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Full Discussion: Script to kill process
Top Forums Shell Programming and Scripting Script to kill process Post 74853 by bakunin on Tuesday 14th of June 2005 12:13:34 AM
Old 06-14-2005
Quote:
Originally Posted by Lestat
Hello guys,
Code:
ps -aef | grep monitoreo | grep -v grep | cut -d" " -f8 > pid_file

There are two problems with this line:

1. by using double quotes to surround the space in the '-d'-option of "cut" you don't guard this space from shell expansion in every case. Maybe this is not causing you problems right now, but better to use single quotes: ... | cut -d' ' ...

2. you use a single space as a field delimiter. By looking at the output of 'ps' you will notice that it is in tabbed format, that is: with more than one blank separating the fields. Either use 'cut' with the '-c' (column) option (not recommendable) or change the occurrance of one or more spaces to one space before:

... | sed 's/<space><space>*/<space>/g' | cut -d' ' ...

replace the <space> to real space characters above.

Hope this helps

bakunin
 

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LEARN ABOUT SUSE

cut

CUT(1)								   User Commands							    CUT(1)

NAME

       cut - remove sections from each line of files

SYNOPSIS

       cut OPTION... [FILE]...

DESCRIPTION

       Print selected parts of lines from each FILE to standard output.

       Mandatory arguments to long options are mandatory for short options too.

       -b, --bytes=LIST
	      select only these bytes

       -c, --characters=LIST
	      select only these characters

       -d, --delimiter=DELIM
	      use DELIM instead of TAB for field delimiter

       -f, --fields=LIST
	      select only these fields;  also print any line that contains no delimiter character, unless the -s option is specified

       -n     with -b: don't split multibyte characters

       --complement
	      complement the set of selected bytes, characters or fields

       -s, --only-delimited
	      do not print lines not containing delimiters

       --output-delimiter=STRING
	      use STRING as the output delimiter the default is to use the input delimiter

       --help display this help and exit

       --version
	      output version information and exit

       Use  one,  and only one of -b, -c or -f.  Each LIST is made up of one range, or many ranges separated by commas.  Selected input is written
       in the same order that it is read, and is written exactly once.	Each range is one of:

       N      N'th byte, character or field, counted from 1

       N-     from N'th byte, character or field, to end of line

       N-M    from N'th to M'th (included) byte, character or field

       -M     from first to M'th (included) byte, character or field

       With no FILE, or when FILE is -, read standard input.

AUTHOR

       Written by David M. Ihnat, David MacKenzie, and Jim Meyering.

REPORTING BUGS

       Report cut bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>

COPYRIGHT

       Copyright (C) 2009 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The full documentation for cut is maintained as a Texinfo manual.  If the info and cut programs are properly installed at  your	site,  the
       command

	      info coreutils 'cut invocation'

       should give you access to the complete manual.

GNU coreutils 7.1						     July 2010								    CUT(1)
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