Sort with uniq comma separated items with POSIX utils.

Suppose you have string:

str="item4, item2, item3, item2, ..."

and want alphabetically sort items in shell script.

Sort and uniquify lines in Emacs.

For only sort lines exist built-in func: C-x sort-lines.

Sort and uniquify lines:

• select region
• C-u M-| sort -u RET

With transient-mark-mode and delete-selection-mode enabled:

• select region
• M-| sort -u RET

to replace selection with sorted and uniquified lines.