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lang-bash
x=1. - All the variants you mention make use of side effects of a variable expansion; they have there uses, and it seems you've got answers that explain the differences.echo $xafter each of those and you will see if it actually assigns anything to the variable. This syntax is actually for reading (expanding) the variable (with side-effects, which may also modify the variable, but not in all the cases you mentioned).x=1,let x=1,((x=1)),read x <<< 1,eval x=1, and probably others.