sed 사용 :

#!/bin/bash

E_BADARGS=23

if [ $# -ne "3" ]
then
  echo "Usage: `basename $0` \"<start_date>\" \"<end_date>\" file"
  echo "NOTE:Make sure to put dates in between double quotes"
  exit $E_BADARGS
fi

isDatePresent(){
        #check if given date exists in file.
        local date=$1
        local file=$2
        grep -q "$date" "$file"
        return $?

}

convertToEpoch(){
    #converts to epoch time
    local _date=$1
    local epoch_date=`date --date="$_date" +%s`
    echo $epoch_date
}

convertFromEpoch(){
    #converts to date/time format from epoch
    local epoch_date=$1
    local _date=`date  --date="@$epoch_date" +"%F %T"`
    echo $_date

}

getDates(){
        # collects all dates at beginning of lines in a file, converts them to epoch and returns a sequence of numbers
        local file="$1"
        local state="$2"
        local i=0
        local date_array=( )
        if [[ "$state" -eq "S" ]];then
            datelist=`cat "$file" | sed -r -e "s/^\[([^\[]+)\].*/\1/" | egrep  "^[0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2}"`
        elif [[ "$state" -eq "E" ]];then
            datelist=`tac "$file" | sed -r -e "s/^\[([^\[]+)\].*/\1/" | egrep  "^[0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2}"`

        else
            echo "Something went wrong while getting dates..." 1>&2
            exit 500
        fi

        while read _date
            do
                epoch_date=`convertToEpoch "$_date"`
                date_array[$i]=$epoch_date
                #echo "$_date" "$epoch_date" 1>&2

            (( i++ ))
            done<<<"$datelist"
        echo ${date_array[@]}


}

findneighbours(){
    # search next best date if date is not in the file using recursivity
    IFS="$old_IFS"
    local elt=$1
    shift
    local state="$1"
    shift
    local -a array=( "$@" )

    index_pivot=`expr ${#array[@]} / 2`
    echo "#array="${#array[@]} ";array="${array[@]} ";index_pivot="$index_pivot 1>&2
    if [ "$index_pivot" -eq 1 -a ${#array[@]} -eq 2 ];then

        if [ "$state" == "E" ];then
            echo ${array[0]}
        elif [ "$state" == "S" ];then
            echo ${array[(( ${#array[@]} - 1 ))]}
        else
            echo "State" $state "undefined" 1>&2
            exit 100
        fi

    else
        echo "elt with index_pivot="$index_pivot":"${array[$index_pivot]} 1>&2
        if [ $elt -lt ${array[$index_pivot]} ];then
            echo "elt is smaller than pivot" 1>&2
            array=( ${array[@]:0:(($index_pivot + 1)) } )
        else
            echo "elt is bigger than pivot" 1>&2
            array=( ${array[@]:$index_pivot:(( ${#array[@]} - 1 ))} )
        fi
        findneighbours "$elt" "$state" "${array[@]}"
    fi
}



findFirstDate(){
    local file="$1"
    echo "Looking for first date in file" 1>&2
    while read line
        do
            echo "$line" | egrep -q "^\[[0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2}\]" &>/dev/null
            if [ "$?" -eq "0" ]
            then
                #echo "line=" "$line" 1>&2
                firstdate=`echo "$line" | sed -r -e "s/^\[([^\[]+)\].*/\1/"`
                echo "$firstdate"
                break
            else
                echo $? 1>&2
            fi
        done< <( cat "$file" )



}

findLastDate(){
    local file="$1"
    echo "Looking for last date in file" 1>&2
    while read line
        do
            echo "$line" | egrep -q "^\[[0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2}\]" &>/dev/null
            if [ "$?" -eq "0" ]
            then
                #echo "line=" "$line" 1>&2
                lastdate=`echo "$line" | sed -r -e "s/^\[([^\[]+)\].*/\1/"`
                echo "$lastdate"
                break
            else
                echo $? 1>&2
            fi
        done< <( tac "$file" )


}

findBestDate(){

        IFS="$old_IFS"
        local initdate="$1"
        local file="$2"
        local state="$3"
        local first_elts="$4"
        local last_elts="$5"
        local date_array=( )
        local initdate_epoch=`convertToEpoch "$initdate"`

        if [[ $initdate_epoch -lt $first_elt ]];then
            echo `convertFromEpoch "$first_elt"`
        elif [[ $initdate_epoch -gt $last_elt ]];then
            echo `convertFromEpoch "$last_elt"`

        else
            date_array=( `getDates "$file" "$state"` )
            echo "date_array="${date_array[@]} 1>&2
            #first_elt=${date_array[0]}
            #last_elt=${date_array[(( ${#date_array[@]} - 1 ))]}

            echo `convertFromEpoch $(findneighbours "$initdate_epoch" "$state" "${date_array[@]}")`

        fi

}


main(){
    init_date_start="$1"
    init_date_end="$2"
    filename="$3"
    echo "problem start.." 1>&2
    date_array=( "$init_date_start","$init_date_end"  )
    flag_array=( 0 0 )
    i=0
    #echo "$IFS" | cat -vte
    old_IFS="$IFS"
    #changing separator to avoid whitespace issue in date/time format
    IFS=,
    for _date in ${date_array[@]}
    do
        #IFS="$old_IFS"
        #echo "$IFS" | cat -vte
        if isDatePresent "$_date" "$filename";then
            if [ "$i" -eq 0 ];then
                echo "Starting date exists" 1>&2
                #echo "date_start=""$_date" 1>&2
                date_start="$_date"
            else
                echo "Ending date exists" 1>&2
                #echo "date_end=""$_date" 1>&2
                date_end="$_date"
            fi

        else
            if [ "$i" -eq 0 ];then
                echo "start date $_date not found" 1>&2
            else
                echo "end date $_date not found" 1>&2
            fi
            flag_array[$i]=1
        fi
        #IFS=,
        (( i++ ))
    done

    IFS="$old_IFS"
    if [ ${flag_array[0]} -eq 1 -o ${flag_array[1]} -eq 1 ];then

        first_elt=`convertToEpoch "$(findFirstDate "$filename")"`
        last_elt=`convertToEpoch "$(findLastDate "$filename")"`
        border_dates_array=( "$first_elt","$last_elt" )

        #echo "first_elt=" $first_elt "last_elt=" $last_elt 1>&2
        i=0
        IFS=,
        for _date in ${date_array[@]}
        do
            if [ $i -eq 0 -a ${flag_array[$i]} -eq 1 ];then
                date_start=`findBestDate "$_date" "$filename" "S" "${border_dates_array[@]}"`
            elif [ $i -eq 1 -a ${flag_array[$i]} -eq 1 ];then
                date_end=`findBestDate "$_date" "$filename" "E" "${border_dates_array[@]}"`
            fi

            (( i++ ))
        done
    fi


    sed -r -n "/^\[${date_start}\]/,/^\[${date_end}\]/p" "$filename"

}


main "$1" "$2" "$3"

이것을 파일로 복사하십시오. 디버깅 정보를 보지 않으려면 디버깅이 stderr로 전송되므로 “2> / dev / null”을 추가하십시오.

답변