When man declare in bash, I get the manpage of declarein sql. But I would like to get the manage of declare in shell. How can I do that? Thanks~

I made a new partition for my home drive by following this guide: https://help.ubuntu.com/community/Partitioning/Home/Moving I have no idea what the fstab setting it suggests mean: "UUID=???????? /home ext3 nodev,nosuid 0 2 " I used an install CD and used "try it witho...

Here is a simple example showing that using declare in a script the script will not run, while sourcing the script will: $ cat /tmp/new #! /bin/sh declare -i hello $ chmod a+rwx /tmp/new $ /tmp/new /tmp/new: 3: declare: not found $ source /tmp/new $ I wonder why directly running the script d...

I like the "ambiance" theme in Ubuntu 11.04 better than the older "ambiance" theme in Ubuntu 10.04. I have one machine at work that I'm supposed to use the 10.04, and would like to 'update' the themes package. I tried temporarily adding the natty repository to grab the light-themes package, but...

Has anyone tried installing and optimizing boot-time with e4rat in Fedora 15? This ext4 defragmenting and optimizing utility works wonderfully in Debian. I am wondering if someone has replaced Fedora's native Readahead-fedora with e4rat and compared the results... Ref: Lifehacker's e4rat article

The following code best describes the situation.  Why is the last line not outputting the trailing newline char?  Each line's output is shown in the comment.  I'm using GNU bash, version 4.1.5 echo -n $'a\nb\n' |xxd -p # 610a620a x=$'a\nb\n' ; echo -n ...

I want to run "python ~/program/proxy.py" in terminal when boot up.And then hide this terminal window(because it is just a proxy program, and i don`t want to see the debug info).So how can i get it work.

I'm trying to install Virtualbox 4.1 from the .run file since Pacman had the 4.0 version only. But when I try installing the file using sh filelocation/filename.run, it gives me the following error- Please install the build and header files for your current Linux kernel. The current kernel ...

When playing audio CDs with mplayer, I always get a choppy playback. Playing audio from files, like MP3 (from any optical media, or other drives), etc. works fine. Watching video DVDs is also ok. Listening to uncompressed media that's on my hard drives, like WAV or CDR, works fine as well. But w...

Is there an openssl command to extract all certifacte subjects of a cacertfile (a file containing several certificates like /etc/ssl/certs/ca-certificates.crt)? I tried openssl x509 -in /etc/ssl/certs/ca-certificates.crt -noout -subject but it only gives me the subject of the first certificate.

I am having trouble thinking through how I can achieve my partitioning goals. Now my partitions are: sda1 (winA) (primary) sda2 (winB) (primary) sda3 (/ for linux) (primary) What I want to migrate into is (obviously partition numbers need not be exactly like that) sda1 (winA) (primary) sda...

As per the following example, and as in my recent question In bash, where has the trailing newline char gone?, I want to know "why" it happens x="$(echo -ne "a\nb\n")" ; echo -n "$x" | xxd -p # Output is: 610a62 # The trailing newline from the 'echo' command # has been "deleted" by Command...

I have set up a proxy server with SSL using a PEM certificate. Now, there is a couple of machines of mine that I would like to trust this certificate automatically (without the web browser complaining). How can I install a PEM certificate on each machine? Also, what is more recommended: generati...

I'm attempting to run fsck -p /dev/sda5 to repair errors on an ext4 partition, however the command outputs fsck from util-linux-ng 2.17.2 fsck.ext4: Device or resource busy while trying to open /dev/sda5 Filesystem mounted or opened exclusively by another program? I have confirmed using /etc/m...

Quoted from Wikipedia: By default, when a process is created it inherits a duplicate environment of its parent process, except for explicit changes made by the parent when it creates the child. At API level, these changes must be done between fork and exec. Alternatively, from shells su...

I've had quite a strange phenomenon with Xorg for some time now: After logging in to my laptop (specifics below) the cpu consumption of Xorg increases monotonically, even if the computer is idle and nobody sits in front of it. I measured the phenomenon over night+morning and got the following res...

I want to use the Cisco Easy VPN to connect to the OpSource cloud machines. When I open the app, it directly shows a certificate error message, I suspect that the certificate is not trusted from their domain because I tried it on a Windows machine and I had to add an exception for it. I am using...