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How to determine if a process runs inside lxc/Docker?
... output of /proc/1/sched on a container
will return:
root@33044d65037c:~# cat /proc/1/sched | head -n 1
bash (5276, #threads: 1)
While on a non-container host:
$ cat /proc/1/sched | head -n 1
init (1, #threads: 1)
This helps to differentiate if you are in a container or not.
...
For each row in an R dataframe
...ve a dataframe, and for each row in that dataframe I have to do some complicated lookups and append some data to a file.
9 ...
What is PECS (Producer Extends Consumer Super)?
...y type. For the type Animal we can make the type Animal[]
covariant: a Cat[] is an Animal[];
contravariant: an Animal[] is a Cat[];
invariant: an Animal[] is not a Cat[] and a Cat[] is not an Animal[].
Java Examples:
Object name= new String("prem"); //works
List<Number> numbers = new Ar...
echo that outputs to stderr
...t, including arguments (-n) that echo would normally swallow:
echoerr() { cat <<< "$@" 1>&2; }
Glenn Jackman's solution also avoids the argument swallowing problem:
echoerr() { printf "%s\n" "$*" >&2; }
...
What static analysis tools are available for C#? [closed]
... product
PRQA QA·C#, commercial product
PVS-Studio, commercial product
CAT.NET, visual studio addin that helps identification of security flaws Edit November 2019: Link is dead.
CodeIt.Right
Spec#
Pex
SonarQube, FOSS & Commercial options to support writing cleaner and safer code.
Quali...
How to grep Git commit diffs or contents for a certain word?
...S (using --pickaxe-regex), we do so using an example diff and git diff invocation involving "regexec", "regexp", "regmatch", ...
The example is correct, but we can make it easier to untangle by avoiding writing "regex.*" unless it's really needed to make our point.
Use some made-up, non-re...
Pipe to/from the clipboard in Bash script
...send data to the clipboard that works with Ctrl + C, Ctrl + V in most applications.
If you're on Mac OS X, there's pbcopy. e.g cat example.txt | pbcopy
If you're in Linux terminal mode (no X) then look into gpm or screen which has a clipboard. Try the screen command readreg.
Under Windows 10+ or...
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
...
Rebasing a branch including all its children
...s, and won't
# run unless auto-rebase is empty. Leave this here to catch programming
# errors, and for possible future -f option.
git for-each-ref --format="%(refname)" $REF_NAMESPACE |
while read ref; do
echo git update-ref -d $ref
done
else
...
Exact difference between CharSequence and String in java [duplicate]
...kind of sharing is all right.
The + operator of String is compiled as invocations of various StringBuilder.append calls. So it is equivalent to
System.out.println(
(new StringBuilder())
.append("output is : ")
.append((Object)obj)
.append(" ")
.append(str)
.toString()
)
I must confes...