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Full Discussion: Help needed - UNIX command
Homework and Emergencies Homework & Coursework Questions Help needed - UNIX command Post 303034367 by MadeInGermany on Wednesday 24th of April 2019 01:57:18 AM
Old 04-24-2019
In a regular expression (RE) the ^ means the beginning of the line; together with the = it enforces an exact match. Omit the ^ and it must only end with the given pattern.

$1 ~ /.*(NAME$|DIR$|PATH$)/ is correct, because the $1 field is = delimited, and in a RE the $ enforces the end of the field. The .* means any characters but is not needed here because any leading characters are always permitted in a RE (unless there is a ^ anchor). So it is optimized $1 ~ /NAME$|DIR$|PATH$/ or with a common $ anchor $1 ~ /(NAME|DIR|PATH)$/.
Last edited by MadeInGermany; 04-24-2019 at 03:03 AM..
This User Gave Thanks to MadeInGermany For This Post:
RavinderSingh13
 

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LEARN ABOUT DEBIAN

ndselect

NDSELECT(1)							   User Commands						       NDSELECT(1)

NAME

       ndselect - select lines and fields for numdiff

DESCRIPTION

       Usage: ndselect -h|--help|-v|--version	or

       ndselect [-b N][-e N][-s N][-F N][-L N][-I N][-S IFS][-x][-l PATH][-o PATH] [FILE]

       Print to standard output a subset of lines and fields from a given file.

       The  argument  after  the options is the name of the file to read from.	The complete path of the file should be given, a directory name is
       not accepted.  If no input file is specified, the program reads from the standard input.

       Exit status: 0 in case of normal termination, -1 (255) in case of error

       -b, --beginning, --start=N

	      Set to N the number of the first line to print (The default behavior is to start with line number 1)

       -e, --end=N

	      Set to N the number of the last line that can be printed (The default behavior is to arrive till to the end of the file)

       -s, --step=N

	      Set to N the increment to use when selecting the lines to print (The default value for the increment is 1)

       -F, --first-field=N

	      Set to N the number of the first field to print (The default behavior is to start with field number 1)

       -L, --last-field=N

	      Set to N the number of the last field that can be printed (The default behavior is to arrive till to the end of every line)

       -I, --increment=N

	      Set to N the increment to use when selecting the fields to print (The default value for the increment is 1)

       -S, --separator=IFS

	      Specify the set of characters to use to split the input lines into fields (The default set of characters is space, tab and newline).

       -x, --omit-empty-lines

	      Do not print empty lines

       -l, --warnings-to=PATH

	      Redirect warning and error messages from stderr to the indicated file

       -o, --output=PATH

	      Redirect output from stdout to the indicated file

       -h, --help

	      Show this help message

       -v, --version

	      Show version number, Copyright, Distribution Terms and NO-Warranty

COPYRIGHT

       Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012  Ivano Primi <ivprimi@libero.it>
       License GPLv3+: GNU GPL version 3 or later, see <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The full documentation for ndselect is maintained as a Texinfo manual.  If the info and ndselect programs are properly  installed  at  your
       site, the command

	      info numdiff

       should give you access to the complete manual.

ndselect 5.6.0							   January 2012 						       NDSELECT(1)
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