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Full Discussion: zombie process
Operating Systems Linux zombie process Post 302179221 by era on Thursday 27th of March 2008 08:48:05 AM
Old 03-27-2008
The use of grep to post-process awk output is kind-of aberrant; just use awk to figure out which lines have a Z.

Code:
ps aux | awk '$8=="Z" { print $2 }'

ps output is somewhat platform-dependent (this seems to work on Linux at least, but might need tweaks for other architectures), and obtaining this information from the kernel on the C level doubly so. On Linux, the proc pseudo-filesystem provides this information. See the proc(5) manual page.
 

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GREP(1) 						      General Commands Manual							   GREP(1)

NAME
grep - search a file for lines containing a given pattern SYNOPSIS
grep [-elnsv] pattern [file] ... OPTIONS
-e -e pattern is the same as pattern -c Print a count of lines matched -i Ignore case -l Print file names, no lines -n Print line numbers -s Status only, no printed output -v Select lines that do not match EXAMPLES
grep mouse file # Find lines in file containing mouse grep [0-9] file # Print lines containing a digit DESCRIPTION
Grep searches one or more files (by default, stdin) and selects out all the lines that match the pattern. All the regular expressions accepted by ed and mined are allowed. In addition, + can be used instead of * to mean 1 or more occurrences, ? can be used to mean 0 or 1 occurrences, and | can be used between two regular expressions to mean either one of them. Parentheses can be used for grouping. If a match is found, exit status 0 is returned. If no match is found, exit status 1 is returned. If an error is detected, exit status 2 is returned. SEE ALSO
cgrep(1), fgrep(1), sed(1), awk(9). GREP(1)
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