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Full Discussion: Trouble using awk command
Top Forums Shell Programming and Scripting Trouble using awk command Post 302929531 by Ravindra Swan on Monday 22nd of December 2014 12:43:36 PM
Old 12-22-2014
Trouble using awk command
Hi,

I have 2 .txt pads containing data.
I need a script which reads content of one .txt file, performs some operations and calculates a number which is stored in a variable.
Now , all the content of another .txt pad should be appended to first .txt pad at pre calculated nth line number.

Below is sample data and commands i tried
Code:
> cat temp.dml
record
  decimal("\x01") lst_updt_run_id; /* INTEGER NOT NULL*/
decimal("\x01") invalid_data;
end;
 
cat > t.txt
this is the first line
[[this is second line]]
. h.ksh
 
expected O/P: If want to append at 1st line
 
this is the first line
[[this is second line]]
. h.ksh
record
  decimal("\x01") lst_updt_run_id; /* INTEGER NOT NULL*/
decimal("\x01") invalid_data;
end;
 
tried code:
> awk 'NR==1{file="t.txt";while ((getline<file) > 0) {print}}1' temp.dml | uniq
this is the first line
[[this is second line]]
. h.ksh
  decimal("\x01") lst_updt_run_id; /* INTEGER NOT NULL*/
decimal("\x01") invalid_data;
end;

there were couple of issues faced:
1. I tried matching NR with a variable which contains the line position to append but it was not working.
2.Last row of second .txt pad is repeating and hence i used uniq keyword.

Any solutions to this?
 

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LEARN ABOUT FREEBSD

atf-sh

ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME

     atf-sh [-s shell] -- interpreter for shell-based test programs

SYNOPSIS

     atf-sh script

DESCRIPTION

     atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library.

     atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL.  atf-sh executes the inter-
     preter, loads the atf-sh(3) library and then runs the script.  You must consider atf-sh to be a POSIX shell by default and thus should not
     use any non-standard extensions.

     The following options are available:

     -s shell	  Specifies the shell to use instead of the value provided by ATF_SHELL.

ENVIRONMENT

     ATF_LIBEXECDIR    Overrides the builtin directory where atf-sh is located.  Should not be overridden other than for testing purposes.
     ATF_PKGDATADIR    Overrides the builtin directory where libatf-sh.subr is located.  Should not be overridden other than for testing purposes.
     ATF_SHELL	       Path to the system shell to be used in the generated scripts.  Scripts must not rely on this variable being set to select a
		       specific interpreter.

EXAMPLES

     Scripts using atf-sh(3) should start with:

	   #! /usr/bin/env atf-sh

     Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh.  Instead, you have to hardcode
     the path to atf-sh in the script and then use the -s option afterwards as a single parameter:

	   #! /path/to/bin/atf-sh -s/bin/bash

ENVIRONMENT

     ATF_SHELL	  Path to the system shell to be used in the generated scripts.

SEE ALSO

     atf-sh(3)

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								September 27, 2014							       BSD
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