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Full Discussion: Help with diff command
Top Forums UNIX for Dummies Questions & Answers Help with diff command Post 302895499 by Subbeh on Tuesday 1st of April 2014 05:11:01 AM
Old 04-01-2014
Quote:
Originally Posted by John K
Thank You Subbeh.

Two questions:
1. What is the role of less than character in red below ?

2. What is the role of double pipe operater ?

Code:
$ diff <(sort a.txt) <(sort b.txt) || echo 'there is a difference'
1a2
> NETHERLANDS

1. The '<' character is used to redirect the output of sort to the diff utility. This is needed if you're not specifying a file directly to diff.

2. || is equal to OR, && is equal to AND. In this case it means that if the diff command was succesfull, echo there is no difference (AND). If the diff command was not succesfull, echo that there is a difference (OR).

Hope this clears it up for you.
This User Gave Thanks to Subbeh For This Post:
John K
 

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LEARN ABOUT CENTOS

secolor.conf

secolor.conf(8) 					      System Manager's Manual						   secolor.conf(8)

NAME

       secolor.conf - The SELinux color configuration file

DESCRIPTION

       The  /etc/selinux/{SELINUXTYPE}/secolor.conf  configuation file controls the color to be associated to the context components associated to
       the raw context passed by selinux_raw_context_to_color(3), when context related information is to be displayed in color by an SELinux-aware
       application.

       selinux_raw_context_to_color(3)	obtains  this  color  information  from  the  active  policy secolor.conf file as returned by selinux_col-
       ors_path(3).

FILE FORMAT

       The file format is as follows:
	      color color_name = #color_mask
	      [...]

	      context_component string = fg_color_name bg_color_name
	      [...]

       Where:
       color
	      The color keyword. Each color entry is on a new line.
       color_name
	      A single word name for the color (e.g. red).
       color_mask
	      A color mask starting with a hash (#) that describes the hexadecimal RGB colors with black being #000000 and white being #ffffff.
       context_component
	      The context component name that must be one of the following:
		     user, role, type or range
	      Each context_component string ...  entry is on a new line.
       string
	      This is the context_component string that will be matched with the raw context component passed by selinux_raw_context_to_color(3).
	      A wildcard '*' may be used to match any undefined string for the user, role and type context_component entries only.

       fg_color_name
	      The color_name string that will be used as the foreground color.	A color_mask may also be used.
       bg_color_name
	      The color_name string that will be used as the background color.	A color_mask may also be used.

EXAMPLES

       Example 1 entries are:
	      color black  = #000000
	      color green  = #008000
	      color yellow = #ffff00
	      color blue   = #0000ff
	      color white  = #ffffff
	      color red    = #ff0000
	      color orange = #ffa500
	      color tan    = #D2B48C

	      user * = black white
	      role * = white black
	      type * = tan orange
	      range s0-s0:c0.c1023 = black green
	      range s1-s1:c0.c1023 = white green
	      range s3-s3:c0.c1023 = black tan
	      range s5-s5:c0.c1023 = white blue
	      range s7-s7:c0.c1023 = black red
	      range s9-s9:c0.c1023 = black orange
	      range s15:c0.c1023   = black yellow

       Example 2 entries are:
	      color black  = #000000
	      color green  = #008000
	      color yellow = #ffff00
	      color blue   = #0000ff
	      color white  = #ffffff
	      color red    = #ff0000
	      color orange = #ffa500
	      color tan    = #d2b48c

	      user unconfined_u = #ff0000 green
	      role unconfined_r = red #ffffff
	      type unconfined_t = red orange
	      user user_u	= black green
	      role user_r	= white black
	      type user_t	= tan red
	      user xguest_u	= black yellow
	      role xguest_r	= black red
	      type xguest_t	= black green
	      user sysadm_u	= white black
	      range s0:c0.c1023 = black white
	      user *		= black white
	      role *		= black white
	      type *		= black white

SEE ALSO

       mcstransd(8), selinux_raw_context_to_color(3), selinux_colors_path(3)

SELinux API documentation					   08 April 2011						   secolor.conf(8)
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