Pipe stdout into sed to modify.

E.g. when updating occurrences of ${OLD_VERSION} in $PATH into ${NEW_VERSION} (disclaimer: untested):

export PATH=`echo $PATH | sed "s/\(.*\)${OLD_VERSION}\(.*\)/\1${NEW_VERSION}\2/g"`

Tip:

• Use double quotes for sed if you need to use Bash variables inside the command.

References:

• https://unix.stackexchange.com/questions/113515/how-to-modify-output-in-bash-command-pipeline
• https://askubuntu.com/questions/76808/how-do-i-use-variables-in-a-sed-command