how to pass arguments 1

[daula]

hi everyone;
i have a script that is supposed to take an inputfile arg and an optional outputfile.
what i'd like to happen is:
1. quit if no arg passed
2. please, see the psudo code;

if (arg 1 exists and is a valid file)
{     
   if(arg 2 exist)
      then process inputfile and save result to outputfile.
   otherwise
      process inputfile and spit the result onto the screen. 
}
otherwise 
{
   quit
}

i'm seeking some help with number 2 above.

thanks in advance

daula

 

[feherke]

Hi

Like this ? But would be better to tell us more about what you want exactly.

awk -v myarg=myfilename '
BEGIN{
  if (myarg=="") exit;
  if ((getline < myarg)==-1) exit;
  close(myarg)
}
' /input/file

Feherke.

http://rootshell.be/~feherke/

 

[daula]

actually my script is for transforming an xml file and as you can see on the usage, the script is supposed to take an xml file and an optional output file.
currently, both args are reguired coz i'm feeding 'em at the end of the awk block as you may notice on the code bellow.

i would like the capability to be able to either run the script in two different ways:
(1) pass two args thus, saving result to output file
./tally.sh tally.xml output_file
(2) pass one arg... display result to screen
./tally.sh tally.xml

so, is it possible to incorporate my bash portion of the script to achieve the above. or, is there an awk way to do this??

Thanks in advance.

daula

##! /bin/bash

### Script Name: tally.sh
### Usage:     ./tally.sh tally.xml [output_file]

TALLY="$1"
OUT_FILE=""
E_BADARGS=65

if [[ -z "$TALLY" ]]; then   # blank
   echo "Usage: ./`basename $0` tally.xml [output_file]"
   exit $E_BADARGS
else
  if [[ -e "$TALLY" ]]; then # tally.xml file exist
     if [[ -z "$2" ]]; then
        echo "Usage: ./`basename $0` $TALLY"
     else
        OUT_FILE="$2"
        echo "Usage: ./`basename $0` $TALLY $OUT_FILE"
     fi
  fi
fi

awk '
BEGIN{FS=" *<[^>]+>";f="%s,%d,%04.2f,%d,%04.2f,%d,%04.2f,%d,%04.2f,%d,%04.2f\n"}
/:name="cSCF">/{++r;next}
/>00-06/{c=2;next}
/>07-12/{c=4;next}
/>13-24/{c=6;next}
/>25-36/{c=8;next}
/>37-48/{c=10;next}
/:value>/{a[r,1]=$2;c=0;next}
/:count>/{a[r,c]=$2;t[c]+=$2}
END{
  t[4]+=t[2];t[6]+=t[4];t[8]+=t[6];t[10]+=t[8]
  for(i=1;i<=r;++i){
    a[i,4]+=a[i,2];a[i,6]+=a[i,4];a[i,8]+=a[i,6];a[i,10]+=a[i,8]
    printf f,a[i,1],0+a[i,2],100*a[i,2]/t[2],a[i,4],100*a[i,4]/t[4],a[i,6],100*a[i,6]/t[6],a[i,8],100*a[i,8]/t[8],a[i,10],100*a[i,10]/t[10]
  }
  printf "%d,%d,%d,%d,%d\n",t[2],t[4],t[6],t[8],t[10]
}
' "$TALLY" > "$OUT_FILE"

 

[Annihilannic]

Something like this perhaps?

if [[ -z "$TALLY" ]]; then   # blank
   echo "Usage: ./`basename $0` tally.xml [output_file]"
   exit $E_BADARGS
else
  if [[ -e "$TALLY" ]]; then # tally.xml file exist
     if [[ -z "$2" ]]; then
        OUT_FILE=/dev/stdout
     else
        OUT_FILE="$2"
     fi
  fi
fi

Annihilannic.

 

[Annihilannic]

You could also use this more concise syntax:

if [[ -z "$TALLY" ]]; then   # blank
   echo "Usage: ./`basename $0` tally.xml [output_file]"
   exit $E_BADARGS
else
  if [[ -e "$TALLY" ]]; then # tally.xml file exist
     OUT_FILE="${2:-/dev/stdout}"
  fi
fi

It sets OUT_FILE to "/dev/stdout" if the value of $2 is undefined.

Annihilannic.

 

[daula]

that's exactly what i neeeded.
thanks Annihilannic

daula