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How to check if a process id (PID) exists
In a bash script, I want to do the following (in pseudo-code):
10 Answers
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List of ANSI color escape sequences
...SI escape sequences you're looking for are the Select Graphic Rendition subset. All of these have the form
\033[XXXm
where XXX is a series of semicolon-separated parameters.
To say, make text red, bold, and underlined (we'll discuss many other options below) in C you might write:
printf("\033[31;1;...
Character reading from file in Python
In a text file, there is a string "I don't like this".
8 Answers
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What does “export” do in shell programming? [duplicate]
...me.
If a variable name is followed by =word, the value of the variable is set to word.
export returns an exit status of 0 unless an invalid option is encountered, one of the names is not a valid shell variable name, or -f is supplied with a name that is not a function.
You can also set variables a...
What is the difference between char array and char pointer in C?
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why i can set char *name; name="123"; but can do the same with int type? And after using %c to print name , the output is unreadable string: �?
– TomSawyer
Apr 23 at 19:52
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Convert integer into its character equivalent, where 0 => a, 1 => b, etc
...to convert an integer into its character equivalent based on the alphabet. For example:
12 Answers
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Bash tool to get nth line from a file
...consolidation of the proposed solutions with included run times for each.
Set Up
I have a 3.261 gigabyte ASCII text data file with one key-value pair per row. The file contains 3,339,550,320 rows in total and defies opening in any editor I have tried, including my go-to Vim. I need to subset this ...
How to find the nearest parent of a Git branch?
Let's say I have the following local repository with a commit tree like this:
20 Answers
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Only get hash value using md5sum (without filename)
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One way:
set -- $(md5sum $file)
md5=$1
Another way:
md5=$(md5sum $file | while read sum file; do echo $sum; done)
Another way:
md5=$(set -- $(md5sum $file); echo $1)
(Do not try that with back-ticks unless you're very brave an...
Is it possible to specify a starting number for an ordered list?
...ML 5; which is:
<!doctype html>
With that doctype, it is valid to set a start attribute on an ordered list. Such as:
<ol start="6">
<li>Lorem</li>
<li>Ipsum</li>
<li>Dolor</li>
</ol>
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