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recent Unix learning

most: the pager sequence now goes more, less, most. most's big thing seems to be displaying multiple windows. It's also good on scrolling sideways, but I just found less is too, so I'm not sure there's a difference there. OTOH, I just learned less can scroll sideways.

rlwrap: applies a readline wrapper to interactive programs that don't use readline directly, like ocaml or 'perl -de 1'. If you use rlwrap -m, then ^^ summons an editor on your input.

man 7: there's a whole lots of odd information there.

.inputrc lines for better history:
"\e[A" history-search-backward
"\e[B" history-search-forward
searches (up-arrow) with what you typed so far as a prefix. There's also ^R, which you type first, followed by what you're looking for, and use ^R again to search other matches.

I recall that years ago, zsh searched on prefix. Then for a long time it had gone to only searching on the first word. I finally got the behavior I wanted back, though it's more involved.
(* edit: these lines don't actually work for me. I thought I did but I must have tested in a shell with the other ones already loaded, not in a fresh shell.
autoload -Uz up-line-or-beginning-search down-line-or-beginning-search
zle -N up-line-or-beginning-search
zle -N down-line-or-beginning-search
[[ -n "${key[Up]}" ]] && bindkey "${key[Up]}" up-line-or-beginning-search
[[ -n "${key[Down]}" ]] && bindkey "${key[Down]}" down-line-or-beginning-search

autoload -U history-search-end
zle -N history-beginning-search-backward-end history-search-end
zle -N history-beginning-search-forward-end history-search-end
bindkey "^[[A" history-beginning-search-backward-end
bindkey "^[[B" history-beginning-search-forward-end

I don't know the difference between the two, if anyway. The -end stuff in the second case is to make it move the cursor to the end; otherwise it just leaves it where you left it, which I hate.

zsh tricks:
ls > file1 > file2, or ls > file1 | file 2. Duplicates the output. More compact than messing with tee.

I just spent an embarrassing number of seconds trying to see if "ls | cat | cat" would "duplicate output", before I remembered what piping *does*.

You can set zsh options so tab completion lets you scroll around the choices. My mind is blown. I'm not sure what the minimal set needed is.
setopt auto_menu auto_list
seems like a good starting point. But I'd just re-started the configuration wizard and turned almost everything on and stuff started being cooler.

I played with the shell fish ("friendly interactive shell") again. I'll probably never leave zsh at this point, but fish does lots of neat things out of the box, vs. having to turn them on in zsh via research or going through the startup wizard. I think zsh's completions are more powerful, but it's a close race.

[Edit: hmm, I just found that for ocaml, zsh doesn't provide anything, but fish does. I'd guess fish is doing its parsing of man pages thing, rather than knowing about ocaml from installation.]

kill completions:
phoenix@mindstalk ~/zoot> kill 
1            (systemd)  1430           (bioset)  1985  (systemd-journal)
2           (kthreadd)  1431           (bioset)  1990          (kauditd)
3        (ksoftirqd/0)  1432           (bioset)  2155    (systemd-udevd)
5       (kworker/0:0H)  1466           (bioset)  3048            (crond)
…and 46 more rows

[mindstalk:0] kill 3360
 3360 pts/3    00:00:04 zsh                                                    
18729 pts/3    00:00:00 zsh                                                    
18730 pts/3    00:00:00 ps 

bash (with bash-completion package):
[phoenix@mindstalk zoot]$ kill 
Display all 151 possibilities? (y or n)
1      1422   1474   1499   15636  18739  2      3048   3337   491    779
10     1423   1477   1500   16300  18740  2155   3049   3338   5      780
10445  1424   1480   1501   16972  18741  23548  3050   3353   637    782

(and lots more PIDs).

As you can see, fish and zsh try to give you useful information, or at least a name. zsh seems limited to the tty process, which bash lists all the processes, regardless of whether you can kill them. fish also lists every process. No doubt zsh completion could be configured to do so as well. (I'd actually want just listing all of my processes, not like I can kill root ones.)

Likewise, bash's idea of command option completion is to just list them; the other two shells give descriptions. (What I really learned tonight was that bash does such advanced completion at all.)

sudo !!
A very old simple trick for when you try to do something but it needs sudo. If I'd known about !! I'd forgotten until today, though I knew about !num to get at a specific history command.

See the comment count unavailable DW comments at http://mindstalk.dreamwidth.org/457225.html#comments



Damien Sullivan

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