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Top Forums Shell Programming and Scripting [ ! -e a.log ] & [ ! -f a.log ] difference b/w these two Post 302269762 by himvat on Thursday 18th of December 2008 02:56:40 PM
Old 12-18-2008
[ ! -e a.log ] & [ ! -f a.log ] difference b/w these two

Code:
if [ ! -e a.log ]; then
        touch a.log
fi

...................................

if [ ! -f a.log ]; then
        touch a.log
fi

Hi ,

Are the above two meant for same purpose i.e finding & creating a.log ?

I would really appreciate if you could explain the purpose of " ! " & " -f "
in these .

thanks
 

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FSTRACE_CLEAR(8)					       AFS Command Reference						  FSTRACE_CLEAR(8)

NAME
fstrace_clear - Clears the trace log SYNOPSIS
fstrace clear [-set <set name>+] [-log <log name>+] [-help] fstrace c [-s <set name>+] [-l <log name>+] [-h] DESCRIPTION
The fstrace clear command erases the contents of the trace log from kernel memory, but leaves kernel memory allocated for the log. OPTIONS
-set <set name>+ Names the event set for which to clear the associated trace log. The only acceptable value is "cm" (for which the associated trace log is "cmfx"). Provide either this argument or the -log argument, or omit both to clear the "cmfx" log by default. -log <log name>+ Names the trace log to clear. The only acceptable value is "cmfx". Provide either this argument or the -set argument, or omit both to clear the "cmfx" log by default. -help Prints the online help for this command. All other valid options are ignored. EXAMPLES
The following command clears the "cmfx" trace log on the local machine: # fstrace clear PRIVILEGE REQUIRED
The issuer must be logged in as the local superuser "root". SEE ALSO
fstrace(8), fstrace_lslog(8), fstrace_lsset(8) COPYRIGHT
IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved. This documentation is covered by the IBM Public License Version 1.0. It was converted from HTML to POD by software written by Chas Williams and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell. OpenAFS 2012-03-26 FSTRACE_CLEAR(8)
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