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Top Forums UNIX for Dummies Questions & Answers Quick question Post 302095061 by JohnnyBoy on Friday 3rd of November 2006 07:09:17 AM
Old 11-03-2006
Quick question

Hello all,

Quick question from a fairly new to Unix developer.

if [ -a $logfile ]
then
completedLogFile=$logfile.$(date +%Y%m%d-%H:%M:%S)
mv $logfile $completedLogFile
fi

I understand that this portion of code is simply copying a tmp logfile to a completed logfile when a condition is true. The problem is I'm not sure what the comparative expression is(the part in bold). Could any one clear this up for me?

Thanks in advance,

Johnny
 

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LOGSAVE(8)                                                    System Manager's Manual                                                   LOGSAVE(8)

NAME
logsave - save the output of a command in a logfile SYNOPSIS
logsave [ -asv ] logfile cmd_prog [ ... ] DESCRIPTION
The logsave program will execute cmd_prog with the specified argument(s), and save a copy of its output to logfile. If the containing directory for logfile does not exist, logsave will accumulate the output in memory until it can be written out. A copy of the output will also be written to standard output. If cmd_prog is a single hyphen ('-'), then instead of executing a program, logsave will take its input from standard input and save it in logfile logsave is useful for saving the output of initial boot scripts until the /var partition is mounted, so the output can be written to /var/log. OPTIONS
-a This option will cause the output to be appended to logfile, instead of replacing its current contents. -s This option will cause logsave to skip writing to the log file text which is bracketed with a control-A (ASCII 001 or Start of Header) and control-B (ASCII 002 or Start of Text). This allows progress bar information to be visible to the user on the console, while not being written to the log file. -v This option will make logsave to be more verbose in its output to the user. AUTHOR
Theodore Ts'o (tytso@mit.edu) SEE ALSO
fsck(8) E2fsprogs version 1.44.1 March 2018 LOGSAVE(8)
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