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Bash variable scope
...d work as well (because echo and while are in same subshell):
#!/bin/bash
cat /tmp/randomFile | (while read line
do
LINE="$LINE $line"
done && echo $LINE )
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How to output a multiline string in Bash?
...
Here documents are often used for this purpose.
cat << EOF
usage: up [--level <n>| -n <levels>][--help][--version]
Report bugs to:
up home page:
EOF
They are supported in all Bourne-derived shells including all versions of Bash.
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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": {
...
"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');
$o = new A('sheep','cat','dog');
// results:
// __construct with 1 param called: sheep
// __construct with 2 params called: sheep,cat
// __construct with 3 params called: sheep,cat,dog
?>
and, it seem every one a...
Standardize data columns in R
...
apply(scaled.dat, 2, sd)
Using built in functions is classy. Like this cat:
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Using curl POST with variables defined in bash script functions
...er to read an maintain the script than feeding the post data on curl's invocation line as in your attempt:
generate_post_data()
{
cat <<EOF
{
"account": {
"email": "$email",
"screenName": "$screenName",
"type": "$theType",
"passwordSettings": {
"password": "$password...