Programming :: What The Dot (.) Infront Of The Command Or Script
Jan 16, 2011
Anyway, just wanting to know if someone can please explain what the dot (.) infront of the command or script does and why it works and does not work in the following?
Code:
I did a which db01env and it says it is not found even though /u02/bin/oracle is included in the PATH environment variable. I believe this is because db01env is not executable and the which command only checks for executables, is that a correct assumption/guess?
Am not having issues at the moment but just curious how a single dot could make such a big difference that it can make or break stuff.
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Mar 9, 2011
I am trying to setup a firewall using Centos 5.5. The machine has 2 NICs, one connecting to the ISP/Modem and the other connected to a DIR-655 wireless router. The nic is connecting to the internet port on the router.
I do not want DHCP on the Firewall machine but on the wireless router.
[ISP/Modem]<--->[machine eth0]<--->[machine eht1]<--->[DIR-655 internet port]
IP from ISP Dynamic 192.168.1.1 192.168.1.2
IP's on the DIR-655 LAN will be 124.168.0.0/24 network lets say.
I have setup routes on the eth0 192.168.0.0/24 and 124.168.0.0/24
and added 124.168.0.0/24 to eth1.
I can ping eth0 and eth1 but cannot ping 192.168.1.2.
this setup is not actually connected to the internet so I disabled iptables to try testing the ping and still no good.
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Jul 3, 2011
I have a rocketfish RF-NBCAM webccam but it doesnt seem to work as it should be, the image is dark and the blue light infront of it that helps with low light enviroments is not working. i have found some drivers for other ubuntu distros but i have the dependencies trouble.
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Jun 18, 2010
Code: cmd='date | wc'
$cmd If this script is executed, an error is generated. The reason written was that "The execution fails because the pipe is not expanded and is passed to date as an argument".What is meant by expansion of pipe. When we execute date | wc on the command line, it goes fine.then | is not treated as an argument. Why?
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Feb 16, 2010
I am trying to learn how to pass more than a one-command startup for gnome-terminal.
I will give an example of what I'm trying to do here:
Code:
#! /bin/bash
#
#TODO write this for gnome and xterm
USAGE="
${0##*/} [-x] [-g]
code....
However, running with the -g option to invoke gnome-terminal, I get a "There was an error creating the child process for this terminal" error.
This same error occurs if the gnome-terminal line is changed to
Code:
gnome-terminal -e mcTerm
Is there any way to pass more than one command on to gnome-terminal? I have tried various single and double quoting senarios and in a final attempt, I abstracted to an exported function all to no avail. Perhaps even though gnome-term is better at many things than xterm, xterm trumps it in this instance.
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Apr 13, 2010
I am writing a perl script which uses the matlab compiler to compile a .m file.
I am using the system("mcc �m file.m"). I have matlab installed and both script and exe are in the same drive.But i get the following error .
'mcc' is not a recognised as an internal or external command ,operable in program or batch file.
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Oct 20, 2010
I am using gtk to program GUI. How can I show the output of shell command into a textbox, ex ps -efc command ?
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Oct 15, 2010
I'm trying to convert this awk command from command line into an awk script, but just cannot get it to work:
This is what i have after my BEGIN
Am i missing something here? this just prints out the count for everyline, not counting lines on 5th field that match 'A'
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Nov 19, 2008
suppose i store the history number of a command say :
1004 cat file
Then now i want to run it like : !1004 but by using a variable.
command=1004
!$command
i am getting errors like :
command=1004command
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Mar 9, 2011
I am trying to grep multiple numbers from file, grep does have the -f option for that.
Code: grep -f <`seq 500 520` /etc/passwd I know this could be done with
Code: for i in `seq 500 520`; do grep "$i" /etc/passwd; done But my question is fare more behind this example. It is possible to redirect one command output which will be treat as a content of file for another command ?
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Jul 23, 2010
Is there a command which can be used to run some other command on a few lines from a file or an o/p of some file. (the kind of role that -exec option does for the find command). (I have solved the purpose using a bash loop but would like to know if there exists a command).
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Mar 20, 2011
What's the deal with this bloody commandI trying to do an update of a product.The -f is suppose to "force" the overwrite of existing files isn't it?Well every time I run the command it keeps asking me to allow it to overwrite the files.. the programs is too long for me to sit here hitting the "y" and "enter key"
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Mar 24, 2011
I have a script that will build a list of hosts and it works fine Code: for ((i=$START; i<=$END; i++)); do echo "$NAME$i"; done But I need it to build the START and END on different number formats (i.e. 1 -> 10, 01->10, 001 ->010)
I am trying to use the seq command but can't get it to work quite right with the -w flag in the following Code: for ((myseq=$START; myseq<=$END; myseq ++)) do echo "$NAME${myseq}" done I am fully aware that this syntax is probably wrong, and need to know how to correct it.
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Mar 12, 2011
Is anyone familiar with the Minix OS? i want to know what is the Process to add a new command in Minix that uses system call served by the memory manager server
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Jul 14, 2011
Distro: Centos 5, PHP 5I have done a bit research on running bash commands from php and there was little success. This is my relevant php script
<?php
echo exec('pwd');
?>
[code]...
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May 12, 2010
im trying to get the getopts command to run but for some reason the -d option fails to populate the variable and it remains empty.
Code:
#!/bin/bash
usage()
{
cat << EOF
usage: $0 options
[Code].....
