bash 语法错误 : invalid arithmetic operator with token "@mail.com"

Question

我有一个执行 SQL SELECT 并使用输出发送一些电子邮件的脚本，但该脚本存在问题导致出现错误消息:

line 34: johne@mail.com: syntax error: invalid arithmetic operator (error token is "@mail.com")

第 34 行是:

if (( ${msgData[$email]:-0} < $(LC_TIME=C date -d yesterday +%s) )); then

这是脚本:

#!/bin/bash
${BASH_VERSION+shopt -s extglob lastpipe} 2>/dev/null

# Full path to a file to store our date offset data. Will be overwritten.
datefile=date.log

# Assign your vars or insert whatever code does so here.
user=user pass=pass db=db

function doit {
    typeset x
    for x; do
        if [[ -z $x ]]; then
            echo 'doit: missing an argument.' >&2
            return 1
        fi
    done

    typeset template=$(</dev/fd/4)
    exec 4<&-
    sqlplus "${1}/${2}@${3}" <&3 | {
        if [[ -f $datefile ]]; then
            . "$datefile" || return 1
        else
            # An associative array that maps from num -> timestamp
            typeset -A msgData
        fi

        # If we've successfully read the file containing timestamps, then overwrite with new data on RETURN
        ${msgData+trap 'trap RETURN; typeset -p msgData >"$datefile"' RETURN}

        while IFS=, read -r num email limit orders; do
            ${email:+:} continue
            if (( ${msgData[$email]:-0} < $(LC_TIME=C date -d yesterday +%s) )); then
                printf -- "$template" "email" "$num" "$limit" "$orders" |
                    /usr/sbin/sendmail -f sender@example.com -oi -t

                msgData[$email]=$(LC_TIME=C date +%s)
            else
                printf 'Mail already sent to %s within the last 24 hours... skipping.\n' "$email" >&2
            fi
        done
    }
} 5<&0 <<\SQL 3<&0 <<\TEMPLATE 4<&0 <&5-
set pagesize 0
set feedback 0

SELECT kred_lim.kunr ||','|| kust_adr.ku_email ||','|| kred_lim.kred_limit ||','|| kred_lim.kred_zu_zahlen
FROM kred_lim, kust_adr
WHERE kred_lim.kred_zu_zahlen > kred_lim.kred_limit
AND kred_lim.kunr = kust_adr.ku_nr;
SQL
Subject: Credit limit
To: %s

Customer number: %s
Credit limit: %s
Current orders: %s
TEMPLATE

if ! doit "$user" "$pass" "$db"; then
    echo 'we failed :(' >&2
    exit 1
fi

Answer 1

问题是您正试图在算术表达式中执行字符串比较。要么切换到复合表达式:

if [[ ${msgData[$email]:-0} < $(LC_TIME=C date -d yesterday +%s) ]]; then

或者检查您是否正在访问 msgData 的正确元素。