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How to wait for a keypress in R?
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As someone already wrote in a comment, you don't have to use the cat before readline(). Simply write:
readline(prompt="Press [enter] to continue")
If you don't want to assign it to a variable and don't want a return printed in the console, wrap the readline() in an invisible():
invisib...
Remove carriage return in Unix
...now). Using this test file with a CR at the end of the first line only:
$ cat infile
hello
goodbye
$ cat infile | od -c
0000000 h e l l o \r \n g o o d b y e \n
0000017
dos2unix is the way to go if it's installed on your system:
$ cat infile | dos2unix -U | od -c
0000...
Stop pip from failing on single package when installing with requirements.txt
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Running each line with pip install may be a workaround.
cat requirements.txt | xargs -n 1 pip install
Note: -a parameter is not available under MacOS, so old cat is more portable.
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Set environment variables from file of key/value pairs
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This might be helpful:
export $(cat .env | xargs) && rails c
Reason why I use this is if I want to test .env stuff in my rails console.
gabrielf came up with a good way to keep the variables local. This solves the potential problem when going fr...
Add a prefix string to beginning of each line
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If your prefix is a bit complicated, just put it in a variable:
prefix=path/to/file/
Then, you pass that variable and let awk deal with it:
awk -v prefix="$prefix" '{print prefix $0}' input_file.txt
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Removing duplicate rows in Notepad++
Is it possible to remove duplicated rows in Notepad++, leaving only a single occurrence of a line?
12 Answers
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Parallelize Bash script with maximum number of processes
...k and we then want foo.jpeg and foo.out removed from the remote computer:
cat list_of_files | \
parallel --trc {.}.out -S server1,server2,: \
"my_script {} > {.}.out"
GNU Parallel makes sure the output from each job does not mix, so you can use the output as input for another program:
some-co...
Using Java to find substring of a bigger string using Regular Expression
...es.add(m.group(1));
}
return matches;
}
get_matches("FOO[BAR] FOO[CAT]", "\\[(.*?)\\]")) // returns [BAR, CAT]
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What is the 'instanceof' operator used for in Java?
...c {}
class Animal {}
class Dog extends Animal implements Domestic {}
class Cat extends Animal implements Domestic {}
Imagine a dog object, created with Object dog = new Dog(), then:
dog instanceof Domestic // true - Dog implements Domestic
dog instanceof Animal // true - Dog extends Animal
dog ...
Is there a way to make R beep/play a sound at the end of a script?
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I have a package (beepr) with the sole purpose of making notification sounds in R which should work cross-platform. Run the following to install beepr and make a sound:
install.packages("beepr")
library(beepr)
beep()
More info at github: https://github.com/rasmusab/beepr
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