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Full Discussion: ksh file handling
Top Forums Shell Programming and Scripting ksh file handling Post 302615059 by CarloM on Thursday 29th of March 2012 06:40:26 AM
Old 03-29-2012
ksh file handling
Specifically on RHEL 5.7.

When does the underlying ksh process open and close files? Every time they're accessed, or as little as possible?

Say you have some script like:
Code:
CreateFiles()
{
        grep "<VALUE1>" ${infile} >> ${outfile}
        grep "<VALUE2>" ${infile} >> ${outfile}
...
}

Assuming the files aren't explicitly opened or closed, will the shell do 2*open(2) (and 2*close(2) later on exit), or 4*open(2) and 4*close(2)?
 

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LEARN ABOUT X11R4

suspend

suspend(1)                                                         User Commands                                                        suspend(1)

NAME

       suspend - shell built-in function to halt the current shell

SYNOPSIS

   sh
       suspend

   csh
       suspend

   ksh
       suspend

DESCRIPTION

   sh
       Stops the execution of the current shell (but not if it is the login shell).

   csh
       Stop the shell in its tracks, much as if it had been sent a stop signal with ^Z. This is most often used to stop shells started by su.

   ksh
       Stops the execution of the current shell (but not if it is the login shell).

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), kill(1), ksh(1), sh(1), su(1M), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                         suspend(1)
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