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Full Discussion: multiple processes overlap
Top Forums Shell Programming and Scripting multiple processes overlap Post 302274508 by JerryHone on Wednesday 7th of January 2009 06:46:17 PM
Old 01-07-2009
Unix doesn't necessarily flush the content to disk as soon as you've called echo. It will wait for a complete block of text or will force the flush when the file descriptors are closed, typically at the end of the script. You should be able to see this effect if you create a file slowly, such as...
Quote:
while true
do
echo x > /tmp/junk
sleep 1
done
and monitor /tmp junk as it's being written with
Quote:
tail -f /tmp/junk
It's difficult to force a flush to disk in Shell script. In Perl, you can use AUTOFLUSH ($!).
In shell, you could attempt to run the echo in a subshell - enclose the command in parentheses
Quote:
(echo `date +"%m/%d %H:%M"` $strTableName..$dbname - bcp out finished successfully)
although I'm not sure how succesful this would be!

Hope that helps.

Jerry
 

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SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME
script -- make typescript of terminal session SYNOPSIS
script [-a] [-k] [-q] [-t time] [file [command ...]] DESCRIPTION
The script utility makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript. If the argument command ... is given, script will run the specified command with an optional argument vector instead of an interactive shell. Options: -a Append the output to file or typescript, retaining the prior contents. -k Log keys sent to program as well as output. -q Run in quiet mode, omit the start and stop status messages. -t time Specify time interval between flushing script output file. A value of 0 causes script to flush for every character I/O event. The default interval is 30 seconds. The script ends when the forked shell (or command) exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. The script utility works best with commands that do not manipulate the screen. The results are meant to emulate a hardcopy terminal, not an addressable one. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism). HISTORY
The script command appeared in 3.0BSD. BUGS
The script utility places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. It is not possible to specify a command without also naming the script file because of argument parsing compatibility issues. When running in -k mode, echo cancelling is far from ideal. The slave terminal mode is checked for ECHO mode to check when to avoid manual echo logging. This does not work when in a raw mode where the program being run is doing manual echo. BSD
June 6, 1993 BSD
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