUT_FILENO, F_DUPFD, 0); fd = fcntl(STDERR_FILENO, F_DUPFD, 0); Flags to the open(2) call other than O_RDONLY, O_WRONLY and O_RDWR are ignored. IMPLEMENTATION NOTES
By default, /dev/fd is provided by devfs(5), which provides nodes for the first three file descriptors. Some sites may require nodes for additional file descriptors; these can be made available by mounting fdescfs(5) on /dev/fd. FILES
/dev/fd/# /dev/stdin /dev/stdout /dev/stderr SEE ALSO
tty(4), devfs(5), fdescfs(5) BSD
June 9, 1993 BSD
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