Tips
How to execute one command after another?
Execute multiple commands on one line
Windows CMD:
go build | try- &: separate multiple commands on one command line.
- &&: run the command following && only if the command preceding the symbol is successful.
mkdir -p newApp && cd newApp - ||: run the command following || only if the command preceding || fails.
For Powershell or Bash(semicolon):
go build; .\try.exe: Execute the first command, then second commandgo build; if ($?) {.\server.exe}: To execute the second command only if the first command is succeed
How to find the location of an executable file?
From command line:
G:\>where hugo
C:\Andrew\prg\bin\hugo.bat
From PowerShell:
PS C:\Andrew\prj\blog> Get-Command hugo
CommandType Name Version Source
----------- ---- ------- ------
Application hugo.bat 0.0.0.0 C:\Andrew\prg\bin\hugo.bat
How to change character encoding?
Beginning in PowerShell 5.1, the redirection operators (> and ») call the Out-File cmdlet, which is UTF-16 encoding by default. To change the encoding to UTF-8:
$PSDefaultParameterValues['Out-File:Encoding'] = 'utf8'
.\plan-b.exe | Out-File plan.txt -encoding utf8
How to get PowerShell version
> $PSVersionTable
Environment Variables
How to show environment variables?
Show all environment variables:
- PowerShell:
dir env: - CMD:
SET
Show one environment variable:
- PowerShell:
$Env:METRICSID - CMD:
SET METRICSID
How to set an environment variable?
PowerShell:
$Env:METRICSID = "MYID"$Env:METRICSID += "!"// MYID!$Env:PATH += ";C:\bin"
CMD:
SET METRICSID="MYID"// Only this sessionSETX METRICSID MYID// Global
How to save environment variable into a text file?
$Env:PATH >> path.txt
How to remove an environment variable?
Set the variable as empty string will remove it.
$Env:METRICSID = ""
How to display environment variables?
// dir and gci are both aliases for Get-ChildItem
// dir env:
PS > gci env: | where name -like 'METRICS*'
Name Value
---- -----
METRICSID CORPORATE\mynameid
METRICSPASSWORD MYPASSWORD