user784637's questions

I have a repository on a ubuntu 12.04 server that is serving .deb files for only 64 bit architectures.

When I run apt-get update I get the following

W: Failed to fetch https://test.com/repo/dists/precise/Release Unable to find expected entry 'main/binary-i386/Packages' in Release file (Wrong sources.list entry or malformed file)

I'm using reprepro to add the .deb files to the repository

reprepro -Vb . includedeb precise package_amd64.deb

And in my distributions file /var/www/site/repo/conf/distributions I am only specifying amd64 bit architectures.

Origin: apt.site.com
Label: apt repository
Codename: precise
Architectures: amd64 source
Components: main
Description: debian package repo
SignWith: yes
Pull: precise

I circumvent the error by having my sources.list file include an entry that includes [arch=amd64]

deb [arch=amd64] https://apt.site.com/repo precise main

However I would like to avoid having to specify that in my sources.list file. Is there anything I can configure on the repository to tell clients trying to pull files from the repo that they should only expect .deb files compiled for amd64 architectures?

I have a rather large file (~50GB) and it takes some time to run

tar xvf file.tar.bz2

on it. I'm aware of programs that can do parallel compression for bzip2 files but unaware of programs that can do parallel decompression for bzip2 files.

Are there any programs that can achieve this? What is the exact syntax of the command to use to extract from the file?

I'm using ubuntu 12.04

Is there a difference between

kill -9 212121

and

kill 212121

If I have turned off execute permissions on hello.sh and try to execute it

~$ sudo chmod 0666 hello.sh
~$ ./hello.sh
-bash: ./hello.sh: Permission denied

I get the permission error. But I can easily override that by using the . or source builtin.

$ . hello.sh
hello everyone

What's the purpose of setting the execute permission on a file if someone can override it using the source builtin?

hello.sh

#!/bin/bash
echo 'hello everyone'

Some parts of wikipedia appear differently when you're logged in. I would like to wget user pages so they would appear as if I was logged in.

Is there a way I can wget user pages like this

http://en.wikipedia.org/wiki/User:A

this is the login page:

http://en.wikipedia.org/w/index.php?title=Special:UserLogin&returnto=Login&campaign=ACP3

I'm having trouble with the current release of ffmpeg, it transcodes .mp3 to .wavs in a format that is unsupported by my client.

How can install this version?

ffmpeg version 0.7.3-4:0.7.3-0ubuntu0.11.10.1, Copyright (c) 2000-2011 the Libav developers
  built on Jan  4 2012 16:08:51 with gcc 4.6.1

EDIT

The problem I am trying to resolve is transcoding an .mp3 to .wav. Our client has an identification service that determines a song from the .wav. When I pass the .wav that ffmpeg has generated

exec ("ffmpeg -ss $start -t $duration -i $shellArgSongPath -f wav -ar 44100 somefile.wav");

I receive an "Audio format not supported"

My guess is that the default codec used to transcode from .mp3 to .wav has changed. Would anyone happen to know what that was in the previous version?

