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Shell Programming and Scripting
Script to move the first line of a file to the end
Post 302272548 by matrixmadhan on Wednesday 31st of December 2008 12:03:42 AM
12-31-2008
Quote:
It is possible to write scripts which might work efficiently but are unintelligible to newbies
)Initially for a newbie it might be of interest to get the task done and later it might be interesting and a good learning experience to make it better, optimal without having to spawn too many processes where it could be achieved by shell built-ins etc.
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LEARN ABOUT CENTOS
spawn.h
spawn.h(3HEAD) Headers spawn.h(3HEAD) NAME
spawn.h, spawn - spawn SYNOPSIS
#include <spawn.h> DESCRIPTION
The <spawn.h> header defines the posix_spawnattr_t and posix_spawn_file_actions_t types used in performing spawn operations. The <spawn.h> header defines the flags that can be set in a posix_spawnattr_t object using the posix_spawnattr_setflags() function: POSIX_SPAWN_RESETIDS POSIX_SPAWN_SETPGROUP POSIX_SPAWN_SETSCHEDPARAM POSIX_SPAWN_SETSCHEDULER POSIX_SPAWN_SETSIGDEF POSIX_SPAWN_SETSIGMASK Inclusion of the <spawn.h> header can make visible symbols defined in the <sched.h>, <signal.h>, and <sys/types.h> headers. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
sched.h(3HEAD), semaphore.h(3HEAD), signal.h(3HEAD), types.h(3HEAD), attributes(5), standards(5) SunOS 5.10 10 Sep 2004 spawn.h(3HEAD)