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Full Discussion: Shell Variables passed to awk to return certain rows
Top Forums Shell Programming and Scripting Shell Variables passed to awk to return certain rows Post 302948462 by Don Cragun on Monday 29th of June 2015 07:53:16 PM
Old 06-29-2015
You need a -v option for each variable you're setting; not just the first one.

If there is any chance that string_to_search could contain any whitespace characters or characters that have special meaning to the shell, it will also need to be quoted.

It is generally a good idea to quote all shell variable expansions, but I will assume for now that your script has already verified that $search_col_pos and $search_str_len expand to numeric strings.

And, inside an awk script, putting a variable name in quotes will try to match against the name of the variable instead of the contents of the variable.

Try:
Code:
awk -v search_col_pos=$search_col_pos -v search_str_len=$search_str_len -v string_to_search="$string_to_search" 'substr($0, search_col_pos, search_str_len) == string_to_search' test.txt

If that still doesn't work, show us what happens with the above corrections.
Last edited by Don Cragun; 06-29-2015 at 08:55 PM.. Reason: Fix typos.
This User Gave Thanks to Don Cragun For This Post:
pchang
 

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LEARN ABOUT DEBIAN

xtermcontrol

XTERMCONTROL(1) 						   User Commands						   XTERMCONTROL(1)

NAME

       xtermcontrol - dynamic control of XFree86 xterm properties.

SYNOPSIS

       xtermcontrol [OPTIONS]...

DESCRIPTION

       xtermcontrol  makes it easy to change colors, title, font and geometry of a running XFree86 xterm(1), as well as to report the current set-
       tings of the aforementioned properties.

       Window manipulations de-/iconify, raise/lower, maximize/restore and reset are also supported.

       To complete the feature set; xtermcontrol lets advanced users issue any xterm control sequence of their choosing.

OPTIONS

       --fg=COLOR
	      Set foreground color (see also COLOR NAMES).

       --bg=COLOR
	      Set background color.

       --colorN=COLOR
	      Set N'th [0-15] color.

       --highlight=COLOR
	      Set highlight color.

       --cursor=COLOR
	      Set cursor color.

       --mouse-fg=COLOR
	      Set mouse pointer foreground color.

       --mouse-bg=COLOR
	      Set mouse pointer background color.

       --font=FONT
	      Set font name (see also FONT NAMES). Alternatively it is possible to specify a fontmenu index as '#[0-6]' or navigate  the  fontmenu
	      by relative sizes as '#+N' or '#-N', where N is an optional integer.

       --title=STRING
	      Set window title. Note that mechanisms like the bash(1) PROMPT_COMMAND may overwrite the title.

       --geometry=WIDTHxHEIGHT+XOFF+YOFF
	      Set  size  and/or  position. Through its control sequences the xterm only recognize positive XOFF and YOFF offsets, which are pixels
	      relative to the upper left hand corner of the display. xtermcontrol is therefore unable to handle negative offsets as  described	in
	      the X(7x) GEOMETRY SPECIFICATIONS and therefore truncates negative values to zero.

       --get-fg
	      Report foreground color.

       --get-bg
	      Report background color.

       --get-colorN
	      Report N'th [0-15] color.

       --get-highlight
	      Report highlight color.

       --get-cursor
	      Report cursor color.

       --get-mouse-fg
	      Report mouse pointer foreground color.

       --get-mouse-bg
	      Report mouse pointer background color.

       --get-font
	      Report font.

       --get-title
	      Report window title.

       --get-geometry
	      Report size and position. The size of the text area is reported in characters and the position is reported in pixels relative to the
	      upper left hand corner of the display.

       --maximize
	      Maximize window.

       --restore
	      Restore maximized window.

       --iconify
	      Iconify window.

       --de-iconify
	      De-iconify window.

       --raise
	      Raise window.

       --lower
	      Lower window.

       --reset
	      Full reset.

       --raw=CTLSEQS
	      Issue raw control sequence (see also XTERM CONTROL SEQUENCES).

       --file=FILE
	      Force xtermcontrol to read configurations (see also CONFIGURATION) from FILE instead of the standard  personal  initialization  file
	      ~/.xtermcontrol.