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Aug 19, 2010
I just create a simple c++ program on linux is there a way to intergrate linux command such as ls, du, df and etc on my c++ program?
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Apr 16, 2010
I have many processes running that printf local debug. (they will log to file later!) I start them by
Code:
( sleep 20000000 | fp ) & else they get killed/stop by themselves. So now its running in the background, I want to bring it to the front to see the printfs.
[Code]....
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Feb 3, 2009
I did a search for this but did not see anything relevant.I'm trying to join several strings and execute them as a command but csh does not seem to recognize it as a command, anyone know what I'm doing wrong? numone and numtwo will be passed into the script. (I have to use csh because it is a part of an existing script.)
Code:
#!/bin/csh
set file1=file.dat
[code]...
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May 11, 2009
what i have is a list of words 6 to a line im trying to use the sed command to insert a comma in between each word and at the end of the last one
[code]....
the last line of the variable does not have 6 words what i have so far is this
Code:
words=`cat /usr/share/dict/words |grep "^[$list]*$" | xargs -n 6 echo | sed -e 's/[ ]+/,/g s/$/,/g'`
it dosent work though i originally started off with
Code:
words=`cat /usr/share/dict/words |grep "^[$list]*$" | xargs -n 6 echo | sed -e 's/[ ]+/,/g' this puts a comma inbetween them but takes out the space and dosent put a comma at the end of the line.. basicaly what i needed to know is how i could you multiple sed commands to fix this
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Apr 7, 2011
How would I create a sed or awk command that would add a | to the end of a line if it wasn't already there? I'm trying to import some files into mysql, but some of the lines to not end with a | which is my field delmiter.
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Apr 14, 2011
i'm trying to execute a shell script, i'm trying to use the values in an array for use in a sed command:
sed -n '/Sales ID: ${array[$i]}/,/Totals:/p'
that command creates empty files. so my guess is that its not recognizing the array as an array but as text?
how would i be able to utilize the array in the command? i got it, didnt think that if i doubled up the single quotes that it would work, but this worked:
sed -n '/Sales ID: '${array[$i]'}/,/Totals:/p'
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Sep 6, 2013
How to use shell command?
installs.sh:
Code: Select allapt-get install icedove-l10n-hu
apt-get install rar
apt-get install ...
...
y press key or other language is other key. hungarian key is: i
english after apt-get install in gnome-terminal: (y)es or (n)o
hungarian after apt-get install in gnome-terminal: (i)gen or (n)em
How to yes or no automatically in all languages? Not manual, not 'Y'/'I' or 'N'/'N' keydown.
I would like use this script my fresh installed Debian 7.1. I would like run this install.sh when Debian is installed for my all softwares when i would like use.
10 PC installing easy and faster my script.
If no script is slowly install for my 10 PC.
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Feb 8, 2014
I use udhcp with some of my minimal installs. I've messed around with the code a bit when it wasn't working correctly - a few years ago. I will find time - I hope soonish - to figure out how to do a few other things with it.
For now though, I'm using this string to grab my ip after startup
Code: Select allsu -c 'ifconfig eth0&&ifdown -a&&ifup lo&&ifup eth0'&&/sbin/ifconfig eth0
I realize I could substitute ifup -a but I'm more interested in figuring out how to make ifup wait for the ip to become available if it is not available yet.
Never mind that one, just typing out the question answered it for me, when I find it in the scripting man ' ; : " & =
Or if there are any other suggestions for better construction of the string.
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Mar 24, 2010
what is the best command to use to parse strings?I have a variable $str and need to parse this string.Can you provide an example of the command used to get a substring of $str based on the index values of start and end
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Apr 2, 2010
I would like to know if there is any way to detect a command if it going to be executed in the shell?
Eg:
Cmd: sudo apt-get clean I want a C program to be called before this cmd is executed.
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Aug 11, 2010
I understand that $! is the PID of a command. For example:
Code: #!/bin/bash
myprogram &
echo "PID of myprogram is $!"
I'd like to send the output of "myprogram" to both console and to a log file using the "tee" command but I also want to store the PID of "myprogam". Something like this:
Code: #!/bin/bash
myprogram | tee ./logfile &
echo "PID of myprogram is $!"
The problem is that $! is now the PID of "tee" rather than the PID of "myprogram".
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Mar 24, 2011
I often want to extract some info using awk from a variable/filename while running other things using xargs and sh. Below is an example:
Code: ls -1 *.txt | xargs -i sh -c 'NEW=`echo $0 | awk -F'_' '{print $1}'`; echo $NEW' {}
In the above case I would like to grab just the first field from a filename (delimited by '_') from within an sh command. This is a simplified example, where normally I would be doing some further data processing with the sh command(s).
The error message that I get is:
Code: }`; echo $NEW: -c: line 0: unexpected EOF while looking for matching ``'
}`; echo $NEW: -c: line 1: syntax error: unexpected end of file.
I haven't been able to figure out how to escape the awk command properly.
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Apr 18, 2011
I am always confused about the redirection operator <Lets say i have a file input.txt that contains one word "hello" without the quotes when i do the following why don't i see any output? $echo < input.txt Secondly, i am slightly confused between input redirection < and pipe | operator. Sometimes they seem to do the same thing. For example i can achieve the output from the above command as follows $ cat input.txt | xargs echo
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Mar 14, 2010
Code:
x = self.spinbox37.value() * 40
y = self.spinbox38.value() * 40
[code]...
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