UNIX Script for a list of strings find those not in any file

I'm parsing a properties file to get a list of properties defiend. I want to check all the places these properties are used (target d开发者_开发知识库ir and subdirs), flagging up any that are defined in the properties file but not used anywhere in the targer dir. Thus far I have

FILE=$1
TARGETROOT=$2

for LINE in `grep '[A-Z]*=' $FILE | awk -F '=' '{print$1}'`;
do

done;

Inside this loop I want to find those $LINE vars which are not in $TARGETROOT or its subdirs

Example files

Properties File
a=1
b=2
c=3
...

Many files that contain references to properties via

FILE 1
PropAValue = a

check the return code of grep.

You can do this by inspecting the $? variable.

if it is 0 then the string was found, otherwise the string was not found. If not 0 then add that string to a 'not found' array and that should be your list of not found properties.

grep "string" 
if [$? -ne 0] 
then 
   string not found 
fi

• Using xyz | while read PROP instead of for PROP in ``xyz``; do for those cases when xyz can get arbitrarily large

• Using grep -l ... >/dev/null || xyz to execute xyz if grep fails to match, and discard the grep output do /dev/null without executing xyz if one match is found (-l stops grep after the first match, if any, making it more efficient)

  FILE=$1 
  TARGETROOT=$2
  
  grep '^[A-Z]*=' "$FILE2" | awk -F= '{print$1}' | while read PROP ; do
    find "$TARGETROOT" -type f | while read FILE2 ; do
      grep -l "^${PROP}=" "$FILE2" >/dev/null || {
        echo "Propery $PROP missing from $FILE2"
      }
    done
  done
  

If dealing with a large number of properties and/or files under $TARGETROOT you can use the following, more efficient approach (which opens and scans each file only once instead of the previous solution's N times, where N was the number of properties in $FILE):

• Using a temporary file with all sorted properties from $FILE to avoid duplicating work
• Using awk ... | sort -u to isolate all sorted properties appearing in another file $FILE2

• Using comm -23 "$PROPSFILE" - to isolate those lines (properties) which only appear in $PROPSFILE and not on the standard input (i.e. in $FILE2)

  FILE=$1 
  TARGETROOT=$2
  
  PROPSFILE="/tmp/~props.$$"
  grep '^[A-Z]*=' "$FILE" | awk -F= '{print$1}' | sort -u >"$PROPSFILE"
  
  find "$TARGETROOT" -type f | while read FILE2 ; do
    grep '^[A-Z]*=' "$FILE2" | awk -F= '{print$1}' | sort -u |
    comm -23 "$PROPSFILE" - | while read PROP ; do
      echo "Propery $PROP missing from $FILE2"
    done
  done
  
  rm -f "$PROPSFILE"