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A much shorter version of this command.
This command does the following:
- converts any sequence of multiple spaces/tabs to one space only
- completely removes any space(s)/tab(s) at the end of each line
(If spaces and tabs are mixed in a sequence i.e. [tab][tab][space][tab], you have to execute this command twice!)
Given some images (jpg or other supported formats) in input, you obtain a single PDF file with an image for every page.
If you need to create a profile and are already running Firefox, you don't need to close it to do it. Also, if you don't know the exact name of the profile, this would allow you to pick from a list.
and creating several different profiles, use this command to run multiple Firefox profiles simultaneously.
I needed a way to search all files in a web directory that contained a certain string, and replace that string with another string. In the example, I am searching for "askapache" and replacing that string with "htaccess". I wanted this to happen as a cron job, and it was important that this happened as fast as possible while at the same time not hogging the CPU since the machine is a server.
So this script uses the nice command to run the sh shell with the command, which makes the whole thing run with priority 19, meaning it won't hog CPU processing. And the -P5 option to the xargs command means it will run 5 separate grep and sed processes simultaneously, so this is much much faster than running a single grep or sed. You may want to do -P0 which is unlimited if you aren't worried about too many processes or if you don't have to deal with process killers in the bg.
Also, the -m1 command to grep means stop grepping this file for matches after the first match, which also saves time.
dsh - Distributed shell, or dancer?s shell ;-)
you can put your servers into /etc/dsh/machines.list than you don't have to serperate them by commata or group them in different files and only run commands for this groups
dsh -M -c -a -- "apt-get update"
Yeah, there are many ways to do that.
Doing with sed by using a for loop is my favourite, because these are two basic things in all *nix environments. Sed by default does not allow to save the output in the same files so we'll use mv to do that in batch along with the sed.