$variable.md

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$ (Dollar sign prefix to a variable)

'$variable' The prefix '$' lets the shell interpret 'variable' as a variable.

$ echo $PATH
/home/username/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/mnt/c/Program Files (x86)

Useful Options / Examples

'MY_VAR="10"; echo $MY_VAR'

$ MY_VAR=10; echo $MY_VAR
10

Break it down

• MY_VAR has value 10, and '$' must be used to print this value.

'EXEC="./correct.out"; $EXEC'

$ EXEC="./correct.out"; $EXEC
correct output

Break it down

• The terminal replaces the $EXEC with its value, and reads it as if it was typed by the user. Therefore, the terminal runs the executable 'correct.out'.