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Full Discussion: PERL code to check if file exists
Top Forums Shell Programming and Scripting PERL code to check if file exists Post 302596098 by INHF on Monday 6th of February 2012 01:53:53 PM
Old 02-06-2012
PERL code to check if file exists
Hi Guy’s,

I have this simple PERL code which checks whether the file exists . At the moment I am getting the following error

Quote:
Ksh:syntax error:`(' unexpected
This is the code I am using

Code:
#!/usr/bin/perl
Open (F, "home/work/PerlWork/dataFile") or die "Could not open the file:$!\";

Also how can I read the content of the file line by line?

Please help

Thank you all
Last edited by INHF; 02-07-2012 at 03:02 PM..
 

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LEARN ABOUT CENTOS

sd_booted

SD_BOOTED(3)							     sd_booted							      SD_BOOTED(3)

NAME

       sd_booted - Test whether the system is running the systemd init system

SYNOPSIS

       #include <systemd/sd-daemon.h>

       int sd_booted(void);

DESCRIPTION

       sd_booted() checks whether the system was booted up using the systemd init system.

RETURN VALUE

       On failure, this call returns a negative errno-style error code. If the system was booted up with systemd as init system, this call returns
       a positive return value, zero otherwise.

NOTES

       This function is provided by the reference implementation of APIs for new-style daemons and distributed with the systemd package. The
       algorithm it implements is simple, and can easily be reimplemented in daemons if it is important to support this interface without using
       the reference implementation.

       Internally, this function checks whether the directory /run/systemd/system/ exists. A simple check like this can also be implemented
       trivially in shell or any other language.

       For details about the algorithm check the liberally licensed reference implementation sources:
       http://cgit.freedesktop.org/systemd/systemd/plain/src/libsystemd-daemon/sd-daemon.c and
       http://cgit.freedesktop.org/systemd/systemd/plain/src/systemd/sd-daemon.h

       sd_booted() is implemented in the reference implementation's sd-daemon.c and sd-daemon.h files. These interfaces are available as a shared
       library, which can be compiled and linked to with the libsystemd-daemon pkg-config(1) file. Alternatively, applications consuming these
       APIs may copy the implementation into their source tree. For more details about the reference implementation, see sd-daemon(3).

       If the reference implementation is used as drop-in files and -DDISABLE_SYSTEMD is set during compilation, this function will always return
       0 and otherwise become a NOP.

SEE ALSO

       systemd(1), sd-daemon(3)

systemd 208															      SD_BOOTED(3)
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