Template Generation

Placeholder Replace

Fill One Slot

A small template can use a visible placeholder that the script replaces with a selected value. This keeps the fixed text separate from the changing value.

Program

Play the script to choose the deployment target and see the template filled in.

placeholder_replace.sh 
#!/usr/bin/env bash

target=
template="deploy __TARGET__"
command="${template/__TARGET__/$target}"
echo "$command"

#!/usr/bin/env bash

target=
template="deploy __TARGET__"
command="${template/__TARGET__/$target}"
echo "$command"
placeholder A placeholder marks the part of a template that will change.
parameter substitution `${text/pattern/value}` replaces the first matching pattern in a string.
template boundary Keeping fixed text in `template` makes the changing value easier to review.