...yet another string of awk/sed questions from a RegExp-Challenged luser %-\


 
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Top Forums Shell Programming and Scripting ...yet another string of awk/sed questions from a RegExp-Challenged luser %-\
# 15  
Old 10-03-2009
Actually, the code could be simplified and cleaned up a little. Also the first '{' was in the wrong place and should be in front of the while loop. For ksh this does not matter, but is does for other shells..

Code:
#!/bin/ksh
# check
if [ -z "$1" ]; then
  echo "Usage: ${0##*/} inputfile"; exit 1
fi

# First Step 2
sed 's/^\([CDS]\) \(.*\)$/\2 \1/' "$1" |\
{ while read line; do
    case $line in
        # Step 3
        \[*) prevline="$prevline $line";;
        # Step 4
        *)   echo $prevline
        # Step 1
             case $line in
               *subnets*|*masks*) echo ;;
             esac
             prevline=$line  ;;
    esac;
  done;
  echo $prevline
} | \
{ while read firstline; do  # Step 5
    while read line; do
      if [ -n "$firstline" ]; then
        echo $firstline
        firstline=""
      fi
      if [ -n "$line" ]; then
        echo $line
      else
        break
      fi
    done|sort -n -t. -k1,1 -k2,2 -k3,3 -k4,4
    echo
  done
  if [ -n "$firstline" ]; then
    echo $firstline
  fi
}

If you replace the sed string with your own, you can either leave out:
Code:
;/masks/s/^/\n/; /subnets/s/^/\n/

or remove:
Code:
             case $line in
               *subnets*|*masks*) echo ;;
             esac

since one of them is superfluous.

The script should work with bash or posix shell as well.

Last edited by Scrutinizer; 10-03-2009 at 10:37 AM..
# 16  
Old 10-03-2009
without the 'sorting' requirement 5:
nawk -f steve.awk myFile

steve.awk:
Code:
/(masks|subnets)/ { $0=ORS $0 }
$1 ~ /^[CDS]$/ { $0=$0 OFS $1;$1=""}
{sub("^ *", "");}
/^[[]/{ line = line OFS $0; next}
{if (length(line)) print line; line=$0}
END {print line}

# 17  
Old 10-04-2009
One more addition. It is of course better to use functions instead of the mad pipe spaghetti..Smilie
Code:
#!/bin/sh
# check
if [ -z "$1" ]; then
  echo "Usage: ${0##*/} inputfile"; exit 1
fi

process_lines() {
  while read line; do
    case $line in
        \[*) prevline="$prevline $line";;   # Step 3
        *)   echo $prevline                 # Step 4
             case $line in                  # Step 1
               *subnets*|*masks*) echo ;;
             esac
             prevline=$line  ;;
    esac;
  done;
  echo $prevline
}

paragraphsort() {
  while read firstline; do                  # Step 5
    while read line; do
      if [ -n "$firstline" ]; then
        echo $firstline
        firstline=""
      fi
      if [ -n "$line" ]; then
        echo $line
      else
        break
      fi
    done|sort -n -t. -k1,1 -k2,2 -k3,3 -k4,4
    echo
  done
  if [ -n "$firstline" ]; then
    echo $firstline
  fi
}

# Step 2
sed 's/^\([CDS]\) \(.*\)$/\2 \1/' "$1" |process_lines|paragraphsort

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