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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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ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME
zgrep - search possibly compressed files for a regular expression SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename... DESCRIPTION
Zgrep is used to invoke the grep on compress'ed or gzip'ed files. All options specified are passed directly to grep. If no file is speci- fied, then the standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep. If zgrep is invoked as zegrep or zfgrep then egrep or fgrep is used instead of grep. If the GREP environment variable is set, zgrep uses it as the grep program to be invoked. For example: for sh: GREP=fgrep zgrep string files for csh: (setenv GREP fgrep; zgrep string files) AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), egrep(1), fgrep(1), zdiff(1), zmore(1), znew(1), zforce(1), gzip(1), gzexe(1) ZGREP(1)
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