Is there a way to get echo to make newlines without using any type of quotes? I've done a lot of searches and went into my Linux book to no avail. I'm trying to write five separate lines to a file. I can get echo to accept all five lines like this
echo \
\this is line 1\
\this is line 2\ >... (6 Replies)
So in my shell i execute:
{ while true; do echo string; sleep 1; done } | read line This waits one second and returns.
But
{ while true; do /bin/echo string; sleep 1; done } | read line continues to run, and doesn't stop until i kill it explicitly.
I have tried this in bash as well as zsh,... (2 Replies)
Bit of a weird one i suppose, i want to use an echo inside an echo... For example...
i have a script that i want to use to take users input and create another script. Inside this script it creates it also needs to use echos...
echo "echo "hello"" >$file
echo "echo "goodbye"" >$file
... (3 Replies)
Hi Guys,
I need to print a value in the same line , But when we use the echo instead the loops (while), the value goes to the next line..
Can you help me in this..
Thanks For your help in advance. (6 Replies)
echo `echo ` doesn't echoes anything. And it's logic. But
echo `echo `echo ` ` does echoes "echo". What's the logic of it? the `echo `echo ` inside of the whole (first) echo, echoes nothing, so the first echo have to echo nothing but echoes "echo"
(too much echoing :P):o (2 Replies)
I came across and unexpected behavior with redirections in tcsh. I know, csh is not best for redirections, but I'd like to understand what is happening here.
I have following script (called out_to_streams.csh):
#!/bin/tcsh -f
echo Redirected to STDOUT > /dev/stdout
echo Redirected to... (2 Replies)
Hello,
I'm working with ksh.
I was working with the echo command
That is
echo "Today is $date"
which would show for example
Toady is 7/12/12
which was fine
however, know I only recieve the first part of the echo without the date.
Today is
Could I have edited the echo... (9 Replies)
Hi guys,
Been messing around with shell programming for a couple of days and I found something that was pretty odd in the behavior of the echo command. Below is an example-:
When I type the following in my /home directory from my lxterminal in Debian-:
echo "`ls -l`"
I get the... (2 Replies)
Discussion started by: sreyan32
2 Replies
LEARN ABOUT OPENSOLARIS
_lwp_sema_wait
_lwp_sema_wait(2) System Calls _lwp_sema_wait(2)NAME
_lwp_sema_wait, _lwp_sema_trywait, _lwp_sema_init, _lwp_sema_post - semaphore operations
SYNOPSIS
#include <sys/lwp.h>
int _lwp_sema_wait(lwp_sema_t *sema);
int _lwp_sema_trywait(lwp_sema_t *sema);
int _lwp_sema_init(lwp_sema_t *sema, int count);
int _lwp_sema_post(lwp_sema_t *sema);
DESCRIPTION
Conceptually, a semaphore is an non-negative integer count that is atomically incremented and decremented. Typically this represents the
number of resources available. The _lwp_sema_init() function initializes the count, _lwp_sema_post() atomically increments the count, and
_lwp_sema_wait() waits for the count to become greater than 0 and then atomically decrements it.
LWP semaphores must be initialized before use. The _lwp_sema_init() function initializes the count associated with the LWP semaphore
pointed to by sema to count.
The _lwp_sema_wait() function blocks the calling LWP until the semaphore count becomes greater than 0 and then atomically decrements it.
The _lwp_sema_trywait() function atomically decrements the count if it is greater than zero. Otherwise it returns an error.
The _lwp_sema_post() function atomically increments the semaphore count. If there are any LWPs blocked on the semaphore, one is unblocked.
RETURN VALUES
Upon successful completion, 0 is returned. A non-zero value indicates an error.
ERRORS
The _lwp_sema_init(), _lwp_sema_trywait(), _lwp_sema_wait(), and _lwp_sema_post() functions will fail if:
EINVAL The sema argument points to an invalid semaphore.
EFAULT The sema argument points to an illegal address.
The _lwp_sema_wait() function will fail if:
EINTR The function execution was interrupted by a signal or fork(2).
The _lwp_sema_trywait() function will fail if:
EBUSY The function was called on a semaphore with a zero count.
The _lwp_sema_post() function will fail if:
EOVERFLOW The value of the sema argument exceeds SEM_VALUE_MAX.
SEE ALSO fork(2)SunOS 5.11 8 May 1998 _lwp_sema_wait(2)