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How can I get Docker Linux container information from within the container itself?
...tainer id can be found in /proc/self/cgroup
So you can get the id with :
cat /proc/self/cgroup | grep -o -e "docker-.*.scope" | head -n 1 | sed "s/docker-\(.*\).scope/\\1/"
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how to restart only certain processes using supervisorctl?
...k
[supervisord]
logfile=supervisord.log
pidfile=supervisord.pid
[program:cat1]
command=cat
[program:cat2]
command=cat
[program:cat3]
command=cat
[group:foo]
programs=cat1,cat3
[supervisorctl]
serverurl=unix://%(here)s/supervisor.sock
[rpcinterface:supervisor]
supervisor.rpcinterface_factory =...
List all indexes on ElasticSearch server?
...ie" : {
"aliases" : {
"rumpleteazer" : { },
"that_horrible_cat" : { }
}
}
}
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How do I use the lines of a file as arguments of a command?
...
If your shell is bash (amongst others), a shortcut for $(cat afile) is $(< afile), so you'd write:
mycommand "$(< file.txt)"
Documented in the bash man page in the 'Command Substitution' section.
Alterately, have your command read from stdin, so: mycommand < file.txt
...
Replace string within file contents
...
If you are on linux and just want to replace the word dog with catyou can do:
text.txt:
Hi, i am a dog and dog's are awesome, i love dogs! dog dog dogs!
Linux Command:
sed -i 's/dog/cat/g' test.txt
Output:
Hi, i am a cat and cat's are awesome, i love cats! cat cat cats!
Origina...
PHP expects T_PAAMAYIM_NEKUDOTAYIM?
... @Web_Developer, the reason that happens is because if you have a foreach($cats as cat the only acceptable character after the cat for a syntactically valid statement is a ::, as it would allow you to specify a static property of some class called cat. Eg, if cat class has a public static member cal...
When to use dynamic vs. static libraries
...eason to use dynamic libraries over static. Since Windows DLLs are not relocatable, code sharing often does not work (and usually each app ships and uses its own versions of the library anyways). The only real benefit is that it is easier to update the library.
– Zifre
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Bash Templating: How to build configuration files from templates with Bash?
... RHS references some variable that references itself:
#!/bin/bash
line="$(cat; echo -n a)"
end_offset=${#line}
while [[ "${line:0:$end_offset}" =~ (.*)(\$\{([a-zA-Z_][a-zA-Z_0-9]*)\})(.*) ]] ; do
PRE="${BASH_REMATCH[1]}"
POST="${BASH_REMATCH[4]}${line:$end_offset:${#line}}"
VARNAME="${B...
Combine two columns of text in pandas dataframe
...
if both columns are strings, you can concatenate them directly:
df["period"] = df["Year"] + df["quarter"]
If one (or both) of the columns are not string typed, you should convert it (them) first,
df["period"] = df["Year"].astype(str) + df["quarter"]
Beware of...
How can I resize an image dynamically with CSS as the browser width/height changes?
...ative units should make your life way easier, given we have the image of a cat:
Now we want this cat inside our code, while respecting aspect ratios:
img {
width: 100%;
height: auto;
}
<img src="https://www.petmd.com/sites/default/files/petmd-cat-happy-10.jpg" alt="cat">
...