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Trying to embed newline in a variable in bash [duplicate]
...ine in the source code
p="${var1}
${var2}"
echo "${p}"
Using $'\n' (only bash and zsh)
p="${var1}"$'\n'"${var2}"
echo "${p}"
Details
1. Inserting \n
p="${var1}\n${var2}"
echo -e "${p}"
echo -e interprets the two characters "\n" as a new line.
var="a b c"
first_loop=true
for i in $var
do
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Extract file name from path, no matter what the os/path format
Which Python library can I use to extract filenames from paths, no matter what the operating system or path format could be?
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How to delete duplicate lines in a file without sorting it in Unix?
... line is found and then seen[$0] == 2, and so on.
Awk evaluates everything but 0 and "" (empty string) to true. If a duplicate line is placed in seen then !seen[$0] will evaluate to false and the line will not be written to the output.
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How do I merge changes to a single file, rather than merging commits?
I have two branches (A and B) and I want to merge a single file from branch A with a corresponding single file from Branch B.
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Copy a table from one database to another in Postgres
I am trying to copy an entire table from one database to another in Postgres. Any suggestions?
19 Answers
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Printing everything except the first field with awk
...
Assigning $1 works but it will leave a leading space: awk '{first = $1; $1 = ""; print $0, first; }'
You can also find the number of columns in NF and use that in a loop.
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How to implement a good __hash__ function in python [duplicate]
...hen implementing a class with multiple properties (like in the toy example below), what is the best way to handle hashing?
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Is cout synchronized/thread-safe?
...ng. However, do things like cout get special treatment in the standard library?
4 Answers
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Check whether a path is valid in Python without creating a file at the path's target
...
tl;dr
Call the is_path_exists_or_creatable() function defined below.
Strictly Python 3. That's just how we roll.
A Tale of Two Questions
The question of "How do I test pathname validity and, for valid pathnames, the existence or writability of those paths?" is ...
How to develop a soft keyboard for Android? [closed]
I would like to play around with some ideas and develop a soft keyboard for Android to replace the default one.
4 Answers
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