Here is a nice link on BASH History Expansion. There are lot of examples in this page and some of them might be quite useful. But here are my list of favourites:
!!
This is probably the most used one by me. This will repeat the last command. And this works even in conjunction with other commands like
Continue readingHere are one sql script that I found some time back. This will be listing the top 5 SQL queries in Oracle.
SET linesize 300
SET PAGESIZE 200
select *
from
(select sql_text,
sql_id,
elapsed_time,
cpu_time,
user_io_wait_time
from sys.v_$sqlarea
order by 5 desc)
where rownum < 6;
quit;
If you ever wondered what combination of some colors would look like but did not really feel like setting them in your xterm just to check them out. Or if you wanted to know about all the colors on you X window system then you can install this utility called xcolorsel.
][1]You will need to setup the rpm-shere repo for this.
Continue readingYou would have used top at some point of time. Did you not wish that instead of just the processes it list all the vital statistics of the system as a whole. How good it would be to see the Memory, Net, Processes and Disk usage on the same screen. Well then you should take a look at glances. Here is how it looks:
][1]For using this tool, here is what you need to do :
Continue readingThere is a small nifty utility called xmlwf that can check your xml documents to see if they are well formed.
sudo yum install expat
Once installed, simply use :
xmlwf
Need more details, just check the man page 🙂
Well, you would already have some themes for your vim, by default. And if you did not like them then you would have added some of your own too (downloaded from vim.org). But, those are something, that you might not still like and want to make some changes.
Here’s, a new way to do it. Just go to the link mentioned below and click on Generate Dark or Generate Light. You can generate as many as you like and once you like the theme, simply click on vim in the bottom and download 🙂 BTW, you can generate textmate and Emacs theme as well.
Continue readingThere are some commands that take file name and there are some case where you need to give file name. But there are some cases where you want to modify the file before passing it to the command. What do you do in these case’s?
I had a file containing huge amount of data and for some testing I wanted to pass only the first few lines of the file and not the complete file. And since the file only accepted filename and would not take any input from the STDIN so only option was to create a file with the required data in a temporary file. So, I sat back to figure out some way to do it and finally found I can use this:
Continue reading