“bash if null or empty” Code Answer

bash if null or empty

csharp by No Name Pro         on Apr 19 2020 Comment

17

if [ -z "$variable" ]; then echo "$variable is null"; else echo "$variable is not null"; fi

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• list conda environments
• conda list envs
• remove function string c++
• removing a character from a string in c++
• input a string in c++
• c++ try catch
• c++ reverse vector
• convert whole string to lowercase c++
• remove element by index from vector c++
• convert string to char c++
• string to char array c++
• cpp print vector
• c++ vector print
• user input c++

• TypeScript

• install typescript using npm
• bootstrap add angular command
• installing bootstrap in angular 9
• install ng bootstrap in angular 14
• install ng bootstrap
• ngbmodal angular 9 yarn install
• how to see all commits in git
• create react project with typescript
• yarn create react app typescript
• npx react typescript
• create react app template typescript
• create react app with typescript config
• File C:\Users\Tariqul\AppData\Roaming\npm\ng.ps1 cannot be loaded because running scripts is disabled on this system.
• cannot be loaded because running scripts is disabled on this system
• git@github.com: Permission denied (publickey). fatal: Could not read from remote repository. Please make sure you have the correct access rights and the repository exists.
• Can't bind to 'formGroup' since it isn't a known property of 'form
• ts-node call function from command line
• how to run typescript file
• how to run typescript
• run typescript node
• google fonts roboto
• microsoft execution policies
• The file C:\Users\user\AppData\Roaming\npm\ng.ps1 is not digitally signed. You cannot run this script on the current system. For more information about running scripts and setting execution policy, see about_Execution_Policies at
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• policies for setting virtual environment -python
• ng : File C:\Users\nEW u\AppData\Roaming\npm\ng.ps1 cannot be loaded. The file C:\Users\nEW u\AppData\Roaming\npm\ng.ps1 is setting execution policy, see about_Execution_Policies at https:/go.microsoft.com/fwlink/?LinkID=135170. At line:1 char:1
• npm ng.ps1 cannot be loaded because running scripts is disabled on this system grepper
• because running scripts is disabled on this system. For more information, see about_Execution_Policies at https:/go.microsoft.com/fwlink/?LinkID=135170.
• check if file exists bash
• how check is file exist linux

• Dart

• Flutter turn string to int
• how to use hexadecimal color in flutter
• image from assets in flutter
• text fieldform color flutter
• how to change input text color in flutter
• loop in dart
• rounded raisedbutton in flutter
• flutter use png as icon
• asset image in circle avatar flutter
• circle avatar from image asset flutter
• flutter get current date
• round border container flutter
• rounded borders for container in flutte
• make a rounded container flutte
• flutter container rounded corners
• TextStyle underline flutter
• underline text in flutter
• flutter button with icon
• flutter list tile
• flutter get width of screen
• screen size flutter
• dart convert string to datetime
• how to add padding flutter
• dart random number
• flutter text right overflowed
• text overflow ellipsis flutter
• flutter launcher icon generate
• flutter text color
• flutter text button
• flutter date time to timestamp

• C

• ModuleNotFoundError: No module named 'cv2'
• read files in c
• c concatenate strings
• fahrenheit to celsius formula
• write in file in c
• boolean in c
• install gitk mac
• how to print int in c
• c how to get an integer from user input
• latex font sizes
• random number c
• print an array in c
• how to genrate a random number in C
• factorial c program using for loop
• sleep in c programming
• install zoom on ubuntu
• how to get user input in c
• take array as input in c
• remove element from np array
• what is strikethrough in markdown
• print boolean value in c
• printf with bool
• how to print boolean in c
• array loop in c
• see if two strings are equal in C
• check dns server in linux
• invoke-webrequest download file
• css google fonts
• how to download file in powershell
• how to use google fonts in css

• Go

• mongo console find by id
• drop mongo database
• golang convert string to int
• golang convert int to string
• Google Collab Data Load
• connect google drive to colab
• mounting google drive in colab
• Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.20.1:test (default-test) on project upload
• golang string split
• mongodb export entire database
• go convert integer to string
• unzip a file in google colab
• golang convert string to int64
• golang byte to string
• how to check if a value exists in map golang
• golang check if key is in map
• how to check if value exiets in map in go
• go map check key exists
• golang map has key
• check string contains golang
• golang delete element from array
• go string to byte array
• golang convert string to float
• random number golang
• golang read file
• golang string to bytes
• let it go
• date format golang
• initialize map in golang
• interface to string golang

• Ruby

• kill puma pid local
• rails kill server
• kill port already in use
• destroy existed port
• ruby each do method
• how to check ruby version
• contains ruby array
• ruby array has element
• how to I change the name of a column in rails
• how to delete a table in rails
• rails image tag
• add references rails migration
• ruby read file
• how to remove columns from rails
• ruby iterate over array
• Your Ruby version is 3.0.0, but your Gemfile specified 2.7.4
• Your Ruby version is 2.7.0, but your Gemfile specified 2.7.1
• A Ruby write to file example
• redis localhost url
• rails remove column from model
• rails migration update column default value
• ruby get current datetime
• button in rails
• login into postgresql through terminal
• rails migration change type of column
• integer to string ruby
• if contains ruby
• ruby hash merge
• rails remove model
• drop rails all db

