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## Shell tips

It is easy to add autocompletion to commands in ksh, however they are limited because they have to be evaluated when the shell is starting.

In the following example, we can parse the file

    ~/.ssh/known_hosts

to get hostnames and use this list to set autocompletion entries for some commands:

    HOSTS_LIST=$(awk '{split($1,a,","); print a[1]}' ~/.ssh/known_hosts)
    set -A complete_ssh -- $HOSTS_LIST
    set -A complete_ping -- $HOSTS_LIST
    set -A complete_sndioctl_1 -- $(sndioctl | cut -d= -f 1)

In this other example, we autocomplete differently depending on the parameter position

    set -A complete_rclone_1 -- ncdu ls copy sync
    set -A complete_rclone_2 -- $(rclone listremotes)

Adding autocompletion entries is easy but in ksh it is evaluated at runtime, so you should avoid time consuming evaluations, and some commands like scp or git can't receive much useful completion.

More information can be found about this feature in the ksh man page.