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Full Discussion: Alternate to SLEEP for EXPECT within BASH script?
Top Forums Shell Programming and Scripting Alternate to SLEEP for EXPECT within BASH script? Post 302596139 by Goatfarmer03 on Monday 6th of February 2012 04:33:58 PM
Old 02-06-2012
Alternate to SLEEP for EXPECT within BASH script?
Fairly new to the System Admin world, and this is my first post here, hoping to get some clarification.

I am using a BASH script to automate some Logfile Archiving (into .tars). The actual logfiles are accessed through an SSH, so I have used the following EXPECT sub-script within my main BASH script (which includes tons of other stuff) :
Code:
 expect - << EOF
 spawn ssh $serverName
 match_max 100000
 expect -exact "$SIGNEDIN@$serverName\'s password: "
 send -- "$PASS\r"
 expect -exact "\[$SIGNEDIN@$serverName ~\]# "
 send -- "cd /folder1/logfiles\r"
 expect -exact "\[$SIGNEDIN@$serverName logfiles\]# "
 send -- "tar -cvf logs.$serverName.$CURRENTDATE.tar *.log\r"
 SLEEP 30s
 expect -exact "\[$SIGNEDIN@$serverName logfiles\]# "
 send -- "mv *.tar LOG_ARCHIVE\r"
 expect -exact "\[$SIGNEDIN@$serverName logfiles\]# "
 send -- "exit\r"
 EOF

All of the variables are set earlier in the script and this is actually working exactly as it should . . . but only when the filesizes are small. Some of the servers have small logfiles and some have huge logfiles. The small ones finish long before the 30s SLEEP, but yet sometimes the 30s SLEEP is not long enough for the larger servers. This causes the "mv" command to run before it finishes, and then the whole process is shot. I could increase the SLEEP timer to an even larger number to make sure the "tar -cvf" command completes . . . . but I am already impatient enough. There has got to be a better way to do this.

Anyone please chime in with some ideas, I am willing to try anything (except keys, I cannot use keys)
Last edited by Franklin52; 02-07-2012 at 03:51 AM.. Reason: Please use code tags for code and data samples, thank you
 

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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)
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