How do I assign the output of a command to a variable within a loop in bash?
In the else of the main if condition .
When I run the above on command line , the execution seems to be fine and I get the desired output. But when I try to assign it to a variable within a loop , it doesnt get assigned.Hence the "if condition" after the variable assignment doesnt get evaluated.
Os Version : RHEL 6.0
Last edited by sankasu; 04-14-2019 at 05:11 PM..
Reason: An additional bracket made it to the code..removed the same
Hi,
I am giving a grep command, and i am getting the output. i want to store it in a variable
for eg
a = grep '12345' /dir/1/2/log.txt ( the output is number)
b= grep 'basic' /dir/1/2/log1.txt (in this case the output is character)
so how to assign the output of grep to a variable
... (1 Reply)
Good day, everyone!
I've got a small problem with re-assigning the variable form the loop. What I'm trying to do is:
#!/bin/bash/
VAR1="AAA"
VAR2="BBB"
VAR3="CCC"
for WORD in VAR1 VAR2 VAR3;
do
$WORD="DDD"
echo $WORD
done
:o
That's the output and error messages:
-bash:... (2 Replies)
Hi
I am trying to write a function that needs to be able to assign the last run shell command to a variable. The actual command string itself not the exit code of the command.
I am using the bash command recall ability to do this as follows:
alias pb='ps | grep ash' ... (3 Replies)
Hi ,
I would like to assign command (with pipe) output to a variable. The code is as follows. The goal of the code is to get the last folder folder with a particular name pattern.
myDate=`ls | grep 2009 | tail -1`
echo "myDate=" $myDate
However, in the presence of the pipe, the code... (3 Replies)
greetings all,
I am have a heck of a time trying to accomplish a very simple thing. I have an array of "shortname<spaces>id" created from a dscl output. I want to assign shortname=word1 and id=word2. I have tried
shortname=$(${textArray} | awk '{print $1}') - and get 'awk : cannot open... (3 Replies)
Hi,
I've a requirement where I want to re-assign the value in the variable through which FOR LOOP loops.
For e.g.
Snippet of code
---------------
for i in $var
do
echo $i >> $tempFile
var=`echo $another_var | awk -F" " '{print $1}'`
done
I am re-assigning var so... (2 Replies)
Hi, wondering if it's been asked before but didn't find matches from google. Basically I have this line:
myvar=$(echo -e "a\tb")
Now somehow the '\t' from the echo output gets replaced with white space and then stored in $myvar.
It creates a problem for me later to use tab as delimiter to do... (2 Replies)
Code
set -x
STATUS="0"
echo $STATUS
for i in `ls -ltr Report*|awk '{ print $9 }'`
do
if
then
flg = "`head -1 "$i" |cut -c 31-33`"
echo `head -1 "$i" |cut -c 31-33`
echo $flg
if
then
echo "having Fun"
STATUS="2"
else
echo "no Fun"
fi
fi (2 Replies)
Hi
As bash does not support multidimensional arrays (?), I need some help with a problem. What I want to do is to assign variable names containing a counter in a loop .
what I want to do is basically something like this:
#!/bin/bash
for i in {1..8}; do
var$i = "some command"
done... (6 Replies)
Hi,
I am trying to get a loop counter i and set its value as the ouput of a command:
i=`printmo TEST1 | grep -i TEST2 | wc -l`
Then I want to use i as counter to run a loop i number of times.
Like if i gets a value of 5 I'll have to run loop 5 times.
But will i here be a numeric... (3 Replies)
Discussion started by: pat_pramod
3 Replies
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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)