05-15-2018
You are piping the command's stdout to grep and then redirecting grep's stderr to the null device. Where does the command's stderr go to?
EDIT: Alternatively, make it all a "compound command":
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GRC(1) General Commands Manual GRC(1)
NAME
grc - frontend for generic colouriser grcat(1)
SYNOPSIS
grc [options] command [args]
DESCRIPTION
grc will execute command command with optional parameters [args] piping its stdout or stderr into grcat, with apropriate configuration
file.
Configuration file for grc is determined by /etc/grc.conf file.
Format of /etc/grc.conf: each entry consists of 2 lines, between entries there can be any number of empty lines or lines beginning with #
(comments)
First line is regular expression, second line the name of configuration file for grcat.
Configuration file after the first regular expression matching command [args] will be passed to grcat as its configuration file
OPTIONS
--help Show summary of options.
--version
Display version.
-e --stderr
Redirect error output. Unless -s is selected as well, this cancels redirection of standard output via grcat
-s --stdout
Redirect standard output. Used to redirect standard output together with --stderr option.
--colour=x
x is one of on off auto
--colour=on will colourise (default)
--colour=off will just execute command without colourising.
--colour=auto will test if standard output is a tty, and colourise only when it is.
SEE ALSO
grcat(1)
AUTHOR
Written by Radovan Garabik <garabik @ kassiopeia.juls.savba.sk>
GRC(1)