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If and else using awk

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# 1  
Old 09-26-2012
If and else using awk
Hi

I want to apply some logic to below (FROM) output and get it to the desired output

FROM
cat jk3:

HTML Code:
APP1			APP1			
10 1366222                         | 10 1366229
13 12559230                        | 13 12559239
APP2					APP2	
APP3					APP3	
10 1366222                         | 10 1366229
13 12559230                        |  13 12559239
APP4					APP4
DESIRED output:

HTML Code:
APP1
---------------
ID        Gaps       Time of gap
[10]           [1366222 =>1366229]       08:00 - 08:30
[13]           [12559230=>255923]        08:00 - 08:30

APP2
---------------
ID        Gaps      Time of gap

APP3
---------------
ID        Gaps       Time of gap
[10]           [1366222 =>1366229]       08:00 - 08:30
[13]           [12559230=>255923]        08:00 - 08:30

APP4
---------------
ID        Gaps      Time of gap

The logic is, if the line contains APP word, just print the whole line. If not, print first column inside [], print 2nd column then have a '=>' seperator and then print fifth column. Then we want to print two variables which show start and end time.

I can do half of what I need using awk, however im unable to output the start time and end time variables using awk


Code:
awk '{ if ($1 ~ /APP/) print $1; else print "["$1"] \t\["$2"=>"$5"] "}' jk3

APP1
[10]    [1366222=>1366229]
[13]    [12559230=>12559239]
APP2
APP3
APP4
[10]    [1366222=>1366229]
[13]    [12559230=>12559239]


Ie This is what I want to do but seems I cant do using awk (ie adding two variables $PREVIOUS_CHECK_DATE$CURRENT_CHECK_DATE to end of the line if it doesn't contain APP)

I get below errors when trying this method
Code:
 awk '{ if ($1 ~ /APP/) print $1; else print "["$1"] \t\["$2"=>"$5"] \t\"$PREVIOUS_CHECK_DATE$CURRENT_CHECK_DATE }' jk3

awk: { if ($1 ~ /APP/) print $1; else print "["$1"] \t\["$2"=>"$5"] \t\"$PREVIOUS_CHECK_DATE$CURRENT_CHECK_DATE }
awk:                                                             ^ unterminated string


Have also tried to do following but not getting what I need. Can anyone see what im doing wrong or what is the best method. Many Thanks

Code:
while read line
do
grep APP $line > /dev/null
RET_CODE=$?

if [ $RET_CODE -eq 0 ]
then
echo $line
else
echo "$line $PREVIOUS_CHECK_DATE $CURRENT_CHECK_DATE"
fi
done < jk3

# 2  
Old 09-26-2012
you cannot use shell variable as is inside awk..you got to use the "-v" option to fetch the shell variables into awk..

eg not tested code:
Code:
awk -v previousDt="$PREVIOUS_CHECK_DATE" currentDt="$CURRENT_CHECK_DATE" 
 ' /APP/{ print $1;next;} {print "["$1"] \t["$2"=>"$5"] \t"previousDt" - "currentDt }' jk3

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