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Full Discussion: Sleep Command
Top Forums Shell Programming and Scripting Sleep Command Post 302573780 by Corona688 on Tuesday 15th of November 2011 01:47:48 PM
Old 11-15-2011
That's a useless use of cat.

You don't need to count how many lines grep outputs to tell whether it matches anything or not: grep tells you directly, returning zero if it found anything, nonzero if it didn't, letting you plug it directly into an if or other logical statement.

Try
Code:
while true
do
        if ! ps -ef | grep '[e]xecute' > /dev/null
        then
                tail -20 /log.log | mailx -s "Log" $mailto
                break
        fi

        sleep 10
done

The '[e]xecute' avoids needing grep -v grep, since the regular expression '[e]xecute' will still match the string "execute" but won't match the string "[e]xecute".
 

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LEARN ABOUT OSF1

lastcomm

lastcomm(8)						      System Manager's Manual						       lastcomm(8)

NAME

       lastcomm - Outputs information about the last commands executed

SYNOPSIS

       lastcomm [Command] [Name] [Tty]

DESCRIPTION

       The  lastcomm  command  outputs	information about all previously executed commands that are recorded in the /var/adm/pacct file in reverse
       chronological order.

       You may specify a particular command with the Command parameter, a particular user with the Name parameter, and a  particular  terminal	as
       the  command  source  with the Tty parameter. Output is then restricted to the specified parameters. A Tty terminal may be named fully (for
       example, tty0) or abbreviated (for example, 0).

       The following information is displayed for each process: Name of the command under which the process was called.  Any flags collected  when
       the  command  was  executed.  The following flags are valid: Command was run with an effective user-id of 0.  Command ran after a fork, but
       without an exec system call following it.  Name of the user who issued the command.  The terminal the command was started from.	Seconds of
       CPU time used.  Time the process started.

EXAMPLES

       To display information about all previously executed commands recorded in the /var/adm/pacct file, enter: lastcomm Information is displayed
       similar to: lastcomm    ajh	lat/620        1.13 secs Thu Feb 24 15:02 pg	      ajh      lat/620	      5.91 secs Thu Feb  24  15:01
       ln	    miller    ttyp1	      1.14  secs  Thu  Feb  24	15:01  ls	    rob       ttyp1	     0.02 secs Thu Feb 24 15:01 pg
       sjz	ttyp1	       0.33 secs Thu Feb 24 15:00 sendmail SF root     __	      0.01 secs Thu Feb 24 15:00  To  display  information
       about commands named a.out executed by the root user on terminal ttyd0, enter: lastcomm a.out root ttyd0

FILES

       Specifies the command path.  The current accounting file.

RELATED INFORMATION

       Commands:  last(8) delim off

																       lastcomm(8)
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