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This command has an empty output.
su user -c "ABC=abc;echo $ABC"
Any idea, how can I define a variable in the input command?
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To set (or change) a environment variable, use command " set varname=value ". There shall be no spaces before and after the '=' sign. To unset an environment variable, use " set varname= ", i.e., set it to an empty string.
On the Windows taskbar, right-click the Windows icon and select System. In the Settings window, under Related Settings, click Advanced system settings. On the Advanced tab, click Environment Variables. Click New to create a new environment variable.
The easiest way to set environment variables in Bash is to use the “export” keyword followed by the variable name, an equal sign and the value to be assigned to the environment variable.
The export command is used to set Environment variables. Environment Variables created in this way are available only in the current session.
Change your quotes to single quotes. The double quotes allow the variable to be substituted in the current environment where it's not set yet. To see the difference, try your version with $USER and compare it to this one:
su user -c 'ABC=abc; echo $ABC; echo $USER'
If using a bourne shell variant:
ABC=abc su user -c 'echo $ABC'
If not, use env.
env ABC=abc su user -c 'echo $ABC'
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