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Full Discussion: how can i check if text file is closed ?
Top Forums Shell Programming and Scripting how can i check if text file is closed ? Post 302102730 by matrixmadhan on Friday 12th of January 2007 10:03:36 AM
Old 01-12-2007
Quote:
Originally Posted by jim mcnamara
Code:
#!/bin/ksh
in_use=$(fuser -u /path/to/file/filename)
if [ ${#in_use} -gt 0 ] ; then
   echo "file in use"
else
   echo "file not in use"
fi

I have few objections with the above!

on the same node with two different sessions,
I ran the following

session I
>
Code:
while :
do
echo "a" > file1
done

session II
>
Code:
while :
do 
fuser -u file1; echo $?
sleep 1
done


the output really alternates between being used -> not being used


from the man pages of fuser,
fuser returns a non-zero return code if none of the specified files is
accessed or in case of a fatal error. If at least one access has been
found, fuser returns zero.
 

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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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