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How can I delete a newline if it is the last character in a file?
...ble (POSIX-compliant) alternative (slightly less efficient):
printf %s "$(cat in.txt)" > out.txt
Note:
If in.txt ends with multiple newline characters, the command substitution removes all of them - thanks, @Sparhawk. (It doesn't remove whitespace characters other than trailing newlines.)
Si...
My docker container has no internet
...
First thing to check is run cat /etc/resolv.conf in the docker container. If it has an invalid DNS server, such as nameserver 127.0.x.x, then the container will not be able to resolve the domain names into ip addresses, so ping google.com will fail.
Se...
How to replace multiple substrings of a string?
...ent to change the results of previous replacements
For instance:
d = { "cat": "dog", "dog": "pig"}
my_sentence = "This is my cat and this is my dog."
replace_all(my_sentence, d)
print(my_sentence)
Possible output #1:
"This is my pig and this is my pig."
Possible output #2
"This is my dog and...
Piping command output to tee but also save exit code of command [duplicate]
... example.
$ { false ; echo $? > /tmp/false.status ; } | tee $logfile
$ cat /tmp/false.status
1
That way you can use the status file content to make further decisions.
I'm curious now whether there is a more eloquent way to accomplish this.
...
What must I know to use GNU Screen properly? [closed]
...ou're on and which other ones there are. Here is my setup:
[roel@roel ~]$ cat .screenrc
# Here comes the pain...
caption always "%{=b dw}:%{-b dw}:%{=b dk}[ %{-b dw}%{-b dg}$USER%{-b dw}@%{-b dg}%H %{=b dk}] [ %= %?%{-b dg}%-Lw%?%{+b dk}(%{+b dw}%n:%t%{+b dk})%?(%u)%?%{-b dw}%?%{-b dg}%+Lw%? %{=b d...
Turning multi-line string into single comma-separated
...
@Hussain cat thing | awk -F',' '{ print "'\''" $7 "'\' '" }' | paste -s -d ','
– starbeamrainbowlabs
May 2 '17 at 10:41
...
Difference between classification and clustering in data mining? [closed]
Can someone explain what the difference is between classification and clustering in data mining?
21 Answers
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Mocha / Chai expect.to.throw not catching thrown errors
... keeps failing on the thrown error, but If I wrap the test case in try and catch and assert on the caught error, it works.
...
Parsing command-line arguments in C?
...op. It should handle - as standard input. Note that using this would indicate that op_mode should be a static file scope variable. The filter() function takes argc, argv, optind and a pointer to the processing function. It should return 0 (EXIT_SUCCESS) if it was able to open all the files and a...
How to elegantly rename all keys in a hash in Ruby? [duplicate]
... "apple",
# "b" => "boss",
# "c" => "cat",
# "c1" => "cat 1"
# }
# => {"apple"=>"a val", "boss"=>"b val", "cat"=>{"cat 1"=>"c1 val", "c2"=>"c2 val"}, "d"=>"d val"}
#
class Hash
def rename_keys(map...