[英]How to use user input as history
I am writing a script that takes a lot of user input, then creates a file from that input. 我正在编写一个需要大量用户输入的脚本,然后根据该输入创建一个文件。 Some of the inputs are fairly repetitive, and so I would like to enable the up arrow functionality to include the strings that have already been put in. I am having difficulty finding out how to do this.
有些输入是相当重复的,因此我想启用向上箭头功能以包含已经放入的字符串。我很难找到如何执行此操作。
I have tried 我努力了
set -o history
but that only gives me the actual commands run, and not the inputs that have been received. 但这只会给我实际运行的命令,而不是已经收到的输入。 I also know that
我也知道
"\e[A"
is the up arrow command, but this is as far as I have gotten. 是向上箭头命令,但这是我已经得到的。 A test script is as follows:
测试脚本如下:
#!/bin/bash
set -o history
read -e date
read -e date2
read -e date3
echo $date $date2 $date3
After inputting $date
I would like to be able to up arrow and get the contents of $date
to use for $date2
. 在输入
$date
我希望能够向上箭头并获取$date
的内容以用于$date2
。 Any ideas? 有任何想法吗?
You can try to play with this little snippet: 您可以尝试使用这个小片段:
#!/bin/bash
HISTFILE=myhistoryfile
history -r
for i in {1..3}; do
read -ep "Enter date $i: " d
history -s "$d"
done
history -w
echo "Thanks for using this script. The history is:"
history
We define the file to be used as history file: myhistoryfile
and load it into memory with history -r
. 我们定义要用作历史文件的文件:
myhistoryfile
并将其加载到带有history -r
内存中。 Then we enter the loop and after each user input in variable d
we perform 然后我们进入循环,在变量
d
每个用户输入之后我们执行
history -s "$d"
to append the input d
to current history. 将输入
d
附加到当前历史记录。 At the end of the loop we perform 在循环结束时,我们执行
history -w
to actually write that to the history file. 实际上将其写入历史文件。
Try different combinations: with/without history -s
or history -w
to understand what they really do. 尝试不同的组合:有/无
history -s
或history -w
以了解他们真正做了什么。 And read the manual ! 并阅读手册 !
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