EDIT

(Reading database ... 31284 files and directories currently installed.)
Preparing to replace ffmpeg 4:0.7.3-0ubuntu0.11.10.1 (using ffmpeg_0.7.3-0ubuntu0.11.10.1_amd64.deb) ...
Unpacking replacement ffmpeg ...
Replaced by files in installed package libav-tools ...
dpkg: dependency problems prevent configuration of ffmpeg:
 ffmpeg depends on libavcodec53 (<< 4:0.7.3-99) | libavcodec-extra-53 (<< 4:0.7.3.99); however:
  Version of libavcodec53 on system is 4:0.8.1-0ubuntu1.
  Package libavcodec-extra-53 is not installed.
 ffmpeg depends on libavdevice53 (<< 4:0.7.3-99) | libavdevice-extra-53 (<< 4:0.7.3.99); however:
  Version of libavdevice53 on system is 4:0.8.1-0ubuntu1.
  Package libavdevice-extra-53 is not installed.
 ffmpeg depends on libavfilter2 (<< 4:0.7.3-99) | libavfilter-extra-2 (<< 4:0.7.3.99); however:
  Version of libavfilter2 on system is 4:0.8.1-0ubuntu1.
  Package libavfilter-extra-2 is not installed.
 ffmpeg depends on libavformat53 (<< 4:0.7.3-99) | libavformat-extra-53 (<< 4:0.7.3.99); however:
  Version of libavformat53 on system is 4:0.8.1-0ubuntu1.
  Package libavformat-extra-53 is not installed.
 ffmpeg depends on libavutil51 (<< 4:0.7.3-99) | libavutil-extra-51 (<< 4:0.7.3.99); however:
  Version of libavutil51 on system is 4:0.8.1-0ubuntu1.
  Package libavutil-extra-51 is not installed.
 ffmpeg depends on libpostproc52 (<< 4:0.7.3-99) | libpostproc-extra-52 (<< 4:0.7.3.99); however:
  Version of libpostproc52 on system is 4:0.8.1-0ubuntu1.
  Package libpostproc-extra-52 is not installed.
 ffmpeg depends on libswscale2 (<< 4:0.7.3-99) | libswscale-extra-2 (<< 4:0.7.3.99); however:
  Version of libswscale2 on system is 4:0.8.1-0ubuntu1.
  Package libswscale-extra-2 is not installed.
 libav-tools (4:0.8.1-0ubuntu1) breaks ffmpeg (<< 4:0.8~) and is installed.
  Version of ffmpeg to be configured is 4:0.7.3-0ubuntu0.11.10.1.
dpkg: error processing ffmpeg (--install):
 dependency problems - leaving unconfigured
Processing triggers for man-db ...
Errors were encountered while processing:
 ffmpeg

EDIT Output when I run ffmpeg command from the server that produces the well-formed .wav

ffmpeg version 0.7.3-4:0.7.3-0ubuntu0.11.10.1, Copyright (c) 2000-2011 the Libav developers
  built on Jan  4 2012 16:08:51 with gcc 4.6.1
  configuration: --extra-version='4:0.7.3-0ubuntu0.11.10.1' --arch=amd64 --prefix=/usr --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static
  libavutil    51.  7. 0 / 51.  7. 0
  libavcodec   53.  6. 0 / 53.  6. 0
  libavformat  53.  3. 0 / 53.  3. 0
  libavdevice  53.  0. 0 / 53.  0. 0
  libavfilter   2.  4. 0 /  2.  4. 0
  libswscale    2.  0. 0 /  2.  0. 0
  libpostproc  52.  0. 0 / 52.  0. 0
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

Use -h to get full help or, even better, run 'man ffmpeg'

Output from when I run ffmpeg command from server that produces ill-formed .wav

ffmpeg version 0.8.1-4:0.8.1-0ubuntu1, Copyright (c) 2000-2011 the Libav developers
  built on Mar 22 2012 05:09:06 with gcc 4.6.3
This program is not developed anymore and is only provided for compatibility. Use avconv instead (see Changelog for the list of incompatible changes).
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

Use -h to get full help or, even better, run 'man ffmpeg'

Possible Duplicate:
sudo tar cvpzf exiting with failure due to previous error

When I run the command

tar -cvfz backup.tar.gz somedirectory

I get the following sterr

tar: Exiting with failure status due to previous errors

However when I omit the preceding hyphen from -cvfz everything seems to work just fine. Is there a known reason for why the hyphen is preventing me from tar'ing my files?

When I run the ls -l command I get details about the files in the current directory like permissions, owner, group, file size.

Is there a way I can get these same details instead of just the location of the file when I run locate?

I'm trying to put a linux distro .iso on my usb and the instructions suggests using the following command to make a fat32 filesystem:

mkdosfs -F 32 /dev/sdc1

Is there a reason this command is to be used instead of mkfs?

What are the technical differences between the two? The only thing I noticed is that

sudo su

requires you to enter your own password (assuming you're not root)

While

su root

requires you to enter root's password. However both seem to log you into the root user account.

$ set frog pets
$ echo $1_$2
frog_pets

man set is not bringing me anything =( neither is which set or whereis set

The output of

# ls

and

# echo $(ls)

are the same. What exactly does the $ sign and the parenthesis mean?

Also, what is going on a technical level that causes the output of these two commands to be the same?

