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Full Discussion: awk - multiple and nested if-then-else
Top Forums Shell Programming and Scripting awk - multiple and nested if-then-else Post 303038702 by jcdole on Wednesday 11th of September 2019 06:21:13 PM
Old 09-11-2019
awk - multiple and nested if-then-else
Hello.


I would like to convert the following piece of code from bash to awk.

Here are bash variables in a bash script.

CUR_ROW_ID and ROW_ID_TO_SEARCH contains a string which represent a row id.

The string contain a valid row id.
  • CUR_ROW_ID sometimes may be null.
  • CUR_VALUE contains a string which represent the value of the relative CUR_ROW_ID.
  • CUR_VALUE sometimes may be null.
  • DO_IT is a flag to control the rest of the process.

Three variables a read from bash env to awk env : CUR_ROW_ID and ROW_ID_TO_SEARCH and CUR_VALUE
One variable is write from awk env to bash env.


Don't look for a meaning in this piece of code. It's just a question about nested if-then-else


ROW_ID_TO_SEARCH contains a string to search in the input file
If there is a match CUR_ROW_ID = ROW_ID_TO_SEARCH
If ROW_ID_TO_SEARCH is not in the input file CUR_ROW_ID is null.
I got this in bash with something like :
Code:
    L_FLAG=$( cat $L_INPUT_FILE | grep -w "$ROW_ID_TO_SEARCH" )
    if [[ -z $L_FLAG ]] ; then
        echo "ROW : $ROW_ID_TO_SEARCH not in use"
    else
        .................
        .................
        .................
    fi

So my question is : how to convert the following in awk :

Code:
    if [[  -z "$CUR_ROW_ID" ]] ; then

        printf "NEW ROW to insert" 

        DO_IT=1

    else

        if [[  "$CUR_ROW_ID" == "$ROW_ID_TO_SEARCH" ]] ; then 

                if [[ -z "$CUR_VALUE" ]] ; then
 
                    printf "NEW VALUE TO CREATE for ROW : %s\n" "$CUR_ROW_ID"
                    DO_IT=2 

            else 

                printf "CURRENT VALUE : %s TO UPDATE for ROW : %s\n" "$CUR_VALUE" "$CUR_ROW_ID"
                DO_IT=3 

            fi 

        fi 

    fi

AWK part

To convert
Code:
if [[  -z "$CUR_ROW_ID" ]] ; then

I have tried this which does not work ( print all the line ) :
Code:
awk -v a="$ROW_ID_TO_SEARCH" '{ if ($0 !~ a) {  printf ("NOT FOUND --> ROW_ID:%s\n",a)  }} '  $L_INPUT_FILE

For nested if-the-else I have tried this which should not print nothing because "ROW_ID_TO_SEARCH" (FORCE_IGNORE9) is not in the input file

Code:
awk -v a="$ROW_ID_TO_SEARCH" '{  if($1 == a)
    { if ($2 == "" ) printf ("ID_NULL --> ROW_ID:%s\tVALUE:%s\n",$1,$2) }
      else if ($2 != "" ) {  printf ("ID_NOLT_NULL --> ROW_ID:%s\tVALUE:%s\n",$1,$2) } ;
    }'  $L_INPUT_FILE

The result is :

Code:
ID_NOLT_NULL --> ROW_ID:#FORCE_IGNORE2 VALUE:1
ID_NOLT_NULL --> ROW_ID:FORCE_IGNORE4_1 VALUE:2
ID_NOLT_NULL --> ROW_ID:FORCE_IGNORE4_3 VALUE:3
ID_NOLT_NULL --> ROW_ID:FORCE_IGNORE4_5 VALUE:4

Test with :

Code:
ROW_ID_TO_SEARCH=FORCE_IGNORE9

the input file contains :

Code:
FORCE_IGNORE1
#FORCE_IGNORE2    1
FORCE_IGNORE3
FORCE_IGNORE4_1    2
FORCE_IGNORE4_2
FORCE_IGNORE4_3    3
FORCE_IGNORE4_4
FORCE_IGNORE4_5    4
FORCE_IGNORE4_6


Any help is welcome.
 

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