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Full Discussion: Shell advanced syntax?
Top Forums Shell Programming and Scripting Shell advanced syntax? Post 302463746 by alt on Monday 18th of October 2010 10:42:07 AM
Old 10-18-2010
Shell advanced syntax?

I am not an expert of shell scripting, but I can do some simple things. Now, I read a script written by others and I need some help from the experts of this forum.

Please help me to understand what is going on in this cycle:
Code:
if [ $COMPILER = "sun" ]; then
[[ -f /sunstudio12/bin/sunf90 ]] && \
      export IMDI_COMPILER=/sunstudio12/bin/sunf90 || \
      { 
      echo "Please specify location!"; exit; 
      }
    [[ -z "$SZIP_ROOT" ]] && SZIP_ROOT=/szip-2.1
elif [ $COMPILER = "intel" ]; then
....

In particular, I do not understand this synax: [[...]] && \ export... ||,
where the || operand is used after the export command. It rise by me the question if the export command return any Boolean value?

Thank you in advance for help!
 

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parse_dynamic_clustertoc(1M)				  System Administration Commands			      parse_dynamic_clustertoc(1M)

NAME
parse_dynamic_clustertoc - parse clustertoc file based on dynamic entries SYNOPSIS
cdrom/export/exec/sparc.Solaris_2.x/sbin/install.d/parse_dynamic_clustertoc cdrom/export/exec/i386.Solaris_2.x/sbin/install.d/parse_dynamic_clustertoc DESCRIPTION
This script parses the clustertoc file before the suninstall(1M) process is run. parse_dynamic_clustertoc is called by a modified syscon- fig script on the install CD. When parse_dynamic_clustertoc runs, it reads the clustertoc and when it encounters SUNW_CSRMBRIFF lines, it either checks the platform using the script's builtin function, or calls an external script. The script exits with a 0 if the cluster entry is included, otherwise it will be ignored. If the cluster entry is to be included, the SUNW_CSRMBRIFF =(test test_arg)cluster line is converted to SUNW_CSRMEMBER =cluster. EXAMPLES
Example 1: Checking For an SX Framebuffer The following is an example of a simple external test to check for an SX Framebuffer. The entry in the clustertoc file is shown and fol- lowing that is the script that must be placed in the install.d/dynamic_test directory. SUNW_CSRMBRIFF=(smcc.dctoc sx)SUNWCsx #! /bin/sh # # Likewise, this file is expected to live under $(TESTDIR). # case "$1" in sx) prtconf -p | grep 'SUNW,sx' 1> /dev/null;; esac FILES
cdrom/Solaris_2.x/locale/C/.clustertoc.dynamic Dynamic version of the clustertoc file cdrom/export/exec/sparc.Solaris_2.x/sbin/install.d/dynamic_test Directory that contains any additional tests cdrom/export/exec/i386.Solaris_2.x/sbin/install.d/dynamic_test Directory that contains any additional tests ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SHWPcdrom (Solaris CD) | +-----------------------------+-----------------------------+ SEE ALSO
suninstall(1M), clustertoc(4), attributes(5) SunOS 5.10 6 Sep 1995 parse_dynamic_clustertoc(1M)
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