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Full Discussion: awk call in bash function called with arugments not working, something lost in translation?
Top Forums Shell Programming and Scripting awk call in bash function called with arugments not working, something lost in translation? Post 303043600 by LMHmedchem on Saturday 1st of February 2020 01:56:58 PM
Old 02-01-2020
Quote:
Originally Posted by vgersh99
I see a couple of potential issue with this approach.
I still don't understand why you can't use the usual paradigm of passing vars with -v to awk and have to use this somewhat convoluted approach.
Any chance you can attach a sample file?
I will put together a sample directory and post it.

The -v method works for the comments and replace line, no matter if there are special characters or spaces. It is the $look_for line that is the problem. This version of the code does not work. The $look_for line is never found.
Code:
#! /bin/bash

# value determined elsewhere
total_outputs_p1=100
# file being modified
filename='./common_depend/UTILPARAMS.DAT'
# comment lines to ignore
comment_ch="C"
# line being searched for to replace
look_for="      PARAMETER \(SIZEXX = "
# value of replacement line
replace_with="      PARAMETER (SIZEXX = $total_outputs_p1)"

# process file with awk to find $look_for and replace with $replace_with
awk -v comment="$comment_ch" \
    -v find_line="$look_for" \
    -v replace_line="$replace_with" \
' { if( substr($0,1,1) == comment || if( substr($0,1,2) == comment )
       print $0;
    else if($0 ~ find_line)
       print replace_line;
    else
       print $0;
  } ' $filename > tmp
# overwrite original file
mv tmp $filename

If you replace,

else if($0 ~ find_line)

with,

else if($0 ~ / PARAMETER \(SIZEXX = /)

then it will function. This is hard coding specifically for each item to find and so can't be used in a function. I read that the -v option presented difficulties when using characters that need to be escaped and that is when I switched to the temporary environment variables that I read about on a stackexchange post (I think). I don't understand why it works, but not in the function.

I will post some samples in a few minutes. I need another cup of coffee.

LMHmedchem
 

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LEARN ABOUT DEBIAN

colorgccrc

COLORGCCRC(5)							File Formats Manual						     COLORGCCRC(5)

NAME

       colorgccrc - configuration file for colorgcc

DESCRIPTION

       A colorgccrc configuration file is used to configure the highlighting of the compiler output from colorgcc.

SYNTAX

       Each  line  consists  of  a  keyword  designating  a configuration variable.  The keyword is followed by `:' and then one or several values
       (depending on the keyword).  Lines beginning with a hash mark `#' are comments.

CONFIGURATION VARIABLES

       g++ | gcc | c++ | cc | g77 | gcj | gnat | gpc
	      Specifies the paths to the compilers.  Takes one value; a path to the compiler.

       nocolor
	      Specifies what terminal types colorization should be disabled on.  Takes one or several values, separated by whitespace.

       srcColor
	      Specifies the highlighting attributes source-code should be given.  Takes one or several color attributes.  See  the  section  COLOR
	      ATTRIBUTES for more information.

       introColor
	      Specifies  the  highlighting  attributes	for normal compiler output.  Takes one or several color attributes.  See the section COLOR
	      ATTRIBUTES for more information.

       warningFileNameColor | errorFileNameColor
	      Specifies the highlighting attributes for the filename in a  warning  or	an  error,  respectively.   Takes  one	or  several  color
	      attributes.  See the section COLOR ATTRIBUTES for more information.

       warningNumberColor | errorNumberColor
	      Specifies  the  highlighting  attributes	for  the  line-number  in a warning or an error, respectively.	Takes one or several color
	      attributes.  See the section COLOR ATTRIBUTES for more information.

       warningMessageColor | errorMessageColor
	      Specifies the highlighting attributes for the message-text in a warning or an error,  respectively.   Takes  one	or  several  color
	      attributes.  See the section COLOR ATTRIBUTES for more information.

COLOR ATTRIBUTES

       The following attributes are valid for highlighting.

       clear, reset

       bold, underline, underscore, blink, reverse, concealed

       black, red, green, yellow, blue, magenta, cyan, white

       on_black, on_red, on_green, on_yellow, on_blue, on_magenta, on_cyan, on_white

SEE ALSO

       gcc(1), colorgcc(1)

HISTORY

       Jan 15 2003: Initial version of this manual-page.

REPORTING BUGS

       Report bugs to <jmoyers@geeks.com>

AUTHORS

       Jamie Moyers <jmoyers@geeks.com> is the author of colorgcc.

       This  manual  page  was	written  by Joe Wreschnig <piman@sacredchao.net>, and modified by David Weinehall <tao@debian.org>, for the Debian
       GNU/Linux system (but may be used by others).

COPYRIGHT

       Copyright (C) 2003 Jamie Moyers
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

								   Jan 15, 2003 						     COLORGCCRC(5)
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