Question

我有这个字符串

Alphabet = ABCDEFGHIJKLMNOPQRSTUVWXYZ

我希望让用户输入一个特定的单词来删除字母表中的字母;但是一旦我得到输入，我就不知道如何真正删除字符串中的字母，使其大小最小化为1。我写了以下代码：

#!/bin/bash

Alphabet="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
echo -n "Please enter your key: "
read -e KEY

Asize=`expr ${#Alphabet} - 1`
Ksize=`expr ${#KEY} - 1`

kcount=0

#A loop to go through the key characters
while [ $kcount -le $Ksize ]
    do
    D=${KEY:$kcount:1}

    Acount=0
#A loop to go through the alphabet characters to look for the current key letter to delete it
    while [ $Acount -le $Asize ]
    do
        if [ "${KEY:$kcount:1}" == "${Alphabet:$Acount:1}" ];

        then
            **REMOVING PART**
            break
        else
            Acount=$[$Acount+1]

如果有人知道我怎么做，我真的很感激他的帮助。谢谢。示例如下：

输入：CZB   输出：

Kcount = 0：ABDFGHIJLMNOPQRSTUVWXYZ

Kcount = 1：ABDFGHIJLMNOPQRSTUVWXY

Kcount = 2：ADFGHIJLMNOPQRSTUVWXY

Answer 1

$ foo="bar"
$ echo "${foo/a/}"
br

Parameter substitution

Answer 2

使用tr实用程序：

SYNOPSIS
     tr [-Ccu] -d string1
     …

DESCRIPTION
     The tr utility copies the standard input to the standard output with sub-
     stitution or deletion of selected characters.
     …

     -d      Delete characters in string1 from the input.

因此

#!/bin/bash
Alphabet="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
echo -n "Please enter your key: "
read -e KEY
echo "$Alphabet" | tr -d "$KEY"

如果您在提示符下键入ADFGHIJLMNOPQRSTUVWXY，

会生成输出CBZ。

在bash脚本中删除字符串中的字母

2 个答案: