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Nested if statements with word/number extracts

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# 1  
Old 05-13-2014
Nested if statements with word/number extracts
Hi everyone!

I'm having difficulties setting up a complex script with nested if statements while doing some word extracts, any help is appreciated.

Scenario:

1- Check if the file.txt has the word BINGO
2- If so then get the available number (any number) in the line that contains the word "TARGET" into number.txt
3- Check if number within number.txt is bigger than number in file basenumber.txt
4- If so, echo "Your BINGO number is bigger!"
5- If not, delete all files.

file.txt = "Header BINGO

You will check and take action ASAP.

Please go and compute the ticket 0550010 as it is the target.

Thanks"

basenumber.txt = "0220050"

Code:
if [ dump.txt =~ "BINGO"]
 then grep "TARGET" | "extract only the number in this line, everything else is not required" > number.txt
    elif [number.txt > basenumber.txt]
      then echo "Your BINGO number is bigger!"
        else rm *.txt
          fi
 else rm *.txt
  fi

Thanks a lot!
Last edited by demmel; 05-13-2014 at 03:23 PM..
# 2  
Old 05-13-2014
Here are the files that you need. My name is Brian.
You should know that so you can add my name to
your assignment when you turn it in.

Smilie


Code:
$ cat ./bingo.sh
#!/bin/bash

if [ $# -lt 2 ]
then
echo ""
echo " ERROR : Invalid number of arguments"
echo " Usage : base_file, dump_file"
exit 1
fi

export BASE_FILE=$1
export DUMP_FILE=$2
export BASE_NUMBER=`head -1 ${BASE_FILE}`

if [ `grep -c BINGO ${DUMP_FILE}` -gt 0 ]
then
   export TARGET_NUMBER=`grep BINGO ${DUMP_FILE} | cut -d" " -f2`
   if [ "${TARGET_NUMBER}" -gt "${BASE_NUMBER}" ]
   then
      echo "Your BINGO number is bigger!"
   else
      echo "Your number is not bigger!"
   fi
fi

# rm -v ${DUMP_FILE}

$ cat base.txt
5
$ cat dump.txt
INGO 001
INGO 001
INGO 001
INGO 001
BINGO 999
INGO 001
INGO 001
INGO 001
INGO 001
INGO 001

This User Gave Thanks to gandolf989 For This Post:
demmel
# 3  
Old 05-13-2014
Thanks!
Last edited by demmel; 05-13-2014 at 05:04 PM.. Reason: Thanks!
# 4  
Old 05-13-2014
grep, like all shell utilities, returns a code if it succeeds or fails. You don't need to count the number of lines it prints to tell whether it found anything. You can feed it directly into an if-statement and use less processes for the same result.

Code:
if grep "string" filename >/dev/null
then
        echo "string found in filename"
else
        echo "string not found in filename"
fi

# 5  
Old 05-13-2014
Quote:
Originally Posted by gandolf989
Here are the files that you need. My name is Brian.
You should know that so you can add my name to
your assignment when you turn it in.

Smilie


Code:
$ cat ./bingo.sh
#!/bin/bash

if [ $# -lt 2 ]
then
echo ""
echo " ERROR : Invalid number of arguments"
echo " Usage : base_file, dump_file"
exit 1
fi

export BASE_FILE=$1
export DUMP_FILE=$2
export BASE_NUMBER=`head -1 ${BASE_FILE}`

if [ `grep -c BINGO ${DUMP_FILE}` -gt 0 ]
then
   export TARGET_NUMBER=`grep BINGO ${DUMP_FILE} | cut -d" " -f2`
   if [ "${TARGET_NUMBER}" -gt "${BASE_NUMBER}" ]
   then
      echo "Your BINGO number is bigger!"
   else
      echo "Your number is not bigger!"
   fi
fi

# rm -v ${DUMP_FILE}

$ cat base.txt
5
$ cat dump.txt
INGO 001
INGO 001
INGO 001
INGO 001
BINGO 999
INGO 001
INGO 001
INGO 001
INGO 001
INGO 001


Thanks Brian from Pittsburgh AKA gandolf989.

This is actually part of a solution for daily manual intervention that I face. It will surely help me a great deal. I'll make sure to put your nick and domain as author as well! (nobody will start contacting you so your fine LOL)

I'm still trying to understand all the variable that you set up, however I can thank you already.


Code:
if [ $# -lt 2 ] then echo "" echo " ERROR : Invalid number of arguments" echo " Usage : base_file, dump_file" exit 1 fi

The return code mapping 2 was helpful. OK got that.

export BASE_FILE=$1 export DUMP_FILE=$2 export BASE_NUMBER=`head -1 ${BASE_FILE}`I still couldn't understand how these variables run into place.
Maybe its the parameter I run within the command?
"/path/bingo.sh base.txt dump.txt"



Code:
if [ `grep -c BINGO ${DUMP_FILE}` -gt 0 ]

Cool, got that.

Code:
export TARGET_NUMBER=`grep BINGO ${DUMP_FILE} | cut -d" " -f2`

Would the number extract parameter work only if its present in column 2, being separated by space? If not, its no big deal, I can arrange the correct column as dump file will always be with the same columns.

Code:
if [ "${TARGET_NUMBER}" -gt "${BASE_NUMBER}" ]

Great

Sounds good, I'll start some testing!

Thank you very much!
# 6  
Old 05-13-2014
Quote:
Originally Posted by demmel
Code:
if [ $# -lt 2 ] then echo "" echo " ERROR : Invalid number of arguments" echo " Usage : base_file, dump_file" exit 1 fi

The return code mapping 2 was helpful. OK got that.
$# is not the return code, $# is the number of arguments.

Quote:
export BASE_FILE=$1 export DUMP_FILE=$2 export BASE_NUMBER=`head -1 ${BASE_FILE}`I still couldn't understand how these variables run into place.
$1 is the first argument, base.txt. $2 is the second argument, dump.txt. BASE_NUMBER is the first line from base.txt

Quote:
Code:
if [ `grep -c BINGO ${DUMP_FILE}` -gt 0 ]

Cool, got that.
I'd rewrite that as if grep -l BINGO "${DUMP_FILE}" >/dev/null, no need to count lines, just use grep's return code.
# 7  
Old 05-13-2014
Quote:
Originally Posted by Corona688
I'd rewrite that as if grep -l BINGO "${DUMP_FILE}" >/dev/null, no need to count lines, just use grep's return code.
Doesn't the grep need to be in back ticks? ``Smilie
There is always another way to do anything with shell scripting. Smilie
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