[英]Bash: Passing parameters using getopts
I know this is a simple question and I have been examining the getopts tutorials and examples, but I am stuck. 我知道这是一个简单的问题,我一直在研究getopts教程和示例,但是我很困惑。 If you check this link, you will see that with the help of @fedorqui, I have managed to write the code in order to get an element of an array in a file.
如果您检查此链接,您将看到在@fedorqui的帮助下,我设法编写了代码,以获取文件中数组的元素。
However, what I need is to parameterize the inputs so that the script will continue to work even if I change the order of inputs. 但是,我需要对输入进行参数化,以便即使更改输入的顺序脚本也可以继续工作。
This is the first code I wrote: 这是我编写的第一个代码:
#!/bin/bash
file=$3 row=$1 col=$2 str1="Hata: " str2=". satır " str3=". sütun yok"
if [ $row -gt 3 ]
then
echo $str1$row$str2$col$str3
elif [ $col -gt 3 ]
then
echo $str1$row$str2$col$str3
else
awk 'NR==row{print $col}' row=$row col=$col $file
fi
Now, the script works like $ ./tablooku.sh 3 2 tablom.dat
and the output is: 现在,脚本的工作方式类似于
$ ./tablooku.sh 3 2 tablom.dat
,输出为:
~/Desktop $ ./tablooku.sh 3 2 tablom.dat
Kopenhag
What I need to do is to translate this code so that when I enter $ ./tablooku.sh -r 3 -c 2 tablom.dat
, I get the script work. 我需要做的就是翻译这段代码,以便在输入
$ ./tablooku.sh -r 3 -c 2 tablom.dat
,脚本可以正常工作。
This is the code I wrote which stucks upon running: 这是我编写的在运行时卡住的代码:
#!/bin/bash
str1="Hata: "
str2=". satır "
str3=". sütun yok"
while getopts "r:c:f:" opts
do
case $opts in
r) row=$OPTARG echo "-r was triggered, Parameter: $OPTARG";;
c) col=$OPTARG echo "-c was triggered, Parameter: $OPTARG";;
f) fi=$OPTARG echo "-f was triggered, Parameter: $OPTARG";;
\?) printf "Kullanım: %s -r değer -c değer dosya adresi\n" $0
exit 2;;
esac
done
if [ $row -gt 3 ]
then
echo $str1$row$str2$col$str3
elif [ $col -gt 3 ]
then
echo $str1$row$str2$col$str3
else
awk 'NR==r{print $c}' r=$row c=$col $fi
fi
Can you please tell me what is wrong here? 你能告诉我这里有什么问题吗? When I run the command the system output is:
当我运行命令时,系统输出为:
~/Desktop $ ./go_test.sh -r 3 -c 2 tablom.dat
-r was triggered, Parameter: 3
-c was triggered, Parameter: 2
./go_test.sh: line 23: [: -gt: unary operator expected
./go_test.sh: line 26: [: -gt: unary operator expected
The prompt stucks and I have to use ctrl+z
to break the waiting. 提示卡住了,我必须使用
ctrl+z
来打破等待状态。 It looks like I am failing to assign the file location to fi
but I could not solve the problem 看来我无法将文件位置分配给
fi
但是我无法解决问题
Note: Please remember -r is row, - c is column and the last parameter is the file location which does not use any option code (such as -f) 注意:请记住-r是行,-c是列,最后一个参数是不使用任何选项代码的文件位置(例如-f)
UPDATE 1: 更新1:
I changed the if brackets ]
with ]]
and [
with [[
. 如果括号我改变了
]
与]]
和[
用[[
。 Now the unary operator expected
error is gone. 现在,
unary operator expected
错误已消失。 Now, the prompt waits and does not print -f was triggered, Parameter:...
I still use ctrl+z
to break the waiting. 现在,提示等待并且不打印
-f was triggered, Parameter:...
我仍然使用ctrl+z
来打破等待。
UPDATE 2: 更新2:
With the suggestion of both @grebneke and @TimK, I added the semi-colons and changed the fi
parameter to fil
. 在@grebneke和@TimK的建议下,我添加了分号并将
fi
参数更改为fil
。 This way, I get the script working. 这样,我就可以运行脚本了。 However, there is one little problem remaining.
但是,仍然存在一个小问题。 The code works if I enter
$ ./tablooku.sh -r 3 -c 2 -f tablom.dat
. 如果输入
$ ./tablooku.sh -r 3 -c 2 -f tablom.dat
则该代码有效。 However, I need it to run without having to write -f
. 但是,我需要它运行而不必编写
-f
。 Is it possible? 可能吗?
