watching for a file Post: 302441141

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Top Forums Shell Programming and Scripting watching for a file Post 302441141 by methyl on Thursday 29th of July 2010 10:53:33 AM

07-29-2010

Registered User

Lateral though way of letting the script flow after the file arrives.

Beware that the presence of a filename in a directory does not mean that the process writing the file has finished.
The process writing the file could write the file under a temporary name and then rename the file to its correct name at the end of the transfer.

Code:

filename="myfile"
for T in 5 5 5 5 5 5 X
do
        if [ "${T}" = "X" ]
        then
                echo "File ${filename} did not arrive"
                exit
        fi
        if [ -f "${filename}" ]
        then
                echo "File ${filename} arrived"
                break
        fi
        echo "File ${filename} yet to arrive. Waiting ${T} seconds"
        sleep ${T}
done
#
# Processing of ${filename} goes here

methyl

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LEARN ABOUT SUNOS

script

script(1)							   User Commands							 script(1)

NAME

       script - make record of a terminal session

SYNOPSIS

       script [-a] [filename]

DESCRIPTION

       The  script  utility  makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the
       record is saved in the file typescript. See WARNINGS.

       The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends
       when the forked shell exits or when Control-d is typed.

OPTIONS

       The following option is supported:

       -a	Appends the session record to filename, rather than overwriting it.

NOTES

       script places everything that appears on the screen in filename, including prompts.

ATTRIBUTES

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

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

SEE ALSO

       attributes(5)

WARNINGS

       script  can  pose  a  security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a
       privileged user, that is, root. Be sure that typescript is not a link before running script.

SunOS 5.10							    30 Jan 2004 							 script(1)