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Top Forums Shell Programming and Scripting Generating millions of record using shell script Post 302379569 by jaduks on Friday 11th of December 2009 05:44:38 AM
Old 12-11-2009
You can try something like this.

In this example, 2nd,3rd,5th fields are unique in each line.

Code:
for i in $(seq 10);
    do
        echo "a,2,c,d,5,6" | awk -v v=$i 'BEGIN {FS=OFS=","} {$2=v$2;$3=v$3;$5=v$5}{print}'
done

Output:
a,12,1c,d,15,6
a,22,2c,d,25,6
a,32,3c,d,35,6
a,42,4c,d,45,6
a,52,5c,d,55,6
a,62,6c,d,65,6
a,72,7c,d,75,6
a,82,8c,d,85,6
a,92,9c,d,95,6
a,102,10c,d,105,6

You can also use Bash "RANDOM" to make them very unique.
 

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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) BSD
September 27, 2014 BSD
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