Programming :: Get String From System Command Output ?

May 15, 2010

I have found this from a site [url]

Code:

But it does not work for me, segfault.

View 7 Replies


ADVERTISEMENT

Programming :: Pthread - Take String From The Command Line And Creates A Thread To Print The String

May 3, 2011

I've been trying to understand pthread in C a little better. So I made a simple program that takes in a string from the command line and creates a thread to print the string. I've looked online and copied the basic concepts but there are something things I'm confused about. The programs works just fine, but I have questions. Here's what I have so far.

[Code]....

One thing I'd like to know is why the 3rd argument in the pthread_create function which is my SendMessage function needs to be typecasted to a void pointer and then send the address of the function. Also as for the 4th argument, I would see typecasting to void pointer in some of the pthread examples I saw online, but in my case I'm passing a char pointer, would this be correct? In which case would I ever want to pass a void pointer?

Do I need a pthread_exit(NULL) in my main and in the SendMessage function? If so, why? I added the sleep() function so that I could let the pthread_exit function in my SendMessage function execute first. I simply saw that the online examples on pthread had pthread_exit() in both locations.

View 6 Replies View Related

Programming :: The String H4x0rz Does Not Come Up In The Output?

Feb 28, 2011

why isnt this working as i am expecting:

Code:
[schneidz@hyper temp]$ cat example.tmp
hello world

[code]....

View 1 Replies View Related

Programming :: Uncertain Output Of C++ String Concatenation Program

Sep 15, 2010

The below program is giving unpredictable and wrong output when I compile with g++ under Ubuntu OS , tried with the complier avilable with Ubuntu 8.04 and Ubuntu 10.04 LTS.

But it works fine when complied and ran Redhat g++ 3.4.6

View 5 Replies View Related

Programming :: Copy String A To String B And Change String B With Toupper() And Count The Chars?

Oct 22, 2010

copy string a to string b and change string b with toupper() and count the chars

View 3 Replies View Related

Programming :: Show The Output Of Shell Command Into A Textbox, Ex Ps -efc Command?

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 ?

View 3 Replies View Related

Programming :: Replace Occurrence Of A String In Many Files In One Command?

Oct 30, 2010

I used a command Code:

grep -r err_sys ./
its output is
Code:
./tcpclitime.c:err_sys("socket error");
./tcpclitime.c:err_sys("connect error");
./tcpclitime.c:err_sys("write error");
./tcpclitime.c:err_sys("shutdown error");
./tcpclitime.c:err_sys("read error, n = %d", n);
[Code].....

Is it possible some how to replace all the occurrences of word err_sys by printf.

View 1 Replies View Related

Programming :: Web Development - Command To Search String Through Files On A Server?

Apr 8, 2009

I am web developer I have this command find . -exec grep "Improve your score" '{}' ; -print for searching through files . I found this command but now i would like to tweak it to gain more out of it.

View 2 Replies View Related

Programming :: Variable String File Base - Output File Doest Not Exclude The Values In Grep -av

May 1, 2011

My script.

This is may script:

Code:

Problem: Output file doest not exclude the values in grep -av

View 3 Replies View Related

Programming :: Find And Replace A String In A File Using Perl Command From Bash Script?

Feb 14, 2011

I wanted to find and replace a string from a perl file. I have written a script in bash which runs the following command.

perl -pi -e "s/$findstring/$replacestring/" testfile
where as $findstring = print F_WC_TMP"$line
";
and $replaceString = $line = join ' ', split ' ', $line; print F_WC_TMP"$line
";

But when I am running the above command, i think it is replacing the $findstring with the above mentioned string and hence it contains a $line, it is looking for the variable $line and not finding the exact string. I am confused about how to search for a string that contains $ in it and replace it with another $string.

View 5 Replies View Related

Programming :: Using Sed To Modify Command Output?

Jun 13, 2010

The output of a command changed and I need to extract the data and print it out in a different fassion:

Code:
abcd1=aaaa xx
abcd 2 aaa xx bbb
abcd2=aaaa xy
ab 2 xx aaa bbb ccc xxx
should be transformed to:

[Code]...

