-eq does not exist in a double bracket expression, hence the syntax error. Either use (pattern matching)
or (arithmetic comparison expression)
Note that whichenv does not contain the right value (this is not delivered by the head and tail utilities )
Try for example
To get the number behind the dash
--
Note: the OP was using a double bracket expression, where these quotes are not necessary..
With single brackets the correct expression is either (string comparison):
or (numerical comparison)
I was trying to run a code to check if a fax number is empty or not.
for that, I've written the following code which is throwing an error.
#!/bin/ksh
fax= "999-999-9999"
if ; then
fax_no="000-000-0000"
else
fax_no=$fax
fi
echo $fax_no
And I get the... (7 Replies)
OS Environment: HP-UX B.11.31 U ia64
I am using the shell script code to connect to Oracle RAC database.
Passing the parameter of cluster database name.
typeset -l DB_ID=$1
+ typeset -l DB_ID=sivDB
#---- 3. SetDB validation -------------
if ; then
print... (3 Replies)
Hi Friends,
I have an input file like this
chr1 100 200
chr1 200 300
chr1 300 400
chr1 400 500
chr1 500 600
chr1 600 700
chr1 700 800
chr1 800 900
chr1 900 920
chr1 940 960
I would like to get the first line's second column and the fifth line's 3rd column as one single line. This... (13 Replies)
Hi,
I have file
#cat drivers.txt
fcs0
fcs1
vscsi1
vscsi2
In this i need to check the availabality of "fcs" or "vscsi" alone not vscsi0,fcs1
I tried with "if condition" but it is not working.
cat drivers.txt| while read ADAP
do
echo "Checking for $ADAP"
if ;then
echo "FC... (9 Replies)
HI
My doubt may be basic one but I need to get it clarified..
When i use "if" condition that checks for many AND, OR logical conditions
like
if ]; then
return 0
fi
Even the if condition fails it returns as zero.. Any clue..
But if i add else condition like
if ]; ... (2 Replies)
I have a unix shell script generate.sh that writes to a file hello.txt using redirect.
For example:echo " Today's report shows progress by: " > hello.txt
This hello.txt is then send as an email body to the recipients.
My requirement is to have this special characters(up arrow and down arrow... (6 Replies)
Everyday I have to get a list of files in a directory with a special condition and feed this list to a for loop to be processed. Since I do not use Unix all the time, it is tricky for me to get that list of files. So, the question is whether there are commands that will give me the file names... (12 Replies)
Discussion started by: april
12 Replies
LEARN ABOUT HPUX
pthread_cond_signal
pthread_cond_signal(3T)pthread_cond_signal(3T)NAME
pthread_cond_signal(), pthread_cond_broadcast() - unblock one or all threads waiting on a condition variable
SYNOPSIS PARAMETERS
cond Pointer to the condition variable to be signaled or broadcast.
DESCRIPTION
The function is used to wake-up one of the threads that are waiting for the occurrence of a condition associated with condition variable
cond. If there are no threads blocked on cond, this function has no effect. If more than one thread is blocked on cond, the scheduling
policy determines which thread is unblocked. It is possible that more than one thread can be unblocked due to a spurious wakeup.
The function is used to wake-up all threads that are waiting for the occurrence of a condition associated with the condition variable cond.
If there are no threads blocked on cond, this function has no effect. If more than one thread is blocked on cond, the scheduling policy
determines the order in which threads are unblocked.
The condition variabled denoted by cond must have been dynamically initialized by a call to or statically initialized with the macro
An unblocked thread will reacquire the mutex it held when it started the condition wait before returning from or The threads that are
unblocked contend for the mutex according to their scheduling policy and priority.
The or functions can be called by a thread whether or not it currently owns the condition variable's associated mutex. For predictable
scheduling behavior and to prevent lost wake-ups, the mutex should be held when signaling a condition variable.
Usage
When using condition variables, there is a boolean predicate associated with each condition wait. If this predicate is false, the thread
should do a condition wait. Spurious wakeups may occur when waiting on a condition variable. Because the return values from and do not
imply anything about the value of this predicate, the predicate should always be re-evaluated.
Applications using condition variables typically acquire a mutex and enter a loop which checks the predicate. Depending on the value of
the predicate, the thread either breaks out of the loop or waits on the condition. On return from the condition wait, the predicate is re-
evaluated.
RETURN VALUE
Upon successful completion, and return zero. Otherwise, an error number is returned to indicate the error (the variable is not set).
ERRORS
For each of the following conditions, if the condition is detected, the and functions return the corresponding error number:
[EINVAL] cond is not a valid condition variable.
[EFAULT] cond parameter points to an illegal address.
AUTHOR
and were derived from the IEEE POSIX P1003.1c standard.
SEE ALSO pthread_cond_init(3T), pthread_cond_wait(3T).
STANDARDS CONFORMANCE
Pthread Library pthread_cond_signal(3T)