Web hosting support - warning: ‘-’ deprecated; use ‘ps auwx’, not ‘ps
warning: ‘-’ deprecated; use ‘ps auwx’, not ‘ps -auwx’ By using the getOSName function given earlier in this chapter, we can adapt the getPID function to work with both the BSD and System V versions of ps. The modified version of getPID is as follows: getPID() { if [ $# -lt 1 ] ; then echo “ERROR: Insufficient Arguments.” >&2 return 1 fi case getOSName in bsd|sunos|linux) PSOPTS=”-auwx” ;; *) PSOPTS=”-ef” ;; esac /bin/ps $PSOPTS 2> /dev/null | grep “$1″ | grep -v grep | awk ‘{ print $2; }’ } The two main changes are l A case statement sets the variable PSOPTS based on the operating system name. l The STDERR of ps is redirected to /dev/null in order to discard the warning message generated on newer versions of Linux. Sams Teach Yourself Shell Programming in 24 Hours Contents Index Hour 23: Scripting for Portability Previous Chapter Next Chapter Sections in this Chapter: Determining UNIX Versions Questions Techniques for Increasing Portability Terms Summary Previous Section Next Section Copyright Macmillan Computer Publishing. All rights reserved.
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