Bash script to search Jar files. Each archived file is searched for the specified string.

searchjars

#!/bin/bash
#Suggested file name: searchjars

if [[ $1 = "-h" || $1 = "--help" ]]
then
echo "Usage: $0 [STRING] [DIRECTORY]..."
echo "Search DIRECTORY(s) for Jar files. For each Jar, search the archived"
echo "files for STRING."
echo ""
echo "Default directory path is the current directory. Multiple directory "
echo "paths may be specified." 
echo ""
echo "Example:"
echo "  $0 ClassName /home/bsmith/java_project/lib"
exit 0
fi

args=("$@")
arg_count=${#args[@]}

if [ $arg_count -eq 0 ] ; then
  echo "Missing STRING argument."
  echo "Try \`$0 --help\` for more information."
  exit 2
fi

findString=$1
declare -a dirs

if [ $arg_count -lt 2 ] ; then
  dirs=( "`pwd`" )
else
  for (( i=1;i<arg_count;i++)) ; do
    dirs[$i - 1]=${args[${i}]} 
  done 
fi

echo "Searching file \"$1\" in directory(s): ${dirs[@]/%/$','}" | sed 's/,\s*$//'

#
# Search for jar files in specified directory. For each jar file, search the
# archived files for findString.
# 
# param $1 The directory to search.
#
function searchJarsInDir {
  local dir="$1"
  
  # See Stack Overflow question: http://stackoverflow.com/q/1116992/1164465 
  while IFS= read -r -d $'\0' file; do
    filename=`unzip -l "$file" | cut -d: -f2 | cut -d" " -f4 | grep -i $findString`
    if [ -n "$filename" ] ; then
      echo "Found in $file"
      for thefile in $filename; do
        echo "   –>" $thefile
      done
    fi
  done < <(find "$dir" -name "*.jar" -print0)
}

for dir in "${dirs[@]}" ; do
  searchJarsInDir "$dir"
done