• Lua

• lua for loop
• for key in lua
• kerbal space program 2
• how to get a random number in lua
• print table lua
• wait function lua
• lua add table to value
• lua string to number
• lua add to table
• roblox get player from character
• lua round number
• lua loop through table
• lua in pairs
• how to make a part rotate roblox
• Lua array add item
• roblox key pressed script
• roblox go thru all players
• loop true childs roblox
• continue in lua
• sleep function lua
• lua for each in table
• lua multiline comment
• how to make a color changing brick in roblox studio
• roblox on touch script
• user input lua
• conda find package version
• if string contains lua
• string to int lua
• roblox check if player has gamepass
• lua click detection

• Swift

• create alert in swift
• use timer swift
• string to capital letter dart
• dart capitalize first letter of each word
• convert string to int swift
• swift change navigation bar color
• swift generate random number
• time formats swift
• swift stirng to date
• swift get current time
• swift hide navigation bar
• increase the size of the image in Swiftui
• convert data to json swift
• swift convert data to dictionary
• date formatter swift
• Split a String into an array in Swift
• swift do catch
• center text swiftui
• conert data to string swift
• swift + data to string
• swift append element to array
• add corner radius to uiview swift
• add top corner radius swift
• swift for loop index
• swift convert dictionary to json
• uicolor from hex swift
• swift array to string
• swift how to sort array
• how to download swift
• replace character in swift

• Kotlin

• for loop kotlin
• kotlin for i in 0 until
• kotlin list add
• setOnClickListener example kotlin
• user input in kotlin
• zsh: command not found: adb
• kotlin convert array to arrayList
• kotlin date to string
• date format kotlin
• coroutines kotlin android dependency
• kotlin add element to array
• toast in kotlin
• how to declare string array in kotlin
• string array in kotlin
• on click in kotlin
• kotlin read input as int
• import svg icon to android studio
• latest kotlin version
• kotlin random number
• how to handle onbackpressed in fragment
• create empty array in kotlin
• static variable in kotlin
• kotlin check if string contains
• get current time in kotlin
• format string kotlin
• how to call a function after delay in kotlin android
• android recyclerview scroll to bottom
• kotlin not configured android studio
• gradient in android studio
• Cannot inline bytecode built with JVM target 1.8 into bytecode that is being built with JVM target 1.6. Please specify proper '-jvm-target' option

• R

• r remove na from dataset
• read csv in r
• read csv file in r
• r replace na with 0
• sort dataframe r
• how to eliminate duplicates in a column in r
• rename column in r
• rename variables in r
• convert list to dataframe r
• select columns in r
• r combine strings
• normalization in r
• random integer in r
• how to split a column in r
• remove elements from character vector in r
• how to change column names in r
• loop through list in r
• r rename columns
• R, how to count missing values in a column
• how to count the number of NA in r
• how to title plot in r
• delete rows by rowname in R
• r change a single value in a dataframe
• r clean environment
• set row names in r
• r count number of na
• rename columns based on a variable in r
• r split string column by delimiter
• r remove rows where value is 0
• remove na from vector r

• VBA

• regex numeric digits
• excel vba last row
• excel vba last row in range
• excel vba copy entire sheet paste values
• vba copy paste value only
• string to date vb
• xl vba double quotes in string literal
• excel formula how to create strings containing double quotes
• xlvba double quotes in string literal
• vba array length
• vba how to convert a column number into an Excel column
• excel-vba how to convert a column number into an excel column
• excel vba function to convert column number to letter
• vba code to remove duplicates from a column
• vba check if file exists
• vba delete file
• write to text file vb.net
• excel vba copy range with filter
• vb.net remove last char from string
• vba string to date
• excel vba wait
• vba full date format
• vba count all row
• vba loop through files in folder
• vba loop through recordset
• random number generator vb.net
• xl vba check for folder
• excelvba check for directory
• xlvba check for folder
• excel vba check if directory exists

• Rust

• rust take user input
• rust convertinging string to int
• convert string to i32
• random number generator in rust
• how to concatenate two &str in rust
• read file contents in rust
• rust get command line arguments
• rustlang error: linker `link.exe` not found
• get length of string rust
• rust convert integer to string
• how to index a string in rust
• rust lang sleep
• rust empty vector
• how to read from stdin rust
• rust u8 to string
• create file rust
• how to open a file rust
• rust random number in range
• rust copy trait
• check if a file exists rust
• rust type of
• How to know the data type in rust
• array as a parameter rust
• rust get current directory
• how to split a string by spaces rust
• rust reverse an array
• how to create a window in rust lang
• convert string to i32 rust
• return function rust
• rust check if key in hashmap

