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Ternary operator (?:) in Bash
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ternary operator ? : is just short form of if/else
case "$b" in
5) a=$c ;;
*) a=$d ;;
esac
Or
[[ $b = 5 ]] && a="$c" || a="$d"
share
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improve this an...
What is the difference between call and apply?
What is the difference between using call and apply to invoke a function?
24 Answers
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git cherry-pick not working
...e commit on your current branch. (Or that's what Git thinks, anyway.) Verify that the commit you are cherry-picking hasn't already been merged somehow, as either a proper merge, rebase/cherry-pick, or piecemeal patch. (Use git show <commit-id> to see the diff.)
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Split long commands in multiple lines through Windows batch file
...er that the caret and the newline following it are completely removed. So, if there should be a space where you're breaking the line, include a space. (More on that below.)
Example:
copy file1.txt file2.txt
would be written as:
copy file1.txt^
file2.txt
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Convert a timedelta to days, hours and minutes
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If you have a datetime.timedelta value td, td.days already gives you the "days" you want. timedelta values keep fraction-of-day as seconds (not directly hours or minutes) so you'll indeed have to perform "nauseatingly simple ...
In Postgresql, force unique on combination of two columns
...ique (col1, col2)
)
autoincrement is not postgresql. You want a serial.
If col1 and col2 make a unique and can't be null then they make a good primary key:
CREATE TABLE someTable (
col1 int NOT NULL,
col2 int NOT NULL,
primary key (col1, col2)
)
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ERROR: Error 1005: Can't create table (errno: 121)
...ly for you, and it brought me here. I quote:
You will get this message if you're trying to add a constraint with a
name that's already used somewhere else
To check constraints use the following SQL query:
SELECT
constraint_name,
table_name
FROM
information_schema.table_constrain...
How to estimate a programming task if you have no experience in it [closed]
I am having a difficult time with management asking for estimates on programming tasks that are using third-party controls that I have no prior experience with.
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fancybox - d.onCleanup is not a function
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Out of curiosity, why is this? It doesn't seem to work if the css files are all combined into one either...
– SeanJA
Apr 30 '11 at 4:59
3
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Delete all rows in an HTML table
...olution, provided of course that the JavaScript developer is allowed to modify the HTML.
– Blazemonger
Sep 1 '11 at 14:26
1
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