06-25-2012
What shell are you using? what is your OS?
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
This is likely to be a dumb one.
How can I use sed to substitute string occurances having it read from an input file and write to this very same file ?
I have a file with lots of occurances of '2006', I want to change it to '2007', but I'd like these changes to be saved on the input file.
... (5 Replies)
Discussion started by: 435 Gavea
5 Replies
2. Shell Programming and Scripting
I have tried to show the file name whose size is greater than 200 byte in current directory.
Please help me.
ls -l | tr -s " " " " | cut -f 5,9 -d " " >out.txt
#set -a x `cat out.txt`
i=0
`cat out.txt` | while
do
read x
echo $x
#re=200
j=0
if }" < "200" ]
then
echo $j
j=`expr $j... (2 Replies)
Discussion started by: rinku
2 Replies
3. UNIX for Dummies Questions & Answers
Is it possible to write to file descriptor 0 and read from 1 or 2? How could this be implemented? (3 Replies)
Discussion started by: machshev
3 Replies
4. Shell Programming and Scripting
Is there any way to write to a text file with scripting? I need to write to a text file two lines of text for the amount of files in the current directory. (9 Replies)
Discussion started by: Fred Goldman
9 Replies
5. IP Networking
Hi,
We have smb client running on two of the linux boxes and smb server on another linux system. During a backup operation which uses smb, read of a file was allowed while write to the same file was going on.Also simultaneous writes to the same file were allowed.Following are the settings in the... (1 Reply)
Discussion started by: swatidas11
1 Replies
6. Shell Programming and Scripting
hi
i am quite new to shell scripting and need help in reading and writing in xml file
i have an xml file with format:
<main>
<store>
<name>ABC</name>
<flag>0</flag>
<size>123<size>
</store>
<store>
<name>DEF</name>
... (2 Replies)
Discussion started by: kichu
2 Replies
7. Shell Programming and Scripting
I have got a file in following format:
AAAAAAA
BBBBBBBB
CCCCCCC
DDDDDDD
I am trying to read this file and out put it in following format:
AAAAAAA,BBBBBBB,CCCCCCC,DDDDDD
Preferred method is shell or Perl.
Any help appreciated. (11 Replies)
Discussion started by: Araoki
11 Replies
8. Shell Programming and Scripting
Hello Guys, How all are doing?
I have an issue in Unix and want help from all of you
I have a file in UNIX which it read by line by line , If at the end of line '0' is written the it should fetch that line into another file and change '0' to '1'
and If at the end of line '1' is written then it... (10 Replies)
Discussion started by: adisky123
10 Replies
9. Shell Programming and Scripting
Hi,
I am trying to do a write operation followed by a read operation on the same file through Perl, expecting the output produced by read to contain the new lines added, as follows:
#! /usr/bin/perl -w
open FH, "+< testfile" or die "$@";
print FH "New content added\n";
while (my $line =... (1 Reply)
Discussion started by: royalibrahim
1 Replies
10. Shell Programming and Scripting
Hi
I am trying to build a web form where it can take the input from the user and write it to a file. And when I will open that form again that for should read the file that was created at the 1st step and all the fields should auto populate from that file. I have 20 text fields in my form. I... (1 Reply)
Discussion started by: sauravrout
1 Replies
LEARN ABOUT SUNOS
pthread_rwlock_wrlock
pthread_rwlock_wrlock(3C) pthread_rwlock_wrlock(3C)
NAME
pthread_rwlock_wrlock, pthread_rwlock_trywrlock - lock or attempt to lock read-write lock object for writing
SYNOPSIS
cc -mt [ flag... ] file... -lpthread [ library... ]
#include <pthread.h>
int pthread_rwlock_wrlock(pthread_rwlock_t *rwlock);
int pthread_rwlock_trywrlock(pthread_rwlock_t *rwlock);
The pthread_rwlock_wrlock() function applies a write lock to the read-write lock referenced by rwlock. The calling thread acquires the
write lock if no other thread (reader or writer) holds the read-write lock rwlock. Otherwise, the thread blocks until it can acquire the
lock.
The pthread_rwlock_trywrlock() function applies a write lock like the pthread_rwlock_wrlock() function, with the exception that the func-
tion fails if any thread currently holds rwlock (for reading or writing).
Writers are favored over readers of the same priority to avoid writer starvation. See pthread_rwlock_rdlock(3C).
Results are undefined if any of these functions are called with an uninitialized read-write lock.
If a signal is delivered to a thread waiting for a read-write lock for writing, upon return from the signal handler the thread resumes
waiting for the read-write lock for writing as if it was not interrupted.
If successful, the pthread_rwlock_wrlock() function returns 0. Otherwise, an error number is returned to indicate the error.
The pthread_rwlock_trywrlock() function returns 0 if the lock for writing on the read-write lock object referenced by rwlock is acquired.
Otherwise an error number is returned to indicate the error.
The pthread_rwlock_wrlock() function will fail if:
EDEADLK The current thread already owns the read-write lock for writing or reading.
The pthread_rwlock_trywrlock() function will fail if:
EBUSY The read-write lock could not be acquired for writing because it was already locked for reading or writing.
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
pthread_rwlock_init(3C), pthread_rwlock_unlock(3C), pthread_rwlockattr_init(3C), pthread_rwlock_rdlock(3C), attributes(5), standards(5)
23 Mar 2005 pthread_rwlock_wrlock(3C)