Tricks and hints

Cyclo · 07-05-2003, 10:00 AM

Great feature of vim (heard there's something simliar in emacs) is folding, if you're a programmer.

You can collapse and expand sections of code you specify, handy if you have a function thats 300 lines long or something
works like this:
first, turn it on by typing ":set fdm=marker", then surround the bit you want to hide with:

//{{{ brief description here
whatever you want to hide
//}}}

also works with:
/*{{{ brief descriptinon */
whatever
/*}}}*/

to hide or close a section, type "zo" to open, "zc" to close

Azmeen · 07-07-2003, 03:21 AM

An often forgotten but useful command when it comes to log viewing is tac...

Basically it's cat in reverse...

Example:

Code:

tac /var/logs/messages | less

Is this contribution cool enuff?

JZL240I-U · 07-07-2003, 05:04 AM

Quote:

Originally posted by bulliver
Wow, what a cool thread. Thanks to whoever dug this one up...

Anyway, my little trick: All the gurus will know this one but it might be useful for the n00bs. In your .bashrc add:

Code:

alias ll='ls -l' # list long alias la='ls -a' # list all

and you don't have to type those annoying flags to get different list results. Of course you can do this with any command you fancy.

I don't want to throttle your zest ...

But: at least in SuSE 8.1 this is a built-in feature, including color-coding. There is some use for newbie-friendly distributions after all ...

unSpawn · 07-08-2003, 05:32 PM

Originally posted by Cyclo
Great feature of vim (..)

...and for using Vi as outliner also see http://www.vim.org/scripts/script.php?script_id=517 and http://www.troubleshooters.com/linux/olvim.htm

unSpawn · 07-08-2003, 05:36 PM

Renice running script from inside.
Call as "reniceSelf <(+|-)value>".
Defaults to +15 if no value given.

function reniceSelf () { # Renice running script
n="$1"; renice "${n:=+15}" -p $$ >/dev/null 2>&1; unset n; }

Allen614 · 07-08-2003, 05:56 PM

This is a simple script using expect that opens any file manager in su mode ala KDE's version.

#!/usr/bin/expect

spawn "su"
expect -re "Password:"
send "rootpassword\r"
expect -re "#"
send "nohup program\r"
expect -re "#"
wait

tcaptain · 07-09-2003, 11:17 AM

Quote:

Originally posted by Allen614
This is a simple script using expect that opens any file manager in su mode ala KDE's version.

#!/usr/bin/expect

spawn "su"
expect -re "Password:"
send "rootpassword\r"
expect -re "#"
send "nohup program\r"
expect -re "#"
wait

Wouldn't that leave your root password out in the open tho?

Allen614 · 07-09-2003, 05:24 PM

It would. You could rewrite it to prompt for the password if it's a concern.

unSpawn · 07-09-2003, 05:27 PM

It would. You could rewrite it to prompt for the password if it's a concern.
Since it's the *root* password *and* in cleartext, I'd say that classifies it as a major concern right away.

unSpawn · 07-10-2003, 07:39 AM

Here's an example showing how you can control what to load from the LILO bootprompt.
Now having a bootprompt commandline like
boot: linux loadusb disableswap lockgcc
*could* ./make sense.

MasterC · 07-19-2003, 04:05 AM

Quote:

Originally posted by Azmeen
An often forgotten but useful command when it comes to log viewing is tac...

Basically it's cat in reverse...

Example:

Code:

tac /var/logs/messages | less

Is this contribution cool enuff?

Excellent tip! I've always wished something like this was available! I've often used tail but it quite more oftenly was not enough, I wanted more than 8 lines.

Cool

slakmagik · 07-19-2003, 04:17 AM

tail -20 foo.log

or however many lines you want. Or am I missing something?

But, true, that's still in order - tac is cool for giving you the last first.

MasterC · 07-19-2003, 09:10 AM

Thanks

I guess since I was using tail and wasn't pleased with it's default use, I should have read the manpage eh?

Cool

slakmagik · 07-19-2003, 06:52 PM

Well, there's just so many apps with so many man pages with so many switches it's hard to find them all. I've found about .000002 of the ones I want.

unSpawn · 07-20-2003, 07:54 AM

Will display files and md5sums for an installed rpm package.
Save as "rpm-contentsof-file+md5" or any name you like and make executable.
Needs access to the rpm database so only runs as root.

The Bash script is in this thread.