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Can I grep only the first n lines of a file?
...e very long log files, is it possible to ask grep to only search the first 10 lines?
12 Answers
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How to sort a Ruby Hash by number value?
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metrics = {"sitea.com" => 745, "siteb.com" => 9, "sitec.com" => 10 }
metrics.sort_by {|_key, value| value}
# ==> [["siteb.com", 9], ["sitec.com", 10], ["sitea.com", 745]]
If you need a hash as a result, you can use to_h (in Ruby 2.0+)
metrics.sort_by {|_key, value| value}.to_h
#...
How do I change the formatting of numbers on an axis with ggplot?
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FYI, this also works with scale_y_log10(labels = scales::comma), and I'm assuming other scales in ggplot2. Great tips!
– TheProletariat
Sep 19 '17 at 18:46
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Sleep until a specific time/date
... the following:
current_epoch=$(date +%s)
target_epoch=$(date -d '01/01/2010 12:00' +%s)
sleep_seconds=$(( $target_epoch - $current_epoch ))
sleep $sleep_seconds
To add precision down to nanoseconds (effectively more around milliseconds) use e.g. this syntax:
current_epoch=$(date +%s.%N)
targe...
How to check if a line is blank using regex
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edited Feb 10 '17 at 15:12
Elliot Labs LLC
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answered...
How to create a hex dump of file containing only the hex characters without spaces in bash?
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Giacomo1968
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answered Apr 10 '10 at 20:27
mark4omark4o
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Is leaked memory freed up when the program exits?
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answered Jun 4 '10 at 16:06
Justin EthierJustin Ethier
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How to get anchor text/href on click using jQuery?
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answered Apr 16 '10 at 11:06
SarfrazSarfraz
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Django - limiting query results
I want to take the last 10 instances of a model and have this code:
5 Answers
5
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bash HISTSIZE vs. HISTFILESIZE?
...Long answer:
All the info above + some examples:
Example 1:
HISTFILESIZE=10 and HISTSIZE=10
You start your session.
Your HISTFILE (file that stores your bash command history), is truncated to contain HISTFILESIZE=10 lines.
You write 50 lines.
At the end of your 50 commands, only commands 41 to...