Month: November 2020
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MongoDB change or update field type
Many a times developer do ask a common question that, we need to change existing data bearing field’s data type to another data type with out hampering existing data. Such as example, in database date field was in string value, but need to convert it in ISODate() format. Before going to nitty gritty details of……
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3. Shell comparison operator & reference
Command Description Example & Run the previous command in the background ls & && Logical AND if [ “$X” -ge “0” ] && [ “$X” -le “9”] || Logical OR if [ “$X” -lt “0” ] || [ “$X” -gt “9” ] ^ Start of line grep “^X” $ End of line grep “X$” =……
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2. Shell script loop & conditional statement
Like other programming languages, shell script also have same loop concept, let us look at different types of loop syntax how it will work in shell scripts. For loop While Loops : always define as true, test below example. read is the command take user input, we will learn it later in details. Creating Directory……
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Run Shell script in Windows 10
Yes we can use Woindows 10 for execution of bash script. You need to change following things to make it enabled. After reboot open browser and hit https://aka.ms/wslstore will open store and install ubuntu. Now store a shell file given below to your desktop with .sh file extension. Example : test.sh Then go to terminal……
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1. Shell script comment variable and wildcard
As we probably all know, shell script is badly required, when you thought to automate something in your operating system. We are here using Born shell(sh) and bash in linux ubuntu. Shell Comments We are making comments placing # symbol at the beginning of line which we need to comment out, or write comment should……
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MongoDB export (mongoexport) using aggregation
When we are thinking for exporting data in csv, tsv or json format from MongoDB then probably one tool we are using that is mongoexport. This is pretty straight forward and setting up all parameters will get back your desired data in desired format, but in this article we are talking about some situation which……