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Operating Systems Linux Ubuntu What it means $who >> $logfile 2>&1 ? Post 302345329 by chompy on Wednesday 19th of August 2009 02:32:36 AM
Old 08-19-2009
$who and $logfile = a script variable, defined by the writer. Would have to see more of the script to tell you.

>> = append the output of a command (or in your case, value of the $who variable) to the end of a file.

2>&1 means to direct both STDOUT and STDERR to the same place, typically for logging purposes or even to suppress output of a script (like with cron)

In conclusion, it will append STDOUT and STDERR of $who to $logfile

Last edited by chompy; 08-19-2009 at 03:34 AM.. Reason: Forgot my conclusion
 

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cachefslog(1M)															    cachefslog(1M)

NAME
cachefslog - Cache File System logging SYNOPSIS
logfile| cachefs_mount_point DESCRIPTION
The command is used to enable or disable logging for a cachefs_mount_point. When the command is used without any options, it displays the logfile. The logfile contains information on the operation performed on a cachefs_mount_point and statistics used by to get the working set size of cache directory. The specified logfile will contain information for all the CacheFS mount points using the same cache direc- tory. A logfile and a cache directory have a 1-to-1 mapping; that is, even if a cache directory is removed and recreated with the same name, the logfile used in the previous instance of the cache directory cannot be reused with the new cache directory. Enabling logging may have performance impact, even if minimal, on the operations for all the CacheFS mount points using the same cache directory. The command is mainly used for debugging purposes. Options The following options are supported. You must be a superuser to use the and options. Specify the logfile to be used. Halt logging. Operands cachefs_mount_point A mount point of a cache file system. RETURN VALUE
returns the following values: Success. non-zero An error occurred. EXAMPLES
1. Checking the logging of a directory. This example checks if the CacheFS file system is being logged: 2. Changing the logfile. This example changes the logfile of to 3. Verifying the change of a logfile. This example verifies the change of the previous example: 4. Halting the logging of a directory. This example halts logging for the directory: AUTHOR
was developed by Sun Microsystems, Inc. SEE ALSO
cachefsstat(1M), cachefswssize(1M), cfsadmin(1M). cachefslog(1M)
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