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Send string to stdin
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You can use one-line heredoc
cat <<< "This is coming from the stdin"
the above is the same as
cat <<EOF
This is coming from the stdin
EOF
or you can redirect output from a command, like
diff <(ls /bin) <(ls /usr/bin)
or you c...
How to make the 'cut' command treat same sequental delimiters as one?
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No need for cat here. You could pass < text.txt directly to tr. en.wikipedia.org/wiki/Cat_%28Unix%29#Useless_use_of_cat
– arielf
Aug 9 '14 at 20:10
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How to set environment variables from within package.json
... like this with new vars separated by a line break
Then prepend export $(cat .env | xargs) && before your script command.
Example:
{
...
"scripts": {
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"start": "export $(cat .env | xargs) && echo do your thing here",
"env": "export $(cat .env | xargs) &&...
Check existence of directory and create if doesn't exist
...file.exists(paste(mainDir, subDir, "/", sep = "/", collapse = "/"))) {
cat("subDir exists in mainDir and is a directory")
} else if (file.exists(paste(mainDir, subDir, sep = "/", collapse = "/"))) {
cat("subDir exists in mainDir but is a file")
# you will probably want to handle this sep...
Why are arrays covariant but generics are invariant?
...do with a List<Animal> - you can add any animal to it... including a cat. Now, can you logically add a cat to a litter of puppies? Absolutely not.
// Illegal code - because otherwise life would be Bad
List<Dog> dogs = new List<Dog>();
List<Animal> animals = dogs; // Awooga a...
Why can't I overload constructors in PHP?
...','.$a2.','.$a3.PHP_EOL);
}
}
$o = new A('sheep');
$o = new A('sheep','cat');
$o = new A('sheep','cat','dog');
// results:
// __construct with 1 param called: sheep
// __construct with 2 params called: sheep,cat
// __construct with 3 params called: sheep,cat,dog
?>
and, it seem every one a...
Standardize data columns in R
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apply(scaled.dat, 2, sd)
Using built in functions is classy. Like this cat:
share
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Using curl POST with variables defined in bash script functions
...er to read an maintain the script than feeding the post data on curl's invocation line as in your attempt:
generate_post_data()
{
cat <<EOF
{
"account": {
"email": "$email",
"screenName": "$screenName",
"type": "$theType",
"passwordSettings": {
"password": "$password...
How can I delete a newline if it is the last character in a file?
...ble (POSIX-compliant) alternative (slightly less efficient):
printf %s "$(cat in.txt)" > out.txt
Note:
If in.txt ends with multiple newline characters, the command substitution removes all of them - thanks, @Sparhawk. (It doesn't remove whitespace characters other than trailing newlines.)
Si...
My docker container has no internet
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First thing to check is run cat /etc/resolv.conf in the docker container. If it has an invalid DNS server, such as nameserver 127.0.x.x, then the container will not be able to resolve the domain names into ip addresses, so ping google.com will fail.
Se...