Lately I've been running quite a lot of commands that take long time, and was wondering how long they took. Of course I can use the standard time program, but it doesn't show me how long it already took.
So, figured I can write it myself. Result:
You can download it, as always, from shell_utils git repo.
Hope you'll find it useful 🙂
Recently we had interesting problem. There are some maintenance tools, that do stuff that touch database. One can be calling repack, another can be specific dump, and yet another can be applying migrations from application.
The problem is that they can step over each other toes, and cause issues.
So we needed to add some way to prevent them from running at the same time…
In my work I'm often in situation where I want to restart remote server, and then immediately connect to it over ssh.
This can be done by repeating ssh HOST in shell, but it gets tedious.
Recently, on irc, there have been some talks with people using various pg_dump/pg_dumpall calls to get dumps of database.
I voiced my ideas, but figured it could be good subject for a blog post.
Continue reading How to efficiently dump PostgreSQL databases
Recently I've seen case like:
Why? How to avoid the problem?
Continue reading How to run short ALTER TABLE without long locking concurrent queries
I assume most of you are familiar with watch program. If not – it shows, periodically, output of a command.
I was missing similar functionality for tmux, especially when I have multiple windows/panes.
So I wrote tmux_watch_many.
How to use it?
Continue reading New shell_util to watch output in multiple tmux panes at once
I am doing quite a lot of work inside tmux. I especially love that I can start multiple windows/panes and use them to run the same thing across multiple servers, while still having normal shell access between steps.
This thing was greatly improved when I wrote tmux_send_to_many, but one thing was missing – waiting for the thing, running in tmux window to end.
Generally, I had to look at all the windows, and decide when to launch next step on my own.
Not anymore.
I wrote previously about tmux_send_to_many and group_by shell tools that I authored.
Since then I got some more ideas for changes, and for new tool, so figured I'll make an honest git repo for it. Repo is on GitLab, and all the tools inside can be freely used.
While I was doing it, I fixed some things in tmux_send_to_many.
And then – I remembered that for long time I was missing “visual-sleep" type of tool. One that will show some progress information while it's working.
Enter vsleep.
Continue reading visual sleep in shell, and shell_utils repo information
I assume that everyone reading my blog understands GROUP BY clause in SQL.
Lately I've been doing some maintenance work, and found myself in a position that I could really use similar thing in shell.