Make Firefox show the https:// bit of an Address

go to:

about:config 

make

browser.urlbar.trimURLs

false

How to fix a spelling mistake in lots of files

First, is it all version controlled? 
And are any of the files currently in editor buffers? Close if so.

There are two different versions of rename

the perl-rename that I was expecting

$ rename 's/monkey/reproducer/g' *monkey*

and the rename from util-linux 2.28.2 that's actually on my Fedora box

$ rename monkey reproducer *monkey*

need to do this in all affected directories, there's probably something you can do with find if there are lots

and then to change the text in all the files (recursive)

$ grep -rl monkey . | xargs sed -i 's/monkey/reproducer/g' 

finally change it in .bash_history too

sed -i 's/monkey/reproducer/g' ~/.bash_history

note that this will corrupt the history of all the commands you just typed.

rsync and explainshell

My current favourite rsync invocation is:

$ DIR=/home/jla/stuff

$ rsync -Phavz --stats remote:$DIR/  $DIR

and my current favourite way of figuring out what the options mean is:

http://explainshell.com/explain?cmd=rsync+-Phavz+--stats

http://explainshell.com/explain?cmd=rsync+-Phavz+--stats+remote%3A%24DIR%2F+%24DIR

Although it doesn't mention the crucial trailing slash on the source directory, which means that you end up copying /home/jla/stuff/file to /home/jla/stuff/file rather than to /home/jla/stuff/stuff/file.

passwordless ssh

* passwordless ssh
https://linuxconfig.org/passwordless-ssh

** make a key
ssh-keygen

** copy it to every machine you can log in to
as you
ssh-copy-id jla@furnace

or as root
ssh-copy-id root@manftest59

Emacs code folding

* Emacs code folding

http://stackoverflow.com/questions/1085170/how-to-achieve-code-folding-effects-in-emacs/1211325#1211325
https://emacs.wordpress.com/2007/01/16/quick-and-dirty-code-folding/

M-1 C-x $ and magic happens!

As usual, it’s white magic: C-x $ will bring your code back.

* hg merge not graphical avoid meld >>>>>>> <<<<< =====

* hg merge not graphical avoid meld >>>>>>> <<<<< =====
HGMERGE=merge hg rebase --keep --source ptm-eftest-source --dest origin/master

hg bisect

* hg bisect
https://www.mercurial-scm.org/repo/hg/help/bisect

** basic commands
hg bisect --reset
hg bisect --bad
hg bisect --good

** help is surprisingly readable
hg bisect --help
hg bisect --help --verbose

** automatic usage
hg bisect --reset
hg bisect --bad 34
hg bisect --good 12
hg bisect --command "make && make tests"