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Full Discussion: Print all the directory with no directory name mydir
Top Forums UNIX for Dummies Questions & Answers Print all the directory with no directory name mydir Post 302770121 by DGPickett on Thursday 14th of February 2013 01:27:20 PM
Old 02-14-2013
Well, sometimes it is cheaper to "2>/dev/null" than to test for potential directories or files.
  • You can test inside 'for x in zzz*;do ... done' to see if x is literally "zzz*" and continue. Note that the shell does all the work expanding glob expressions like zzz* without the cost of a fork()/exec() of 'ls' or 'find'.
  • The form 'ls zzz* 2>/dev/null | while read e' does nothing if zzz* does not expand, ls errors it out on stderr and it is never read from stdout pipe stdin into e, unlike the 'for' case.
  • The 'find' command does not complain or provide unexpanded glob expressions like 'zzz*', but it goes down the tree, whereas 'ls' just does the dirs or files (and unexpanded glob expressions like 'zzz*') it is given.
Last edited by DGPickett; 02-14-2013 at 02:38 PM..
 

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LEARN ABOUT NETBSD

apm

APM(8)							    BSD System Manager's Manual 						    APM(8)

NAME

     apm, zzz -- Advanced Power Management control program

SYNOPSIS

     apm [-abdlmsSvz] [-f sockname]
     zzz [-Sz] [-f sockname]

DESCRIPTION

     The apm program communicates with the Advanced Power Management (APM) daemon, apmd(8), making requests of the current power status or placing
     the system either into suspend or stand-by state.	The apm tool is only installed on supported platforms.

     With no flags, apm displays the current power management state in verbose form.

     Available command-line flags are:
     -z 	  Put the system into suspend (deep sleep) mode.
     -S 	  Put the system into stand-by (light sleep) mode.
     -l 	  Display the estimated battery lifetime in percent.
     -m 	  Display the estimated battery lifetime in minutes.
     -b 	  Display the battery status: 0 means high, 1 means low, 2 means critical, 3 means charging, 4 means absent, and 255 means
		  unknown.
     -a 	  Display the external charger (A/C status):  0 means disconnected, 1 means connected, 2 means backup power source, and 255 means
		  unknown.
     -s 	  Display if power management is enabled.
     -v 	  Request more verbose description of the displayed states.
     -f sockname  Set the name of the socket via which to contact apmd(8) to sockname.
     -d 	  Do not communicate with the APM daemon; attempt instead to manipulate the APM control device directly.

     The zzz variant of this command is an alternative for suspending the system.  With no arguments, zzz places the system into suspend mode.
     The command line flags serve the same purpose as for the apm variant of this command.

     This command does not wait for positive confirmation that the requested mode has been entered; to do so would mean the command does not
     return until the system resumes from its sleep state.

FILES

     /var/run/apmdev is the default UNIX-domain socket used for communication with apmd(8).  The -f flag may be used to specify an alternate
     socket name.  The protection modes on this socket govern which users may access the APM functions.

     /dev/apmctl is the control device which is used when the -d flag is specified; it must be writable for the -d flag to work successfully.
     /dev/apm is the status device used when the socket is not accessible; it must be readable to provide current APM status.

SEE ALSO

     acpi(4), apm(4), apmd(8)

     Intel Corporation and Microsoft Corporation, Advanced Power Management (APM) BIOS Interface Specification, Revision 1.2, February 1996.

HISTORY

     The apm command appeared in NetBSD 1.3.

     The APM specification first appeared in 1992.  The last update to the standard was made in 1996 - the same year when it was superceded by the
     ACPI 1.0 standard.  Thereafter power management on IBM-compatible personal computers has relied on ACPI, implemented in NetBSD by the acpi(4)
     subsystem.  The acpi(4) provides an emulation layer for the legacy apm.

BSD
								  March 20, 2010							       BSD
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