       --force, -f
	      Skip TERM environment variable check.

       --verbose, -v
	      Print verbose reports.

       --help, -h
	      Print help message and exit.

       --version
	      Print the version number and exit.

CONFIGURATION

       xtermcontrol  reads  a default, ~/.xtermcontrol, or a user specified configuration file on startup.  Each line in the file is either a com-
       ment or contains an attribute.  Attributes consist of a keyword and an associated value:

	     keyword = value # comment

       The valid keyword/value combinations are:

	     foreground="COLOR"
	     background="COLOR"
	     highlight="COLOR"
	     cursor="COLOR"
	     mouse-foreground="COLOR"
	     mouse-background="COLOR"
	     geometry="WIDTHxHEIGHT+XOFF+YOFF"
	     font="FONT"
	     color0="COLOR"
	     color1="COLOR"
	     color2="COLOR"
	     color3="COLOR"
	     color4="COLOR"
	     color5="COLOR"
	     color6="COLOR"
	     color7="COLOR"
	     color8="COLOR"
	     color9="COLOR"
	     color10="COLOR"
	     color11="COLOR"
	     color12="COLOR"
	     color13="COLOR"
	     color14="COLOR"
	     color15="COLOR"

       Whitespace is ignored in attributes unless within a quoted value. The character '#' is taken to begin a comment. Each '#' and all remaining
       characters on that line is ignored.

FONT NAMES

       xtermcontrol  accepts any X(7x) FONT NAMES.  Font names like '-adobe-courier-medium-r-normal--10-100-75-75-m-60-iso8859-1' are very cumber-
       some to write, so it is convenient to make use of aliases, e.g.	'fixed' or '8x13', if present in fonts.alias files of  the  font  directo-
       ries.

COLOR NAMES

       xtermcontrol  accepts  any  X(7x)  COLOR  NAMES.   Basically  this  means  that	colors	are  specified	by name or rgb value, e.g. 'blue',
       'rgb:0000/0000/FFFF' or '#00F'. Colors are typically reported by the xterm in a device-dependent numerical form, e.g. 'rgb:0000/0000/FFFF'.
       Note that old syntax rgb values should always be quoted to avoid '#' being interpreted as the beginning of a comment by the shell (see also
       FILES).

XTERM CONTROL SEQUENCES

       The secret behind xtermcontrol is xterm control sequences. All the possible (there are a plethora of them) control sequences are documented
       in ctlseqs.txt, found in the xterm(1) distribution (see also FILES).

TROUBLESHOOTING

       If read/write permissions on the tty's are changed so that special group membership is required to be able to write to the pseudo terminal,
       the easiest workaround is to install xtermcontrol setuid root.

       Xterm(1) has three resources, allowWindowOps, allowTitleOps, and allowFontOps, that enables or disables special operations which  xtermcon-
       trol  relies on.  If any of these resources are set (or defaults) to 'false' xtermcontrol may hang.  The resources corresponds to xtermcon-
       trol options as:

	  allowWindowOps:
	     --raise
	     --lower
	     --restore
	     --maximize
	     --iconify
	     --de-iconify
	     --get-title
	     --geometry
	     --get-geometry

	  allowTitleOps:
	     --title

	  allowFontOps:
	     --font
	     --get-font

       All three resources can usually be enabled for the current xterm session via a menu; ctrl+rightclick and look  for  menu  item  names  like
       'Allow  Window  Ops'.  To  set these resource values persistently you can add the following to either your local ~/.Xdefaults file, or to a
       system-wide resource file like /etc/X11/app-defaults/XTerm:

	  *VT100.allowWindowOps: true
	  *VT100.allowTitleOps: true
	  *VT100.allowFontOps: true

FILES

       <XRoot>/X11/rgb.txt
	      Default rgb color name file location.

       ctlseqs.txt
	      Xterm control sequences documentation. Distributed with xterm from http://dickey.his.com/xterm/

SEE ALSO

       xterm(1), X(7x)

COPYRIGHT

       Copyright (C) 2002-2009 Jess Thrysoee <jess@thrysoee.dk>

xtermcontrol 2.10						 October 17, 2009						   XTERMCONTROL(1)
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