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Full Discussion: execute a command silently or quietly within a shell
Top Forums Shell Programming and Scripting execute a command silently or quietly within a shell Post 302151459 by prowla on Saturday 15th of December 2007 02:10:22 PM
Old 12-15-2007
A process normally has two outputs to screen: stdout (standard out), and stderr (standard error).

Normally informational messages go to sdout, and errors and alerts go to stderr.

You can turn off stdout for a command by doing

Code:
mycommand >/dev/null

and turn off stderr by doing:

Code:
mycommand 2>/dev/null

If you want both off, you can do:

Code:
mycommand 2>&1 >/dev/null

(The 2>&1 says send stderr to the same place as stdout.)

Turning around the notes about the "-v" for verbose convention; some commands have a "-q" (quiet) option, eg. "grep -q".
 

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LEARN ABOUT DEBIAN

pipebench

pipebench(1)															      pipebench(1)

NAME

       pipebench - Shows speed of stdin/stdout communication

SYNOPSIS

       pipebench [ -ehqQIoru ] [ -s file | -S file ] [ -b bufsize ]

DESCRIPTION

       Measures the speed of stdin/stdout communication.

OPTIONS

       -h     Displays a help message and exits.

       -e     If  an error occurs, exit (breaking the pipe between stdin and stdout. By default an error message is printed to stderr and the pro-
	      gram continues.

       -q     Only show summary stats.

       -Q     Don't show running speed or summary stats. Same as -q -o. Can be used to play with buffer size.

       -o     Don't show summary.

       -b bufsize
	      Use this buffer size, in bytes.

       -r     Just show raw speed, no fancy stuff. And no summary.

       -s file
	      Write status to file instead of stderr.

       -S file
	      Write status to file instead of stderr.

       -I     Use 1kB = 1000B, instead of the default 1024B.

       -u     Don't convet to units (kilo, Mega, etc...)

EXAMPLES

       Benchmark and show progress of backup
       # (cd /home/; tar cf - .) | pipebench | (cd /mnt/backup/; tar xf -)

       A number to brag to your friends about
       $ dd if=/dev/zero bs=80k count=60k 2> /dev/null | ./pipebench -q > /dev/null

BUGS

       No known bugs... yet.

SEE ALSO

       dd(1), cat(1)

AUTHOR

       Pipebench was written by Thomas Habets <thomas@habets.pp.se>

pipebench							  18th Apr, 2003						      pipebench(1)
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