09-24-2014
Since new thread is started, this one is closed...
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi Guys,
I wanted to count the number of records for a particular field of a file. whose fields are separated by comma","
I fI use this command.
cat "filename" cut -sd "," -f13 | wc -l
This shows all the lines count including the blank values for the field number 13. I wanted to count... (2 Replies)
Discussion started by: Swapna173
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2. Filesystems, Disks and Memory
I'm not 100% sure if this was the right place to post in but here i go:
I'm attempting to migrate a physical windows disk onto my SAN through the use of the dd copy command. I'm booting into knoppix, running dd, and then bringing the server back up into windows running on the SAN. Everything... (2 Replies)
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3. Shell Programming and Scripting
I have the test data with 10 column separated by comma and each column has more than 1000000 rows. Can anyone help me to find empty field in all columns and delete that empty field alone and lift that column up by one row.
Data with empty field:
A74203XYZ,A21718XYZ,A72011XYZ,A41095XYZ,... (7 Replies)
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4. Shell Programming and Scripting
May data
Name = Andi
Address = none
Phone = 82728
Name = Peter
Address = none
Phone = 98799
The expected output
Name,Address,Phone
Andi,none,82728
Peter,none,98799
what i have done (6 Replies)
Discussion started by: before4
6 Replies
5. UNIX for Dummies Questions & Answers
Hi all !
I'm sure it is a basic question but I didn't find any threads that fit my need.
How to remove empty fields with awk?
Or in other words, how to shift all the fields after an empty field on the left?
input:
1|2||3|4|5||6
wanted:
1|2|3|4|5|6
I tried:
awk '{for(i=1; i<=NF;... (7 Replies)
Discussion started by: lucasvs
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6. Shell Programming and Scripting
I have below file
25-09-2012 24-09-2012 19-09-2012 31-07-2012 30-04-2012 30-03-2012
ASIAEXFVNV N/A CEU 4
DMIRSOA N/A CAS 2 2 2
DMIRSOA N/A MIDMT 2
NFIAL22 N/A HVNY 11 11 11
NFIAL22 N/A NYAL3 11 11 11
NFIAL22 N/A NYCN 11 11 11 ... (4 Replies)
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7. Shell Programming and Scripting
HI
Input A.txt
ABC907 ABC907_1B_9
ABC985 ABC985_1A_9
ABC985 ABC985_1B_9
ABC985 ABC985_1C_9
ABC05037 ABC05037_1A_9
ABC05037 ABC05037_1B_9
Base of column 2 last third char.
If It is A the 1,if B then 2 If C then 3
File B.txt
ABC907 ABC907_1B_9 2
ABC985 ABC985_1A_9 1
ABC985... (8 Replies)
Discussion started by: asavaliya
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8. Shell Programming and Scripting
Hi ! programmers
I have a need of detecting empty field in file
my file looks like this
40.900|-71.600|1.6|20|1|1961|21.00|3.700||1|US|28035|10029370|31
40.900|-71.600|5.7|20|1|1961|21.00|3.700||1|US|28035|10029370|31
40.900|-71.600|7.8|20|1|1961|21.00|3.700||1|US|28035|10029370|31... (7 Replies)
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9. Shell Programming and Scripting
Hi All,
I am trying to write a shell script which takes parse the web form find the input field and dump the data of that field into one xml file. The form looks like,
<input type="button" id="btnSave" value="Save" onclick="saveXmlData()"/>
<form name="submitForm"... (1 Reply)
Discussion started by: jdp
1 Replies
10. UNIX for Dummies Questions & Answers
How to Copy non-empty files into subdirectory
I have directory A
there are bunch of files: a.txt a.txt.target b.txt b.target.txt.......
How can i find out the non-empty file within *.txt.target and copy them into a subdirectory B?
Thank you. (2 Replies)
Discussion started by: grace_shen
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LEARN ABOUT MINIX
set_tid_address
SET_TID_ADDRESS(2) Linux Programmer's Manual SET_TID_ADDRESS(2)
NAME
set_tid_address - set pointer to thread ID
SYNOPSIS
#include <linux/unistd.h>
long set_tid_address(int *tidptr);
Note: There is no glibc wrapper for this system call; see NOTES.
DESCRIPTION
For each thread, the kernel maintains two attributes (addresses) called set_child_tid and clear_child_tid. These two attributes contain
the value NULL by default.
set_child_tid
If a thread is started using clone(2) with the CLONE_CHILD_SETTID flag, set_child_tid is set to the value passed in the ctid argu-
ment of that system call.
When set_child_tid is set, the very first thing the new thread does is to write its thread ID at this address.
clear_child_tid
If a thread is started using clone(2) with the CLONE_CHILD_CLEARTID flag, clear_child_tid is set to the value passed in the ctid
argument of that system call.
The system call set_tid_address() sets the clear_child_tid value for the calling thread to tidptr.
When a thread whose clear_child_tid is not NULL terminates, then, if the thread is sharing memory with other threads, then 0 is written at
the address specified in clear_child_tid and the kernel performs the following operation:
futex(clear_child_tid, FUTEX_WAKE, 1, NULL, NULL, 0);
The effect of this operation is to wake a single thread that is performing a futex wait on the memory location. Errors from the futex wake
operation are ignored.
RETURN VALUE
set_tid_address() always returns the caller's thread ID.
ERRORS
set_tid_address() always succeeds.
VERSIONS
This call is present since Linux 2.5.48. Details as given here are valid since Linux 2.5.49.
CONFORMING TO
This system call is Linux-specific.
NOTES
Glibc does not provide a wrapper for this system call; call it using syscall(2).
SEE ALSO
clone(2), futex(2), gettid(2)
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 SET_TID_ADDRESS(2)