Question

我很想知道如何在同一个脚本文件中创建更详细的输出。我想修改脚本，以便在找到货币代码的匹配行后，输出以下内容：

Currency code: {currency code value}     
Currency name: {currency name value}   
Units per USD: {units value}
USD per unit : {USD value}

到目前为止我所拥有的：

#!/bin/bash

# Set local variable $cc to first command line argument, if present
cc=$1
# execute the do loop while $curr is blank
while [ -z "$curr" ]
do
# test if $cc is blank.  If so, prompt for a value
    if [ -z "$cc" ]
    then
        echo -n "Enter a currency code: "
        read cc
    fi
    # Search for $cc as a code in the curr.tab file
    curr=`grep "^$cc" curr.tab`
    # clear cc in case grep found no match and the loop should be repeated
    cc=
done
# echo the result
echo $curr

我正在使用的curr.tab看起来像这样：

USD US Dollar          1.0000000000 1.0000000000
EUR Euro               0.7255238463 1.3783144484
GBP British Pound      0.6182980743 1.6173428992
INR Indian Rupee      61.5600229886 0.0162443084
AUD Australian Dollar  1.0381120551 0.9632871472
CAD Canadian Dollar    1.0378792155 0.9635032527
AED Emirati Dirham     3.6730001428 0.2722570000
MYR Malaysian Ringgit  3.1596464286 0.3164911083

Answer 1

最后，而不是echo $curr做：

[[ $curr =~ ^(...)[[:space:]]+(.+)([[:space:]]+([[:digit:]\.]+)){2}$ ]]
printf "Currency code: %s\nCurrency name: %s\nUnits per USD: %s\nUSD per unit : %s\n" "${BASH_REMATCH[@]:1}"

在Unix脚本中创建循环

1 个答案: