[solved] Running a command in background (bash script)

Salut,
as netcfg2 does not work with my wireless connection, I have to set up the connection manually. For not having to type in the commands every time, I created a bash script.
#!/bin/bash
iwconfig wlan0 mode managed essid mynetwork channel 6
ifconfig wlan0 up
wpa_supplicant -D wext -i wlan0 -c /etc/wpa_supplicant.conf -dddd &
dhcpd wlan0
This works fine till the wpa_supplicant line. wpa_supplicant is not started in the background (as I thought, the ampersand at the end of the line would.
So how can I get wpa_supplicant run in the background?
Thanks in advance,
Stefan
Last edited by vbtricks (2008-05-11 09:13:36)

Ramses de Norre wrote:How do you know it isn't? What exactly does happen?
The script does not return to the user-prompt. Is an ampersand at the end of the line the correct solution, or are you unsure yourself?
bender02 wrote:On thing is that even if it starts, it does take it a couple of seconds to connect, so it's probably not very good to run dhcpcd right after wpa_supplicant. Another thing is that you probably have a typo up there, shouldn't it be 'dhcpcd' instead of 'dhcpd'?
Well, as the wpa_supplication command is not really run in the background the script did never execute the dhcpcd command. After having solved the above, correcting the spell-mistake will be a smaller problem. Even calling the dhcpcd command myself would be no unworkable way, the open root-shell (as I have to use another as the one calling the script is blocked) is a far greater problem...

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jasonwryan wrote:Presumably the script is called gmail.py, not gmail1.py?
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[SOLVED] FFMPEG appears to be trashing bash script variables

Hi,
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stream #1:
keyframe=1
duration=0.023
dts=355.033 pts=355.033
size=252
Swiftly followed by:
00000000 21 0a 4f ff ff e0 3f fe a2 c6 b1 41 31 a0 88 41 !.O...?....A1..A
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00000030 94 98 ca a8 03 34 aa bf 04 51 38 12 c9 43 80 62 .....4...Q8..C.b
00000040 5b 16 94 99 20 18 9e cd 55 d0 6c 15 38 13 ce cc [... ...U.l.8...
00000050 d4 2e 80 3b 10 e9 07 70 bc 23 8c 8c 84 96 8a 38 ...;...p.#.....8
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00000090 2a c4 13 49 61 50 b7 d0 3c 1e 2b 4b 90 c4 32 ae *..IaP..<.+K..2.
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Last edited by jwm-art (2014-05-27 21:39:39)

Self contained example:
#!/bin/bash
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if test $? -eq 0; then
echo "Ok"
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echo "FAIL"
echo "Aborting..."
exit
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done <<YT_URLS
https://www.youtube.com/watch?v=XqdYnxv01yM
https://www.youtube.com/watch?v=lX_o5t2YoUE
https://www.youtube.com/watch?v=V9sI6VEDE5M
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Parse error, at least 3 arguments were expected, only 1 given in string 'osmo_Dibs_-_Xultation-V9sI6VEDE5M.mp4'
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error parsing debug value
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19212 frames successfully decoded, 0 decoding errors
[AVIOContext @ 0xd9ff60] Statistics: 2 seeks, 17081 writeouts
[AVIOContext @ 0xc77200] Statistics: 7082450 bytes read, 176 seeks
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Last edited by jwm-art (2014-05-27 20:17:57)

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sweetthdevil wrote:ffmpeg -s 2720x1024 -r 25 -f x11grab -i :0.0 -acodec libmp3lame -ab 128k -vcodec mpeg4 -sameq -y -t 60 /media/z/.cam/screen/screen_`date +%F_%T`.avi
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Hello:
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Hi j.v.,
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PowerMac G4 Mac OS X (10.4.5)

Bash script run via cron not executing MYSQL command

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[SOLVED] problem with spaces and ls command in bash script

I am going mad with a bash script I am trying to finish. The ls command is driving me mad with spaces in path names. This is the portion of my script that is giving me trouble:
HOMEDIR="/home/panos/Web Site"
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Last edited by panosk (2009-11-08 21:55:31)

oops, brain fart. *flushes with embarrassment*
-- Edit --
BTW, for this kind of thing, I usually do something like:
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The later method is useful when elements of "${files[@]}" will be used multiple times across the script.
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ganesh_mak wrote:
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Do you think I used the '-i' argument just for fun? Did you do a 'man sh' and 'man bash' to see what the arguments do? If not then do it now.
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Dear Fellow Archies!
I use the command
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Here's the script:
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Last edited by UFOKatarn (2012-05-03 07:38:28)

Done! Working!
Geniuz: Logout-login did it. How simple.
Juster: I added "echo $PATH" to the script and ran it with "bash -x". And the output was the same as after the logout-login. Here it is, in case you are curious.
/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/usr/bin/core_perl:/opt/qt/bin
Thank you all for your help guys :bow:.
OFFTOPIC:
All who intend to use Xfce launchers to run bash scripts: There are two options in the settings for each launcher: "Command" and "Working Directory". And when I had "Working Directory" filled with "/home/username/", the script didn't work. It worked perfectly after I blanked out the "Working Directory" option. Just so you know, in case someone doesn't .
This has never happened to be before, but still, I guess it is better to do it with blank "Working Directory" and entering the entire path into the script in the "Command" field. It might be that Xfce launchers always stick to the "Working Directory", even though a script might tell them otherwise.
Last edited by UFOKatarn (2012-05-03 07:38:05)

Sudo Command in Bash Script

So I created a simple bash script to run on login.....
one of the commands is the following:
sudo "something something something"....
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Thanks ahead of time on this really dumb question.

There's a few ways to do this. Here's two (pick the method you like):
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Use visudo to add the following line to the sudoers file:
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This might work too (assuming SUDO_ASKPASS has been previously exported):
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Hello,
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Sorry, for being not precise.
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I know how to autostart in xfce and so created an autostart entry but unfortunatly it doesn't work for my "special" command.
What I did:
1. I wrote a script (first post) and tried to autostart it in xfce. For that command I created an entry in sudoers in order to avoid enter root passwort. The script didn't start.
Then...
2. I created an autostart entry (deleted the first one - see point 1) and entered the whole command (cat .../event1 >> $home...) in the xfce autostart input window. The idea was to run the command directly and not through a script. But it didn't work.
Therefore I tried to run alter the command to "bash cat .../event1 >> $home ...." Didn't work either.
3. I also deleted the autostart entry no 2. and created the alias in .bashrc in my home directory. Now created a new autostart entry trying to start the alias. Didn't work.
I also tried to set the Terminal option in the file $home/.config/autostart/log.desktop to "true".
So it looked like this:
[Desktop Entry]
Encoding=UTF-8
Version=0.9.4
Type=Application
Name=log
Comment=event1
Exec= sudo cat /dev/input/event1 >> /home/tom/.cblog/log.bin &
StartupNotify=false
Terminal=true
Hidden=false
The alias for example works well if I enter it in xterm.
So, I don't know why it isn't working! :-(
Thank you for any help
Clementis

Unexpected token `(' in my bash script [Solved]

I've been working on a bash script, and I'm trying to get it to move all directories that are not named certain names to another directory.
EDIT: Fixed the thing papajoke pointed out
#!/bin/bash
mv ~/Downloads/!(folders|pics|docs|code|archives|vids|sounds)/ ~/Downloads/folders/
The command from the script does what I want it to do when I run it from a terminal.
It also works if I run the script as follows:
source script.sh
It doesn't work like this:
bash script.sh
I'm trying to get it to run when I login, and using the running the command with "source" in my MATE Startup Applications doesn't work.
I'm new to bash scripting, any help would be much appreciated. Thanks
Last edited by physicsshark (2015-04-07 20:09:07)

Trilby wrote:I've never seen that syntax
You mean the pipes or the bang?
$ touch a.gz b.gz c.txt
$ ls !(*.gz)
c.txt
This works as an alias and from the comeliness commandline, but not in a script.
$ ls -l ~/2
total 16
drwxr-xr-x 2 karol users 4096 Apr 7 03:13 a
drwxr-xr-x 2 karol users 4096 Apr 7 03:07 b
drwxr-xr-x 2 karol users 4096 Apr 7 03:07 c
drwxr-xr-x 2 karol users 4096 Apr 7 03:13 d
$ mv ~/2/!(a|b|c) ~/2/a
$ ls -l ~/2
total 12
drwxr-xr-x 3 karol users 4096 Apr 7 03:14 a
drwxr-xr-x 2 karol users 4096 Apr 7 03:07 b
drwxr-xr-x 2 karol users 4096 Apr 7 03:07 c
$ ls -l ~/2/a
total 4
drwxr-xr-x 2 karol users 4096 Apr 7 03:13 d
Last edited by karol (2015-04-07 01:20:14)

[solved] Running a command in background (bash script)

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