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File content into unix variable with newlines
...anscript for a demo:
pax> cat num1.txt ; x=$(cat num1.txt)
line 1
line 2
pax> echo $x ; echo '===' ; echo "$x"
line 1 line 2
===
line 1
line 2
The reason why newlines are replaced with spaces is not entirely to do with the echo command, rather it's a combination of things.
When given a ...
How do I build a numpy array from a generator?
...erate(gimme()): my_array[i] = el
1 is probably what you're looking for. 2 is space inefficient, and 3 is time inefficient (you have to go through the generator twice).
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How can I get nth element from a list?
...
Look here, the operator used is !!.
I.e. [1,2,3]!!1 gives you 2, since lists are 0-indexed.
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How can I do DNS lookups in Python, including referring to /etc/hosts?
... |
edited Mar 7 '19 at 22:59
Justin M. Keyes
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How to see which flags -march=native will activate?
...
152
You can use the -Q --help=target options:
gcc -march=native -Q --help=target ...
The -v optio...
git ahead/behind info between master and branch?
...
324
Here's a trick I found to compare two branches and show how many commits each branch is ahead o...
Update multiple rows in same query using PostgreSQL
...zable:
update test as t set
column_a = c.column_a
from (values
('123', 1),
('345', 2)
) as c(column_b, column_a)
where c.column_b = t.column_b;
You can add as many columns as you like:
update test as t set
column_a = c.column_a,
column_c = c.column_c
from (values
('123...
tmux: How to join two tmux windows into one, as panes?
...ually I found the way to do that. Suppose the two windows are number 1 and 2. Use
join-pane -s 2 -t 1
This will move the 2nd window as a pane to the 1st window. The opposite command is break-pane
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Apache Spark: map vs mapPartitions?
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122
What's the difference between an RDD's map and mapPartitions method?
The method map conver...