findgrep - finds files matching a file pattern and then grep found files using a regex pattern

findgrep

#!/bin/bash

RED="\e[31m"
GREEN="\e[32m"
BOLD="\e[1m"
ITALIC="\e[3m"
UNDERLINE="\e[4m"
END="\e[0m"

function usage {
    echo -e ""
    echo -e "\e[1m\e[32mNAME\e[0m "
    echo -e "\tfindgrep - finds files matching a file pattern and then grep found files using a regex pattern"
    echo -e "\e[1m\e[32mUSAGE\e[0m"
    echo -e "\t\e[1m\e[32mfindgrep\e[0m \e[1m\e[31mDIRECTORY FILE_PATTERN REGEX_PATTERN\e[0m"
    echo -e ""
    echo -e "\e[32m\e[1mDESCRIPTION\e[0m"
    echo -e "\t\e[1m\e[32mfindgrep\e[0m searches for the 1st pattern, \e[31m\e[1mFILE_PATTERN\e[0m, using syntax recognized by \e[1m\e[32mfind\e[0m."
    echo -e "\tAnd then searches for the 2nd pattern, \e[31m\e[1mREGEX_PATTERN\e[0m, uses regex syntax suitable for \e[1m\e[32mgrep -e\e[0m."
    echo -e ""
    echo -e "\e[32m\e[1mEXAMPLE\e[0m"
    echo -e "\tTo find all files in the current directory ending in \e[31m\e[1mnotes.txt\e[0m, which contain the text \e[31m\e[1multimate question\e[0m"
    echo -e "\tfollowed by the text \e[31m\e[1m42\e[0m, you would issue the following command:"
    echo -e ""
    echo -e "\t\tfindgrep ./ '*notes.txt' 'ultimate question.*42'"
    echo -e ""
}

# if correct number of arguments are not given, print usage
if [[ -z "$1" ]] || [[ -z "$2" ]] || [[ -z "$3" ]]
then
    usage
    exit 0
fi

function get_random_filename {
    FNAME="/tmp/findgrep_$RANDOM.txt"
}

function create_tmp_file {
    get_random_filename
    while [[ -f "$FNAME" ]]; do
        echo -e "\t$FNAME already exists, getting a new random filename..."
        get_random_filename
    done
}

create_tmp_file

# execute the find and grep commands
find $1 -type f -iname $2 -print0 > $FNAME
if [[ -f $FNAME ]]; then
    LINE_COUNT=`cat $FNAME | wc -m`
    if [ ! "$LINE_COUNT" -eq "0" ]; then
        xargs -0 -a $FNAME grep -i -e "$3" --color=always -H -n
    fi  
else
    echo "file $FNAME does not exist..."
fi

rm $FNAME 2>/dev/null

NAME

findgrep - finds files matching a file pattern and then grep found files using a regex pattern

USAGE

findgrep DIRECTORY FILE_PATTERN REGEX_PATTERN

DESCRIPTION

findgrep searches for the 1st pattern, FILE_PATTERN, using syntax recognized by find.
And then searches for the 2nd pattern, REGEX_PATTERN, uses regex syntax suitable for grep -e.