In these lines: 在这些行中:
r) row=$OPTARG echo "-r was triggered, Parameter: $OPTARG";;
c) col=$OPTARG echo "-c was triggered, Parameter: $OPTARG";;
f) fi=$OPTARG echo "-f was triggered, Parameter: $OPTARG";;
You are assigning row/col/fi
for the remainder of the line only. 您仅为行的其余部分分配
row/col/fi
行。 Add a semicolon after the assignment and it will stay assigned for the rest of the script: 在分配之后添加分号,它将在其余脚本中保持分配状态:
r) row=$OPTARG; echo "-r was triggered, Parameter: $OPTARG";;
c) col=$OPTARG; echo "-c was triggered, Parameter: $OPTARG";;
f) fi=$OPTARG; echo "-f was triggered, Parameter: $OPTARG";;
Edit <deleted, I misunderstood the question>
编辑
<deleted, I misunderstood the question>
Edit 2 To get the remaining arguments after using getopts
, you must shift
like this: 编辑2要在使用
getopts
之后获取其余参数,您必须像这样进行shift
:
while getopts "r:c:" opts
do
...
done
shift $(( $OPTIND-1 ))
# Now, $1, $2 etc are your arguments as you are used to:
$ ./tablooku.sh -r 3 -c 2 tablom.dat
# $1 will be "tablom.dat"
You're missing a semi-colon in where you're setting $row, $col, and $fi. 您在设置$ row,$ col和$ fi的位置缺少分号。
case $opts in
r) row=$OPTARG echo "-r was triggered, Parameter: $OPTARG";;
c) col=$OPTARG echo "-c was triggered, Parameter: $OPTARG";;
f) fi=$OPTARG echo "-f was triggered, Parameter: $OPTARG";;
\?) printf "Kullanım: %s -r değer -c değer dosya adresi\n" $0
exit 2;;
esac
Should be (semi-colon before the echo
): 应该是(
echo
之前的分号):
case $opts in
r) row=$OPTARG ; echo "-r was triggered, Parameter: $OPTARG";;
c) col=$OPTARG ; echo "-c was triggered, Parameter: $OPTARG";;
f) fi=$OPTARG ; echo "-f was triggered, Parameter: $OPTARG";;
\?) printf "Kullanım: %s -r değer -c değer dosya adresi\n" $0
exit 2;;
esac
Without those semi-colons, your commands are not being run as you would expect, as you can see looking at the output of bash -x, and examine the lines with -gt: 如果没有这些分号,您的命令将无法按预期运行,因为您可以看到bash -x的输出,并使用-gt检查行:
bash-[576]$ bash -x foo.bash -r 3 -c 3 -f foo
+ str1='Hata: '
+ str2='. satır '
+ str3='. sütun yok'
+ getopts r:c:f: opts
+ case $opts in
+ row=3
+ echo '-r was triggered, Parameter: 3'
-r was triggered, Parameter: 3
+ getopts r:c:f: opts
+ case $opts in
+ col=3
+ echo '-c was triggered, Parameter: 3'
-c was triggered, Parameter: 3
+ getopts r:c:f: opts
+ case $opts in
+ fi=foo
+ echo '-f was triggered, Parameter: foo'
-f was triggered, Parameter: foo
+ getopts r:c:f: opts
+ '[' -gt 3 ']'
foo.bash: line 18: [: -gt: unary operator expected
+ '[' -gt 3 ']'
foo.bash: line 20: [: -gt: unary operator expected
+ awk 'NR==r{print $c}' r= c=
With the semi-colons: 使用分号:
bash-[574]$ bash -x foo.bash -r 3 -c 3 -f foo
+ str1='Hata: '
+ str2='. satır '
+ str3='. sütun yok'
+ getopts r:c:f: opts
+ case $opts in
+ row=3
+ echo '-r was triggered, Parameter: 3'
-r was triggered, Parameter: 3
+ getopts r:c:f: opts
+ case $opts in
+ col=3
+ echo '-c was triggered, Parameter: 3'
-c was triggered, Parameter: 3
+ getopts r:c:f: opts
+ case $opts in
+ fi=foo
+ echo '-f was triggered, Parameter: foo'
-f was triggered, Parameter: foo
+ getopts r:c:f: opts
+ '[' 3 -gt 3 ']'
+ '[' 3 -gt 3 ']'
+ awk 'NR==r{print $c}' r=3 c=3 foo
Again, look at the lines with -gt. 再次,用-gt查看行。 So your variable settings of $row, $col, and $fi are not propagating without the
;
因此,如果没有$,$ col和$ fi的变量设置,则不会传播
;
. 。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.