• Assembly

• flutter button border radius
• using shape property in flutter for circular corner
• press button on enter
• The type or namespace name 'IEnumerator' could not be found (are you missing a using directive or an assembly reference?)
• x86 assembly hello world
• latex image textwidth
• fatal error: opencv2/core/version.hpp: No such file or directory
• docker cannot stop container
• vmware workstation player disable side channel mitigations
• Cannot open self /usr/local/bin/docker-compose
• array month name
• openssl public key der to pem
• google apps script format date string
• flops in deep learning
• chrome can't change webcam
• pickle dump into specific directory
• how to open chrome in vbscript

• Matlab

• to detect if a data frame has nan values
• matlab how to set figure size so you can see plot
• No module named 'imblearn'
• create empty dataframe r with column names
• if directory exist matlab
• save mat file script in matlab directory
• matlab plotting functions
• matlab symbolic derivative
• matlab font size axis
• matlab unix time to datetime
• read all files from folder matlab

• Scala

• ValueError: If using all scalar values, you must pass an index
• scala hello world
• scala random number
• how to tell what type a variable is scala
• scala concatenate list
• scala reverse list
• scala match default
• two dimensional array scala
• scala get file from url as string
• scala schemaPayload json
• how to transform Nil to None scala

• BASIC

• mongodb command remove by _id
• how to send basic auth using fetch
• cmd cd not working
• how to open d drive using conda prompt
• cmd cant change directory
• vb string to int32
• how to make vbs error message box
• how to add basic authentication on haproxy backend server

• GDScript

• godot get root node
• godot get scene root
• godot get global position 3
• godot get global position 3d
• godot close game
• godot check if timer is running
• gdscript for loop
• godot 2d set position to mouse
• godot check if object is in group
• godot check left mouse button
• godot exit func
• godot make string all lowercase
• godot progrssbar set max value in code
• godot ignore function
• godot check if in exported version

• Haskell

• haskell string split
• last element of list haskell
• quicksort in haskell
• sort list haskell
• int to float haskell
• haskell multiline comment
• string to list haskell
• get first char from string haskell
• type signature haskell
• function signature haskell

• PowerShell

• windows 10 debloat
• debloat window 10
• error: could not install packages due to an oserror: [winerror 2] the system cannot find the file specified: 'c:\\python310\\scripts\\chardetect.exe' -> 'c:\\python310\\scripts\\chardetect.exe.deleteme'
• disable defender powershell
• powershell display firewall rules name

• Excel

• remove space from excel cell
• Google Sheets How to Count business Days Between Two Dates
• google sheets split cell by delimiter
• google sheet split text
• google sheets return multiple columns with vlookup
• google sheets convert string to date
• google sheets count dates that fall within date range
• google sheets countif current month
• excel hyperlink reference not updating when inserting rows
• excel formula not updating after inserting rows
• excel formula update insert row column
• google sheets convert abbreviation of month to number
• google sheets sort column by element frequency
• google sheets select item from split
• excel use offset in conditional formatting
• google sheets convert month to number
• google sheets sort column by item frequency
• google sheets select element after split
• excel conditional formatting outside of range
• google sheets stack columns
• google sheets stack columns vertically
• google sheets concatenate non blank cells from two columns
• google sheets select first n matches
• google query select first 10

• Elixir

• how to split string in elixir
• elixir random number
• elixir length of list
• for loop in elixir
• elixir string to time
• elixir string to datetime
• elixir string to date
• elixir try catch
• elixir try rescue

• ActionScript

• ModuleNotFoundError: No module named 'PySimpleGUI'
• TypeError: Cannot read property 'version' of undefined

• Delphi

• get current date delphi
• delphi basics generating random number
• delphi replace string
• length of string in delphi
• get last element of array delphi

• Scheme

• No authenticationScheme was specified, and there was no DefaultChallengeScheme found

• Perl

• perl http request
• perl replace substring
• perl foreach loop
• perl print an array
• perl for loop
• perl while loop
• perl slice array
• perl do while loop
• perl until loop
• perl exit loop
• perl post condition

• Objective-C

• get product image woocommerce
• uialertcontroller example objective c
• loop array objective c
• nstimer example objective c
• liquid null check

• Pascal

• pascal input number
• take console input in pascal
• store input in variable in pascal
• begin in pascal
• pascal pause program for seconds
• wait for input in pascal
• pascal press any key to continue
• delay() in Pascal
• wait in pascal
• pascal wait for key
• pascal halt program until any button is pressed
• pascal pause until key is pressed
• pascal exception handling
• pascal try catch finally
• pascal try except
• pascal input format check
• exceptions in pascal
• pascal error handling
• subrange variables pascal
• pascal cheat sheett

• Julia

• import csv in julia
• julia read csv dataframe
• julia hello world

• Groovy

• get date now groovy

• Solidity

• random function in solidity
• zero address solidity
• solidity concat strings
• solidity a to the power of b
• solidity power operator

• Smalltalk

• change s3 bucket name

• Erlang

• get erlang version
• tcp client erlang
• tcp server erlang

• Cobol

• python pygments install

• Fortran

• fortran int to string

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