如何\n使用sed命令替换换行符()？
我没试成功:
sed 's#\n# #g' file
sed 's#^$# #g' file
我如何解决它？
错误
% javac StringTest.java
StringTest.java:4: variable errorSoon might not have been initialized
errorSoon[0] = "Error, why?";
码
public class StringTest {
public static void main(String[] args) {
String[] errorSoon;
errorSoon[0] = "Error, why?";
}
}
String match = "hello";
String text = "0123456789hello0123456789";
int position = getPosition(match, text); // should be 10, is there such a method?
该命令$ make all会产生错误,rm: cannot remove '.lambda': No such file or directory因此它会停止.我希望它忽略rm-not-found-errors.我怎么强迫？
Makefile文件
all:
make clean
make .lambda
make .lambda_t
make .activity
make .activity_t_lambda
clean:
rm .lambda .lambda_t .activity .activity_t_lambda
.lambda:
awk '{printf "%.4f \n", log(2)/log(2.71828183)/$$1}' t_year > .lambda
.lambda_t:
paste .lambda t_year > .lambda_t
.activity:
awk '{printf "%.4f \n", $$1*2.71828183^(-$$1*$$2)}' .lambda_t > .activity
.activity_t_lambda:
paste .activity t_year .lambda | sed -e 's@\t@\t\&\t@g' -e 's@$$@\t\\\\@g' | tee > .activity_t_lambda > ../RESULTS/currentActivity.tex
太麻烦了:
awk '{print " "$4" "$5" "$6" "$7" "$8" "$9" "$10" "$11" "$12" "$13}' things
1.打印一个: abcdefghijklmn
2.每一秒钟: acegikm
3.附加到URL的索引{ hello.com/,hej.com/,...,hallo.com/}:hello.com/a hej.com/b ... hallo.com/n
要么我错过了一些强烈反对或反对,似乎没有太多的程序员报价循环.
$ echo "hello1-`echo hello2-\`echo hello3-\`echo hello4\`\``"
hello1-hello2-hello3-echo hello4
通缉
hello1-hello2-hello3-hello4-hello5-hello6-...
我想通过代码获取当前运行的Android Emulator的IP地址.如何实现？
这些Python列表推导的R等价物是什么:
[(i,j) for i,j in zip(index, Values)]
[(i,j) for i,j in enumerate(Values)]
[(i,j) for i,j in enumerate(range(10,20))] %MWE, indexing or enumerating to
%keep up with the index, there may
%be some parameter to look this up
输出示例
>>> [(i,j) for i,j in enumerate(range(10,20))]
[(0, 10), (1, 11), (2, 12), (3, 13), (4, 14), (5, 15), (6, 16), (7, 17), (8, 18), (9, 19)]
我已经用R中的一些技巧解决了这个问题,但不记得了,第一个想法是itertools -pkg,但我希望找到一种更惯用的做事方式.