Search and display list of local files by keywords

search.sh

#!/usr/bin/env bash

# Setup colors
NONE='\033[00m'
GREEN='\033[00;32m'
YELLOW='\033[00;33m'

# Example usage
if (($# == 0)); then
	echo "Usage: ./search.sh keyword1 [keyword] ..."
	exit
fi

echo -e Searching ${YELLOW} "$@" ${NONE}

if (($# == 1)); then
  # Search using ack
  # pass in all args to ack, and list only files
  FILES=`ack -l $@`
else
  # Build a multiword ack search that should result
  # in CMD equaling someting like
  #   grep -f <(ack -l foo) <(ack -l bar)
  CMD="grep -f"
  for var in "$@"; do
    CMD="$CMD <(ack -l $var)"
  done

  # debug CMD variable
  #  echo "$CMD"
  #  echo ".."

  # Things I tried to get eval saved into variable FILES
  #  FILES=`grep -f "$ACKS"`
  #  FILES=`grep -f '$ACKS'`
  #  FILES=`"$CMD"`
  #  FILES=$($CMD)
  #  FILES=$("$CMD")
  #  FILES=($("$CMD"))
  #  FILES=$((CMD))
  #  FILES=${$CMD}
  #  eval "FILES=\$(( $ACKS ))"
  #  eval \${$CMD}
  #  FILES= eval "$CMD"
  #  eval "FILES=$CMD"
  #  FILES= $("$CMD")
  #  F="FILES"
  #  eval $F="$CMD
  #  echo `"$CMD"`

  eval "$CMD"
  exit # Exit because eval will output file list
       # Avoid exit after figuring out how to save result
       # of eval to variable FILES
fi

for f in $FILES
do
  FILENAME=${GREEN}$f${NONE}          # output filename in green
  FILE_SUMMARY=`sed -n '3,3p' $f`     # output only line 3, assumed to be summary line of file
  echo -e $FILENAME "     " $FILE_SUMMARY
done

tput sgr0  # reset ANSI colors