Help awking a 'head -1 file.txt' input Post: 302401310

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Top Forums Shell Programming and Scripting Help awking a 'head -1 file.txt' input Post 302401310 by tmf33uk on Friday 5th of March 2010 01:14:50 PM

03-05-2010

Registered User

Help awking a 'head -1 file.txt' input

Hi there,

my ksh script collects a procstack trace for a particular pid and then greps it by a transaction id to find out the pthread ID:
---------- tid# 1876087 (pthread ID: 4466) ----------

So the pthread ID I want is 4466 in this case, and it is assighed to the variable $pthread. This works fine so far.

After this point, I need to read the first line of a few files whose names are composed by several variables in $HEAD_FILE and a number that it reads from file task2. This currently contains:
32888
So HEAD_FILE will be /logs/eComm_esn_32888.log and the loop will only run once. The first line of this file contains:
1021 2010-03-02 17:06:17 0000-00-00 00:00:00 +0100 00000000 001 003f 0001 09 eComm 32888 893162 4466 /logs/eComm_32888.log 7.8.2.8 [19237] ESN

I want to set a condition that if field number 15 is equal to the pthread ID (4466) it should print the whole line. Otherwise not. AWK has difficulty in reading the first few characters, so I have used sed to replace them with "nothing" (8 dots).
This makes 4466 be in the $14th position now so I can change the condition.

Here�s the relevant part of the script:
========

Code:

## Take a procstack trace of the pid to find the pthread_id
                        procstack $PID > "${OM}_procstack_${PID}.txt"
                        pthread=`cat $OM_procstack_$PID.txt |grep $TID | sed -e 's/^.*ID: //' -e 's/).*//g'`
                        echo "   "
                        echo "------pthread ID corresponding to transaction $TID is $pthread ------" >> $LOG
                        while read line
                           do
                                HEAD_FILE=`head -1 /logs/eComm_${line}.log | sed -e 's/^........//g'`
                                echo $HEAD_FILE
                                awk '$14 == 4466 {print $14, $15, $16}' < $HEAD_FILE
                           done < task2
                fi
        done < tasks

=======

Running this as it is gives me the following:

Code:

2010-03-02 17:06:17 0000-00-00 00:00:00 +0100 00000000 001 003f 0001 09 eComm 32888 893162 4466 /logs/eComm_32888.log 7.8.2.8 [19237] ESN
No such file or directory
./orange.sh[83]: 2010-03-02 17:06:17 0000-00-00 00:00:00 +0100 00000000 001 003f 0001 09 eComm 32888 893162 4466 /logs/eComm_32888.log 7.8.2.8 [19237] ESN: cannot open

=======

So it echoes the value of HEAD_FILE as it understands it now, and the number I am interested in is in 14th position, but I don�t know how to get around the 'cannot open' error to make my condition work.

I only want the 1st line of the file read in the loop which contains the number matching the value of $pthread, obtained a little earlier (4466). Does anyone have any ideas of what I am doing wrong? I think I�ve been staring at this too long..

Thanks in advance!
T.

Last edited by radoulov; 03-05-2010 at 03:03 PM..

tmf33uk

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LEARN ABOUT CENTOS

pthread

pthread.h(3HEAD)						      Headers							  pthread.h(3HEAD)

NAME

       pthread.h, pthread - threads

SYNOPSIS

       #include <pthread.h>

DESCRIPTION

       The <pthread.h> header defines the following symbols:

       PTHREAD_BARRIER_SERIAL_THREAD
       PTHREAD_CANCEL_ASYNCHRONOUS
       PTHREAD_CANCEL_ENABLE
       PTHREAD_CANCEL_DEFERRED
       PTHREAD_CANCEL_DISABLE
       PTHREAD_CANCELED
       PTHREAD_COND_INITIALIZER
       PTHREAD_CREATE_DETACHED
       PTHREAD_CREATE_JOINABLE
       PTHREAD_EXPLICIT_SCHED
       PTHREAD_INHERIT_SCHED
       PTHREAD_MUTEX_DEFAULT
       PTHREAD_MUTEX_ERRORCHECK
       PTHREAD_MUTEX_INITIALIZER
       PTHREAD_MUTEX_NORMAL
       PTHREAD_MUTEX_RECURSIVE
       PTHREAD_ONCE_INIT
       PTHREAD_PRIO_INHERIT
       PTHREAD_PRIO_NONE
       PTHREAD_PRIO_PROTECT
       PTHREAD_PROCESS_SHARED
       PTHREAD_PROCESS_PRIVATE
       PTHREAD_SCOPE_PROCESS
       PTHREAD_SCOPE_SYSTEM

       The types listed below are defined as described in <sys/types.h>. See types.h(3HEAD).

       pthread_attr_t
       pthread_barrier_t
       pthread_barrierattr_t
       pthread_cond_t
       pthread_condattr_t
       pthread_key_t
       pthread_mutex_t
       pthread_mutexattr_t
       pthread_once_t
       pthread_rwlock_t
       pthread_rwlockattr_t
       pthread_spinlock_t
       pthread_t

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       sched.h(3HEAD),	  time.h(3HEAD),    types.h(3HEAD),   pthread_attr_getguardsize(3C),   pthread_attr_init(3C),	pthread_attr_setscope(3C),
       pthread_cancel(3C),   pthread_cleanup_pop(3C),	pthread_cond_init(3C),	 pthread_cond_signal(3C),   pthread_cond_wait(3C),    pthread_con-
       dattr_init(3C),	pthread_create(3C), pthread_detach(3C), pthread_equal(3C), pthread_exit(3C), pthread_getconcurrency(3C), pthread_getsched-
       param(3C),    pthread_join(3C),	  pthread_key_create(3C),    pthread_key_delete(3C),	pthread_mutex_init(3C),    pthread_mutex_lock(3C),
       pthread_mutex_setprioceiling(3C),   pthread_mutexattr_init(3C),	 pthread_mutexattr_init(3C),   pthread_mutexattr_init(3C),  pthread_mutex-
       attr_gettype(3C),     pthread_mutexattr_getprotocol(3C),     pthread_once(3C),	  pthread_rwlock_init(3C),	pthread_rwlock_rdlock(3C),
       pthread_rwlock_unlock(3C),  pthread_rwlock_wrlock(3C),  pthread_rwlockattr_getpshared(3C),  pthread_rwlockattr_init(3C),  pthread_self(3C),
       pthread_setcancelstate(3C), pthread_setspecific(3C), attributes(5), standards(5)

SunOS 5.10							    9 Sep 2004							  pthread.h(3HEAD)