Currently I used sed "search1|search2|search3" to get the lines that need to be transformed. But I also need to search for substrings in those lines and I need to print those substrings in a specific order together with other characters. How is this done with sed?

View 7 Replies View Related

Programming :: Bash Ambiguous Redirect - Redirect One Command Output Which Will Be Treat As A Content Of File For Another Command?

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 ?

View 2 Replies View Related

Programming :: Echo Two Command Output In The Same Line?

Jan 25, 2011

I try to write script and echo two command at the same line .

echo "A"
echo "B"

How can I pipe above two command at the same line in text file . So, in the output text file , you can see below ? Code: A B not Code: A B

View 4 Replies View Related

Programming :: Diverting IDL Output To The Command Line?

Jul 14, 2010

I'm troubleshooting a batch of scripts I'm modifying, including an IDL script called by a .csh script. the IDL scripts were provided to me by a coworker and my .csh script is intended to automate a lengthy set of extremely tedious and time consuming processing tasks.

I am currently in the process of debugging, and can't get the IDL to print any messages other than critical failures to the screen. Is there any easy way to redirect the stdout to either a logfile or the screen?

View 2 Replies View Related

Programming :: Giving Output Of A Command As The Input To Another

Sep 7, 2010

While making a shell ,there is the following problem Im facing:

I am expecting the user to enter commands in the following format :

I am to separate these and the output of ls -l should be given as input to grep and the output of both to more.

But I am allowed (by our instructor) to use dup/dup2 or any other command(but not pipe or tees).

How to connect the file descriptors after successful execution of each command?

View 5 Replies View Related

Programming :: Store Output Of Command With Pipes?

Jan 20, 2011

I need to find one RUNNING word in latest created logs.
and as soon as i will get RUNNING WORD , i have to execute another Unix Command.

I wrote following script code...

View 3 Replies View Related

Programming :: Omit Specified Characters From The Output Of A Command?

Nov 18, 2010

After typing "man cut" in my terminal I can't seem to find this answer.

I am trying to write several shell scripts and want to remove the 'lp:<package name>' from the beginning of each line of the output of "bzr ls" as well as any notices at the beginning of the output, leaving only file and folder paths.

View 6 Replies View Related

Programming :: Using Bash Command To Execute Output Of Awk?

Mar 24, 2011

I am trying to process a column separated data file, with a few bash command. For example, I have

Code:

file1 aaaa yes
file2 aaaa no
file3 bbbb yes

Let say I want to create new file with the output of first column and do something else with the output of 3rd column. Of course there are many ways to process this data file, but I wish to know by using awk, how could I do it. I'm trying:

Code:

awk '{system("touch $1")}' datafile

but the shell command will not able to get the awk '$1' output. How do I get this done ? And for another question, if the data file contains the variable name of a shell variable, how could I make use of it during a awk output ? For example I have a datafile1:

Code:

server1 yes
server2 no

And in another server declaration data file, I got this datafile2:

Code:

server1=xxx1
server2=yyy1

And in my awk script, I want to achieve something like (the syntax is definitely wrong, just to demonstrate what I assume it will like):

[code]....

View 12 Replies View Related

Programming :: Assigning Output Of A Command To An Array In Perl?

Nov 25, 2010

I am trying to execute a Unix Command in perl and assigning its output to an array:

Code:
@File_List=exec("ls -1 /tmp");
but it is not working. I have tried the perl function system() also but its return code is

[code]...

View 10 Replies View Related

Programming :: Receive Command Output And Store It To A Variable?

Apr 3, 2010

Suppose I want to account number of files beginning with abc , I can use "ls 'abc* | grep abc | wc -l", this will return me a number.
I want to store this number in a variable, say var1, so I tried
1. "ls 'abc* | grep abc | wc -l |read var1", but this didn't work as var1 has no value somehow.
2. var1='ls 'abc* | grep abc | wc -l', this just assign the entire string "ls 'abc* | grep abc | wc -l" to var1, which is not I wanted.

