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Top Forums UNIX for Beginners Questions & Answers Discarding records with duplicate fields Post 303043656 by RavinderSingh13 on Monday 3rd of February 2020 06:39:14 AM
Old 02-03-2020
Quote:
Originally Posted by beca123456
Your code works. Thanks !
But I would like to understand why mine does not. It seems fine to me...
Hello becal123456,

IMHO problem in your code is that you haven't done any increment on very first occurrence of a[$2 FS $4 FS $5 FS $6 FS $7] and when it goes into condition check happens first and increment for that line's field happens later hence false positive results are coming, so if you change your code to following:

Code:
awk '
BEGIN{FS=OFS="\t"}
{
    a[$2 FS $4 FS $5 FS $6 FS $7]++
    if($1 ~ /grp2/){
        if(a[$2 FS $4 FS $5 FS $6 FS $7]==1){
            print $0
         }
    }
    else{
        print $0
    }
}'   Input_file

Then we are doing increment in array a[$2 FS $4 FS $5 FS $6 FS $7]++ so when it goes to next time in grep2 condition it has those values also which are common in grep1 line(which were getting missed since we haven't put increment in its previous statement).

I hope we should be good here, please feel free to shoot any further queries on same.

NOTE: To say anyone "Thanks" on UNIX.com you can hit THANKS button; present at every post's left corner Smilie

Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
 

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nice(1) 							   User Commands							   nice(1)

NAME
nice - invoke a command with an altered scheduling priority SYNOPSIS
/usr/bin/nice [-increment | -n increment] command [argument]... /usr/xpg4/bin/nice [-increment | -n increment] command [argument]... csh Builtin nice [-increment | +increment] [command] DESCRIPTION
The nice utility invokes command, requesting that it be run with a different system scheduling priority. The priocntl(1) command is a more general interface to scheduler functions. The invoking process (generally the user's shell) must be in a scheduling class that supports nice. If the C shell (see csh(1)) is used, the full path of the command must be specified. Otherwise, the csh built-in version of nice will be invoked. See csh Builtin below. /usr/bin/nice If nice executes commands with arguments, it uses the default shell /usr/bin/sh (see sh(1)). /usr/xpg4/bin/nice If nice executes commands with arguments, it uses /usr/xpg4/bin/sh (see ksh(1)). csh Builtin nice is also a csh built-in command with behavior different from the utility versions. See csh(1) for description. OPTIONS
The following options are supported: -increment | -n increment increment is a positive or negative decimal integer that has the same effect on the execution of the utility as if the utility had called the nice() function with the numeric value of the increment option-argument. See nice(2). nice() errors, other than EINVAL, are ignored. If not specified, an increment of 10 is assumed. The super-user may run commands with priority higher than normal by using a negative increment such as -10. A negative increment assigned by an unprivileged user is ignored. OPERANDS
The following operands are supported: command The name of a command that is to be invoked. If command names any of the special built-in utilities (see shell_builtins(1)), the results are undefined. argument Any string to be supplied as an argument when invoking command. ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of nice: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, PATH, and NLSPATH. EXIT STATUS
If command is invoked, the exit status of nice will be the exit status of command. Otherwise, nice will exit with one of the following val- ues: 1-125 An error occurred. 126 command was found but could not be invoked. 127 command could not be found. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: /usr/bin/nice +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ /usr/xpg4/bin/nice +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWxcu4 | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), ksh(1), nohup(1), priocntl(1), sh(1), shell_builtins(1), nice(2), attributes(5), environ(5), standards(5) SunOS 5.11 23 Jan 2004 nice(1)
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