The braces are used when there are multiple commands you want to execute after || but you could also write this as an "if then else" if that's more convenient. Then it's easier to add commands, too.
The braces and the semicolons are not necessary here, because everything up to "fi" (or "else") is executed when the condition matches. The || { stuff; } syntax is just basically a shorthand for when you want to cram stuff into a one-liner.
Hi friends, :)
In a shell script i found the following if condition.
echo -n "Which version of $1 do you want to restore ('0' to quit)? : "
read desired
if ${desired:=1} -ge $index ] ; then
echo "$0: Restore canceled by user: index value too big." >&2
exit 1
fi
Can... (1 Reply)
i have a paramter data_date in which i am passing a string value.i want to find out another paramter file_date from this.the logic is given below
if day of data_date = sunday or monday
then
file_date=data_date-1
else
file_date=data_date-2
i am passing data_date as 20061027.
how can i... (3 Replies)
Hi,
I am trying to execute this command, but is it not working, says "`;' unexpected"
eval $lgrep $SAM_CMD ; if ; then ; echo "No Error" ; fi
What i want is, return the command output, if it is non zero, say "No Error".
Thanks, John. (21 Replies)
Executed the following if conditions .. and got different results .
only (( )) gave correct o/p with all scenarios .
Can anybody please let me know what is the difference between and ] and ((condition)) when used with if condition.
And why each condition gave different result.
1.... (2 Replies)
hi,
I have some problems in my simple script about the redirect echo stdout command inside a condition. Why is the echo command inside the elif still execute in the else command
Here are my simple script
After check on the two diff output the echo stdout redirect is present in two diff... (3 Replies)
HI
My doubt may be basic one but I need to get it clarified..
When i use "if" condition that checks for many AND, OR logical conditions
like
if ]; then
return 0
fi
Even the if condition fails it returns as zero.. Any clue..
But if i add else condition like
if ]; ... (2 Replies)
Hi all
Unix newbie - please be gentle
Am modifying an existing script to error trap a variable with a length of 0
#!/bin/bash
ipfile='/var/data/bin/ipaddress'
] && ipold="$(< "$ipfile" )"
ipnew="$( wget -q -O - checkip.dyndns.org | sed -e 's/.*Current IP Address: //;s/<.*$//' )"
#... (6 Replies)
o/p of my command is given below
My requirement is
if Pnumber is 0 then
stabilization.Build.2013
else
stabilization.PBuild.2013.3 (11 Replies)
Discussion started by: nikhil jain
11 Replies
LEARN ABOUT OSF1
pthread_condattr_init
pthread_condattr_init(3) Library Functions Manual pthread_condattr_init(3)NAME
pthread_condattr_init - Initializes a condition variable attributes object.
LIBRARY
DECthreads POSIX 1003.1c Library (libpthread.so)
SYNOPSIS
#include <pthread.h>
int pthread_condattr_init(
pthread_condattr_t *attr);
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
IEEE Std 1003.1c-1995, POSIX System Application Program Interface
PARAMETERS
Address of the condition variable attributes object to be initialized.
DESCRIPTION
This routine initializes the condition variable attributes object specified by the (attr) argument with a set of default attribute values.
When an attributes object is used to create a condition variable, the values of the individual attributes determine the characteristics of
the new condition variable. Attributes objects act as additional arguments to condition variable creation. Changing individual attributes
in an attributes object does not affect any condition variables that were previously created using that attributes object.
You can use the same condition variable attributes object in successive calls to pthread_condattr_init(3), from any thread. If multiple
threads can change attributes in a shared attributes object, your program must use a mutex to protect the integrity of that attributes
object.
Results are undefined if this routine is called and the attr argument specifies a condition variable attributes object that is already ini-
tialized.
The pthread_condattr_init(3) and pthread_condattr_destroy(3) routines are provided for future expandability of the DECthreads pthread
interface and to conform with the POSIX.1c standard. These routines serve no useful function, because there are no pthread_con-
dattr_set*(3) type routines available at this time.
RETURN VALUES
If an error condition occurs, this routine returns an integer value indicating the type of error. Possible return values are as follows:
Successful completion. The value specified by attr is not a valid condition variable attributes object. Insufficient memory exists to
initialize the condition variable attributes object.
ERRORS
None
RELATED INFORMATION
Functions: pthread_condattr_destroy(3), pthread_cond_init(3)
Manuals: Guide to DECthreads and Programmer's Guide
delim off
pthread_condattr_init(3)