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How can I add numbers in a Bash script?
...um=$((num1 + 2 + 3)) # ...
num=$[num1+num2] # Old, deprecated arithmetic expression syntax
Using the external expr utility. Note that this is only needed for really old systems.
num=`expr $num1 + $num2` # Whitespace for expr is important
For floating point:
Bash doesn'...
How to apply shell command to each line of a command output?
... to append a random ID between 1000 and 15000, when SED matches a line. cat /logs/lfa/Modified.trace.log.20150904.pw | sed -r 's/^(.*)(\|006\|00032\|)(.*)$/echo "\1\2\3 - ID `shuf -i 999-14999 -n 1`"/e'
– sgsi
Sep 8 '15 at 21:37
...
Checking if a string array contains a value, and if so, getting its position
...accepted answer because it allows one to pass in a lambda to do more complicated things like Array.FindIndex(array, x => x.StartsWith("insert string here"))
– reggaeguitar
Apr 2 '14 at 21:33
...
Bash ignoring error for a particular command
...
The solution:
particular_script || true
Example:
$ cat /tmp/1.sh
particular_script()
{
false
}
set -e
echo one
particular_script || true
echo two
particular_script
echo three
$ bash /tmp/1.sh
one
two
three will be never printed.
Also, I want to add that when pipefai...
Count occurrences of a char in a string using Bash
...rs.
Multiple lines of input are also good for this solution, like command cat mytext.txt | tr -cd 'e' | wc -c can counts e in the file mytext.txt, even thought the file may contain many lines.
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How to check the version of GitLab?
...
cd /opt/gitlab
cat version-manifest.txt
Example:
gitlab-ctl 6.8.2-omnibus
gitlab-rails v6.8.2
Current gitlab version is 6.8.2
share
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Convert array of strings into a string in Java
...
From Java 8, the simplest way I think is:
String[] array = { "cat", "mouse" };
String delimiter = "";
String result = String.join(delimiter, array);
This way you can choose an arbitrary delimiter.
shar...
How do I pass multiple attributes into an Angular.js attribute directive?
...wered Mar 16 '17 at 17:35
Ilker CatIlker Cat
9821212 silver badges1313 bronze badges
...
Modulo operator with negative values [duplicate]
... I think no matter which way and how many times you skin that cat, the fundamental fact is that divide and modulo with signed operands is implementation defined. There's always a "which way" choice in some guise or another. The guaranteed identity at the end of that quote is what's impo...
Creating a constant Dictionary in C#
...hough not necessarily a nice one; remember that according to the C# specification, switch-case tables are compiled to constant hash jump tables. That is, they are constant dictionaries, not a series of if-else statements. So consider a switch-case statement like this:
switch (myString)
{
case "c...