03-15-2008
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi all,
I'm new to shell scripting.
I want to copy initial few lines(say first 10 lines) from a file to another file.
There is no "head" command in our embedded system.
sed & awk is there which I believe will do that, but I dont know how to.
This is linux 2.6 (embedded)
So please help me.... (5 Replies)
Discussion started by: jockey007
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2. Shell Programming and Scripting
Hi,
I have a abc.txt file.
In this file there is a SQL query which Iwant to copy and print it on another file.The query (for eg) is written like this:
SELECT field1,
field2,
field3
from table1,table2
where <conditions>
END
I want to copy this query to another... (3 Replies)
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3. Shell Programming and Scripting
Hi All,
I have a file that gives me new line/output every 5 minutes. I need to create a script that capture new line/output besides "IN CRON_STATUS", in this case the new output is "begin ------ cron_status.sh - -----------".
I want this script to capture the line starting from "begin ------... (0 Replies)
Discussion started by: fara_aris
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4. Shell Programming and Scripting
Hello everyone. I have a log file that contains multiple domains:
www.thisdomain.com
agent.thisdomain.com
that.thisdomain.com
I need to copy all of the lines that contain "www.thisdomain.com" from the log and output them into a new file. I've tried everything with little luck. Please help... (3 Replies)
Discussion started by: aberli
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5. UNIX for Dummies Questions & Answers
Dear All,
I am working with windoes OS but remote a linux machine. I wonder the way to copy an paste some part of a huge file in linux machine.
the contain of file like as follow:
...
dump annealling all custom 10 anneal_*.dat id type x y z q
timestep 0.02
run 200000
Memory... (2 Replies)
Discussion started by: ariesto
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6. Shell Programming and Scripting
Hello,
I have a text file which I need to check for presence of certain tags, and then copy a subsequent portion of text into another file. The tag matching canbe done with Grep but I do not know how to copy selective lines from one file to another. Is it possible do that?
I checked up some... (8 Replies)
Discussion started by: ajayram
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7. Shell Programming and Scripting
Hi Guys,
I have the following problem. I have original file (org.txt) that looks like this
module v_1(.....)
//arbitrary number of text lines
endmodule
module v_2(....)
//arbitrary number of text lines
endmodule
module v_3(...)
//arbitrary number of text lines
endmodule
module... (6 Replies)
Discussion started by: kaaliakahn
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8. Shell Programming and Scripting
Hi Guys,
I have an awk script that would search the input file for line that starts with a number 3 and copies into a new text file.
I want to extend this script to find the lines that either starts with 3 or a or b and copy all those lines into the new file.
Here is what I have so far:... (1 Reply)
Discussion started by: Amith821
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9. UNIX for Beginners Questions & Answers
Dear all,
I have stuck with this problem for some days.
I have a very big file, this file can not open by vi command.
There are 200 loops in this file, in each loop will have one line like this:
GWA quasiparticle energy with Z factor (eV)
And I need 98 lines next after this line.
Is... (6 Replies)
Discussion started by: phamnu
6 Replies
10. Shell Programming and Scripting
OS : RHEL 7.2
Shell : bash
I have a file which has lines like below
I want to copy from 2nd line to the 6th line and copy(redirect) those lines to another file.
$ cat patterns.txt
hello world
hello asia
hello europe
hello africa
hello america
hello antartica
hello... (9 Replies)
Discussion started by: omega3
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LEARN ABOUT MOJAVE
get_robust_list
GET_ROBUST_LIST(2) Linux System Calls GET_ROBUST_LIST(2)
NAME
get_robust_list, set_robust_list - get/set list of robust futexes
SYNOPSIS
#include <linux/futex.h>
#include <sys/types.h>
#include <syscall.h>
long get_robust_list(int pid, struct robust_list_head **head_ptr,
size_t *len_ptr);
long set_robust_list(struct robust_list_head *head, size_t len);
Note: There are no glibc wrappers for these system calls; see NOTES.
DESCRIPTION
These system calls deal with per-thread robust futex lists. These lists are managed in user space: the kernel knows only about the loca-
tion of the head of the list. A thread can inform the kernel of the location of its robust futex list using set_robust_list(). The
address of a thread's robust futex list can be obtained using get_robust_list().
The purpose of the robust futex list is to ensure that if a thread accidentally fails to unlock a futex before terminating or calling
execve(2), another thread that is waiting on that futex is notified that the former owner of the futex has died. This notification con-
sists of two pieces: the FUTEX_OWNER_DIED bit is set in the futex word, and the kernel performs a futex(2) FUTEX_WAKE operation on one of
the threads waiting on the futex.
The get_robust_list() system call returns the head of the robust futex list of the thread whose thread ID is specified in pid. If pid is
0, the head of the list for the calling thread is returned. The list head is stored in the location pointed to by head_ptr. The size of
the object pointed to by **head_ptr is stored in len_ptr.
Permission to employ get_robust_list() is governed by a ptrace access mode PTRACE_MODE_READ_REALCREDS check; see ptrace(2).
The set_robust_list() system call requests the kernel to record the head of the list of robust futexes owned by the calling thread. The
head argument is the list head to record. The len argument should be sizeof(*head).
RETURN VALUE
The set_robust_list() and get_robust_list() system calls return zero when the operation is successful, an error code otherwise.
ERRORS
The set_robust_list() system call can fail with the following error:
EINVAL len does not equal sizeof(struct robust_list_head).
The get_robust_list() system call can fail with the following errors:
EPERM The calling process does not have permission to see the robust futex list of the thread with the thread ID pid, and does not have
the CAP_SYS_PTRACE capability.
ESRCH No thread with the thread ID pid could be found.
EFAULT The head of the robust futex list can't be stored at the location head.
VERSIONS
These system calls were added in Linux 2.6.17.
NOTES
These system calls are not needed by normal applications. No support for them is provided in glibc. In the unlikely event that you want
to call them directly, use syscall(2).
A thread can have only one robust futex list; therefore applications that wish to use this functionality should use the robust mutexes pro-
vided by glibc.
In the initial implementation, a thread waiting on a futex was notified that the owner had died only if the owner terminated. Starting
with Linux 2.6.28, notification was extended to include the case where the owner performs an execve(2).
The thread IDs mentioned in the main text are kernel thread IDs of the kind returned by clone(2) and gettid(2).
SEE ALSO
futex(2), pthread_mutexattr_setrobust(3)
Documentation/robust-futexes.txt and Documentation/robust-futex-ABI.txt in the Linux kernel source tree
COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the
latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
Linux 2017-09-15 GET_ROBUST_LIST(2)