I don't want to store the value to a temporary file and then read the value from that file. I think there should be a direct way to get the value, but don't know how. I know in tcsh, one can just use set var1='ls 'abc* | grep abc | wc -l', but it also doesn't work in bash. Can anyone give any clue about this?

View 5 Replies View Related

Programming :: Direct Standard Output From Find Command?

Mar 26, 2010

I'm trying to pull out sections from a bunch of files. For one file, I use:

Code:
sed '/string1/,/string2/ !d' <filename.ext >newfilename.ext
to pull out everything between two strings in the original file and put them in a new file.

[code]....

View 3 Replies View Related

Programming :: Organize Bash Script Output Of Which Is Like On Top Command

Sep 12, 2010

Is it possible to organize bash script output of which is like on top command i.e. monitoring every let's say 1 sec and old information would cleared?

View 3 Replies View Related

Programming :: Retrieving And Organizing Data From Command Output?

Mar 31, 2011

I was messing around with Bash scripting just now and was wondering if there was a way to organize the output of a command into an array. Like the Bash equivalent of the PHP explode() function.

View 3 Replies View Related

Programming :: Sort Command Output Differs When Encounters?

Mar 18, 2010

Here is what I am doing I have a file, a.txt for example, with following contents:

Code:
coreutils install
cpio install
cpp install
cpp-4.3 install
dbus install

[Code]...

So it seems like the sorting algo. for dpkg --get-selections is different than sorting algo. of 'sort' command when it encounters "-" (hyphen). How can I sort the original file (a.txt) in such a way that it produces the output file ,b.txt, exactly the same.

View 6 Replies View Related

Programming :: Reading Command Output By Line In Bourne Script?

Feb 13, 2010

I have a command which generates the following output:

Code:
$ sudo vnconfig -l
vnd0: not in use

[code]...

View 6 Replies View Related

General :: Identify File System Type From The Output Of Fdisk Command?

Nov 16, 2010

The output of my fdisk command is as follows :-zodiac@gml-admin:~$ sudo fdisk -l[sudo] password for zodiac: Disk /dev/sda: 160.0 GB, 160041885696 bytes255 heads, 63sectors/track, 19457 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xe30ce30c

Device Boot Start End Blocks Id System
/dev/sda1 * 1 1958 15727603+ 7 HPFS/NTFS
/dev/sda2 1959 4752 22437838 f W95 Ext'd (LBA)

[code]...

View 2 Replies View Related

Programming :: Creating Array From Command Output (Bash Shell Script)

Jan 26, 2011

I have a command that outputs n lines of text, and I want to place each line into an array element, but I can't seem to get the syntax correct

So my command is this:
cat $configfile | sed -n '/cluster:'$clustername'/,/cluster/ p' | awk /host/

Which produces many lines depending on the value of $clustername. I'd like to get each line as elements of an array.

View 5 Replies View Related

Programming :: Using Sed Replace Line Containing Particular String By A Single String?

Oct 16, 2010

I have a set of lines as ahown below:

Leon went to school
Leon came back from school..
Leon had dinner...

I have to replace the line containing "dinner" by a single string LUNCH...

View 2 Replies View Related

Programming :: Creates String Suffixes Out Of A Reference String?

Feb 25, 2011

I need to creates string suffixes out of a Reference string. for eg. suffixes of abcdefg will be

1)bcdefg
2)cdefg
3)defg
and so on...

create an array of pointers to point to the first few characters and then use that pointer to print the rest of the string.But when i print using the pointer i get GARBAGE values! shudn't std::cout<<ptr[w] print the string following the char it is pointing to? why do i get garbage values?

View 9 Replies View Related

Programming :: C - Put A Specific Arbitrary Part Of A String Into It's Own String?

Apr 18, 2010

So if I'm given a location of a file like:

How can I just take the type of the file at the end? I know I can use strrchr() for a period to get the pointer to the period just before file type. Is there a build in string function that will just take the rest of the string from a certain point on forward in the string? I know it wouldn't be much work to make it myself, but I figured I would find out if it already existed before doing it.

View 9 Replies View Related







Copyrights 2005-15 www.BigResource.com, All rights reserved