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Add up a column of numbers at the Unix shell
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. . .| x=$(echo <(cat)); echo $((0+${x// /+}+0)) if you want all bash all the time:
– qneill
Apr 3 '15 at 23:31
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How do you create different variable names while in a loop? [duplicate]
...ou can do this is with exec(). For example:
for k in range(5):
exec(f'cat_{k} = k*2')
>>> print(cat_0)
0
>>> print(cat_1)
2
>>> print(cat_2)
4
>>> print(cat_3)
6
>>> print(cat_4)
8
Here I am taking advantage of the handy f string formatting in Py...
Concatenating Files And Insert New Line In Between Files
I have multiple files which I want to concat with cat .
Let's say
7 Answers
7
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Polymorphism with gson
...ic interface IAnimal { public String sound(); }
The two derived classes, Cat:
public class Cat implements IAnimal {
public String name;
public Cat(String name) {
super();
this.name = name;
}
@Override
public String sound() {
return name + " : \"meaow...
How to capitalize the first letter of a String in Java?
... @dutt: No actually, that was perfectly fine too. But Rekin's modification made it perfect. ;)
– Adeel Ansari
Oct 11 '10 at 8:42
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Turning off auto indent when pasting text into vim
...sn't any easier than :set noai followed by :set ai. The suggestion of :r! cat is shorter.
– Leopd
May 26 '10 at 21:34
71
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How to make “if not true condition”?
I would like to have the echo command executed when cat /etc/passwd | grep "sysa" is not true.
6 Answers
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How do I access my SSH public key?
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cat ~/.ssh/id_rsa.pub or cat ~/.ssh/id_dsa.pub
You can list all the public keys you have by doing:
$ ls ~/.ssh/*.pub
share
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Prototypical inheritance - writing up [duplicate]
...rototype.
Another reason could be that to create a Hamster a lot of complicated calculations need be done on passed arguments that may be not available yet, again you could pass in dummy arguments but it could unnecessarily complicate your code.
Extending and overriding Parent functions
Sometimes...
MySQL Results as comma separated list
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You can use GROUP_CONCAT to perform that, e.g. something like
SELECT p.id, p.name, GROUP_CONCAT(s.name) AS site_list
FROM sites s
INNER JOIN publications p ON(s.id = p.site_id)
GROUP BY p.id, p.name;
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