Sorry this is a little embarassing but I'm trying to set up my own server for the first time. I found great tutorial online.

http://www.intac.net/build-your-own-server/

I'm stuck at the 2nd to last line of step 4. Apparently there is no samba directory in init.d.

Why isn't there a samba directory in init.d?

Would the following work?

# sudo restart smbd
# sudo restart nmdb

Possible Duplicate:
Location of file folders of installed programs

For example the following are the same

# /usr/bin/php updateDatabase.php

# php updateDatabase.php

But how would I infer the location of the php command to be in /usr/bin?

Is there a command to remove all files and subdirectories in a directory without deleting the directory?

For example if I have directory dontDeleteMe with subdirectories 1, 2, 3 and each subdirectory has a few pictures in it, how can I remove the subdirectories 1, 2, and 3 and all the files in the them, without removing the parent directory dontDeleteMe?

The closest I've gotten is

# rm /path/to/directory/*.*

but that doesn't work for files that don't have an extension...

Files from my external hard drive are no longer indexed after rebooting. I have to remount and then run

# updatedb

after each reboot. The problem is updatedb takes a few minutes for my external hard drives. Is there any way I can retain indexing for my externals after I reboot so that the locate command can search through my externals?

EDIT: Per Request here are my specs:

$ cat /etc/updatedb.conf
PRUNE_BIND_MOUNTS="yes"
# PRUNENAMES=".git .bzr .hg .svn"
PRUNEPATHS="/tmp /var/spool /media"
PRUNEFS="NFS nfs nfs4 rpc_pipefs afs binfmt_misc proc smbfs autofs iso9660 ncpfs coda devpts ftpfs devfs mfs shfs sysfs cifs lustre_lite tmpfs usbfs udf fuse.glusterfs fuse.sshfs ecryptfs fusesmb devtmpfs"

# mount
/dev/sda5 on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw,noexec,nosuid,nodev)
none on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
none on /dev type devtmpfs (rw,mode=0755)
none on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
none on /dev/shm type tmpfs (rw,nosuid,nodev)
none on /var/run type tmpfs (rw,nosuid,mode=0755)
none on /var/lock type tmpfs (rw,noexec,nosuid,nodev)
none on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)
gvfs-fuse-daemon on /home/me/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,user=me)
/dev/sdb1 on /media/me type fuseblk (rw,nosuid,nodev,allow_other,blksize=4096,default_permissions)
/dev/sdd1 on /media/Little Boy type fuseblk (rw,nosuid,nodev,allow_other,blksize=4096,default_permissions)
/dev/sde1 on /media/Fat Man type fuseblk (rw,nosuid,nodev,allow_other,blksize=4096,default_permissions)

# on_ac_power; echo $?
255

In the readline manual

# man readline

The following describes how to search backward and forward.

reverse-search-history (C-r)
Search backward starting at the current line and moving `up' through the history as necessary.  This is an incremental search.

forward-search-history (C-s)
Search forward starting at the current line and moving `down' through the  history  as  necessary.   This  is  an  incremental search.

When I hit ctrl+r and type "apt-get", I'm able to do a reverse-search-history by continually tapping ctrl+r. But then I tap ctrl+s and the terminal does not go forwards. Am I doing something incorrect?

Also what key does the Meta prefix "M-" represent?

Let's say you wanted to search the documentation for mplayer:

# man mplayer

To search for "length" you would type "/length" while in man and press enter. To go to the next occurrence of "length" you would type "n". What is the hotkey to get to the previous occurrence of "n"?

And what are the hotkeys to get to the next and previous occurrences of a search term in info?

# info mplayer

I'm writing a very simple browser based MP3 player in PHP. Part of this project requires that every MP3 file is converted to a WAV file. There's a function in PHP called shell_exec that allows you to execute a command via the shell. For my project, whenever someone uploads a song to their account, the following command would be executed:

shell_exec('ffmpeg -i inputSong.mp3 outputSong.wav')

So let's say there are 10 different people who finish uploading a song at the same exact time. Does the Linux server execute 10 shell commands simultaneously or does it only do one at a time?

If a server can handle multiple shell commands simultaneously, would the server be able to handle converting 10 different songs at the same time or does it only do one at a time?