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Full Discussion: How to pass cat file in awk statement?
Top Forums UNIX for Dummies Questions & Answers How to pass cat file in awk statement? Post 302941454 by RudiC on Thursday 16th of April 2015 06:56:20 AM
Old 04-16-2015
When tampering with system parameters, you should know EXACTLY wha you are doing! So, please be very careful and make backups.
Try
Code:
awk     '
BEGIN                   {getline shmmax < "/proc/sys/kernel/shmmax"
                         if((shmmax + 0) > 200)
                        }
/^kernel.printk/        {$3 = shmmax
                         done=1
                        }
1
END                     {if (done) exit
                         print "kernel.shmmax = ", shmmax
                        }
        ' /etc/sysctl.conf

and, when happy, redirect the output to a temp file and mv it to the target, then.
 

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LEARN ABOUT DEBIAN

sem

SEM(4)							   BSD Kernel Interfaces Manual 						    SEM(4)

NAME

     sem -- POSIX semaphores

SYNOPSIS

     To compile this driver into the kernel, place the following lines in your kernel configuration file:

	   options P1003_1B_SEMAPHORES

     Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

	   sem_load="YES"

	   kldload sem

DESCRIPTION

     The sem facility provides system calls used by the standard C library (libc) to implement POSIX semaphores.  This facility offers support for
     such functions as sem_init() and sem_wait().  It is available both as a kernel option for static inclusion and as a dynamic kernel module.

SEE ALSO

     sem_destroy(3), sem_getvalue(3), sem_init(3), sem_open(3), sem_post(3), sem_wait(3), config(8), kldload(8), kldunload(8)

HISTORY

     The sem facility appeared as a kernel option in FreeBSD 3.0.  The sem kernel module appeared in FreeBSD 5.0.

BSD
								 November 11, 2006							       BSD
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