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Full Discussion: piping output to echo
Top Forums Shell Programming and Scripting piping output to echo Post 302094791 by srikanthus2002 on Wednesday 1st of November 2006 05:06:08 AM
Old 11-01-2006
echo
The echo command echoes its arguments. Here are some examples:

Code:
% echo this
     this
   % echo $EDITOR
     /usr/local/bin/emacs
   % echo $PRINTER
     b129lab1

Things like PRINTER are so-called environment variables. This one stores the name of the default printer --- the one that print jobs will go to unless you take some action to change things. The dollar sign before an environment variable is needed to get the value in the variable. Try the following to verify this:

% echo PRINTER
PRINTER

----------------------------

you can use " ls " command in the following way

Code:
ls * | pg  #or
ls * | more

 

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LEARN ABOUT NETBSD

lprm

LPRM(1) 						    BSD General Commands Manual 						   LPRM(1)

NAME

     lprm -- remove jobs from the line printer spooling queue

SYNOPSIS

     lprm [-] [-P printer] [-w maxwait] [job# ...] [user ...]

DESCRIPTION

     lprm will remove a job, or jobs, from a printer's spool queue.  Since the spooling directory is protected from users, using lprm is normally
     the only method by which a user may remove a job.	The owner of a job is determined by the user's login name and host name on the machine
     where the lpr(1) command was invoked.

     Options and arguments:

     -Pprinter
	     Specify the queue associated with a specific printer (otherwise the default printer is used).

     -w maxwait
	     Specify the maximum time to wait in seconds for remote responses.	The default is 300 seconds or 5 minutes.

     -	     If a single '-' is given, lprm will remove all jobs which a user owns.  If the super-user employs this flag, the spool queue will be
	     emptied entirely.

     user    Causes lprm to attempt to remove any jobs queued belonging to that user (or users).  This form of invoking lprm is useful only to the
	     super-user.

     job #   A user may dequeue an individual job by specifying its job number.  This number may be obtained from the lpq(1) program, e.g.

		   % lpq -l

		   1st:ken			   [job #013ucbarpa]
			   (standard input)	   100 bytes
		   % lprm 13

     If neither arguments or options are given, lprm will delete the currently active job if it is owned by the user who invoked lprm.

     lprm announces the names of any files it removes and is silent if there are no jobs in the queue which match the request list.

     lprm will kill off an active daemon, if necessary, before removing any spooling files.  If a daemon is killed, a new one is automatically
     restarted upon completion of file removals.

ENVIRONMENT

     If the following environment variable exists, it is used by lprm.

     PRINTER  If the environment variable PRINTER exists, and a printer has not been specified with the -P option, the default printer is assumed
	      from PRINTER.

FILES

     /etc/printcap		Printer characteristics file.
     /var/spool/output/*	Spooling directories.
     /var/spool/output/*/lock	Lock file used to obtain the pid of the current daemon and the job number of the currently active job.

DIAGNOSTICS

     ``Permission denied'' if the user tries to remove files other than his own.

SEE ALSO

     lpq(1), lpr(1), lpd(8)

HISTORY

     The lprm command appeared in 3.0BSD.

BUGS

     Since there are race conditions possible in the update of the lock file, the currently active job may be incorrectly identified.

BSD
								   June 6, 1993 							       BSD
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