simple (fish) shell script to execute a command via an X dialog box

x-shell-command

#!/bin/fish

set -l histfile ~/.x-shell-command-history

set -l lastcmd ""

if test -f $histfile
    set lastcmd (cat $histfile)
end

if set -l command (zenity --entry --entry-text="$lastcmd" --text="Command to execute:" --title="x-shell-command")
    set -l output (eval $command)
    if test $status -eq 0
        if test -n "$output"
            zenity --info --text="$output"
        end
    else
        zenity --error --text="$output"
    end

    echo "$command" >$histfile
end