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Top Forums UNIX for Dummies Questions & Answers How to use a return code in an if statement? Post 302452300 by chatguy on Friday 10th of September 2010 12:34:06 AM
Old 09-10-2010
Question How to use a return code in an if statement?

Hi all,

After so many tries and searching online for ideas, I had trouble accomplishing this. Is it possible to do something like this in KSH to run an if statement on a return code?

Unfortunately the code below fails... Would anyone know how to fix the below attempt?
Code:
if [ "$`{pkginfo TestPackage}`" == "0" ]
then
  print "TestPackage DETECTED"
else
  print "TestPackage NOT detected"
fi

Other info:
When running "pkginfo TestPackage", I did notice when it does exist, afterward typing in "echo $?" will return 0 (success), and when it doesn't exist, it will return 1 (error).

But I wouldn't want the script to print the output of the "pkginfo TestPackage" to the user. I'm hoping to "only" output from the print command in the if statement.

Thanks again everyone for your help.
CG
 

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pkginfo(1)                                                         User Commands                                                        pkginfo(1)

NAME
pkginfo - display software package information SYNOPSIS
pkginfo [-q | -x | -l] [-p | -i] [-r] [-a arch] [-v version] [-c category...] [pkginst...] pkginfo [-d device] [-R root_path] [-q | -x | -l] [-a arch] [-v version] [-c category...] [pkginst...] DESCRIPTION
pkginfo displays information about software packages that are installed on the system (with the first synopsis) or that reside on a par- ticular device or directory (with the second synopsis). Without options, pkginfo lists the primary category, package instance, and the names of all completely installed and partially installed packages. It displays one line for each package selected. OPTIONS
The -p and -i options are meaningless if used in conjunction with the -d option. The options -q, -x, and -l are mutually exclusive. -a arch Specify the architecture of the package as arch. -c category Display packages that match category. Categories are defined with the CATEGORY parameter in the pkginfo(4) file. If more than one category is supplied, the package needs to match only one category in the list. The match is not case specific. -d device Defines a device, device, on which the software resides. device can be an absolute directory pathname or the identifiers for tape, floppy disk, removable disk, and so forth. The special token spool may be used to indicate the default installa- tion spool directory (/var/spool/pkg). -i Display information for fully installed packages only. -l Specify long format, which includes all available information about the designated package(s). -p Display information for partially installed packages only. -q Do not list any information. Used from a program to check whether or not a package has been installed. -r List the installation base for relocatable packages. -R root_path Defines the full path name of a directory to use as the root_path. All files, including package system information files, are relocated to a directory tree starting in the specified root_path. -v version Specify the version of the package as version. The version is defined with the VERSION parameter in the pkginfo(4) file. All compatible versions can be requested by preceding the version name with a tilde (~). Multiple white spaces are replaced with a single white space during version comparison. -x Designate an extracted listing of package information. The listing contains the package abbreviation, package name, package architecture (if available) and package version (if available). OPERANDS
pkginst A package designation by its instance. An instance can be the package abbreviation or a specific instance (for example, inst.1 or inst.2). All instances of a package can be requested by inst.*. The asterisk character (*) is a special character to some shells and may need to be escaped. In the C-Shell, "*" must be surrounded by single quotes (') or preceded by a backslash (). EXIT STATUS
0 Successful completion. >0 An error occurred. FILES
/var/spool/pkg default installation spool directory ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
pkgtrans(1), pkgadd(1M), pkgask(1M), pkgchk(1M), pkgrm(1M), pkginfo(4), attributes(5) Application Packaging Developer's Guide SunOS 5.10 6 Nov 2000 pkginfo(1)
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