BASH: Substituting a variable inside a variable during echo -

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i explained question in comments:

var= ins="installing $var"  echo $ins    .           # in each echo command want dynamically substitute .           # $var variable in $ins variable. want echo $ins   # substitution of variable on echo command.

is possible?

you need function job gracefully.

say() {     echo "installing $ins" }  ins=hello  ins=world

or this:

say() {     echo "installing $@" }  hello  world

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