08-13-2008
simple script detect to find OS version/flavour
Hi,
A newbie question.
Following script gives no output.
===============================
root@srv [~]# cat /etc/redhat-release | awk {'print $1}'
Red
root@srv [~]# cat 123.sh
if (( `cat /etc/redhat-release | awk {'print $1}'` != CentOS )); then { echo "System runs on Redhat Linux. Exiting..."; exit; } fi
root@srv [~]# sh 123.sh
root@srv [~]#
root@srv [~]# if (( `cat /etc/redhat-release | awk {'print $1}'` != CentOS )); then { echo "System runs on Redhat Linux. Exiting..."; exit; } fi
root@srv [~]#
root@srv [~]# sh -x 123.sh
++ cat /etc/redhat-release
++ awk '{print $1}'
+ (( Red != CentOS ))
root@srv [~]#
Please advise or provide a alternative so that I can include it in a shell script that will use up2date, in case it is RHEL ( i am aware RHEL 5 use yum ) and will use yum incase it is CentOS
Thanks
Last edited by fed.linuxgossip; 08-13-2008 at 11:37 AM..
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LEARN ABOUT MOJAVE
jrunscript
jrunscript(1) General Commands Manual jrunscript(1)
NAME
jrunscript - command line script shell
SYNOPSIS
jrunscript [ options ] [ arguments... ]
PARAMETERS
options
Options, if used, should follow immediately after the command name.
arguments
Arguments, if used, should follow immediately after options or command name.
DESCRIPTION
jrunscript is a command line script shell. jrunscript supports both an interactive (read-eval-print) mode and a batch (-f option) mode of
script execution. This is a scripting language independent shell. By default, JavaScript is the language used, but the -l option can be
used to specify a different language. Through Java to scripting language communication, jrunscript supports "exploratory programming"
style.
NOTE: This tool is experimental and may not be available in future versions of the JDK.
OPTIONS
-classpath path
Specify where to find the user's .class files that are accessed by the script.
-cp path
This is a synonym for -classpath path
-Dname=value
Set a Java system property.
-Jflag
Pass flag directly to the Java virtual machine on which jrunscript is run.
-l language
Use the specified scripting language. By default, JavaScript is used. Note that to use other scripting languages, you also need to spec-
ify the corresponding script engine's jar file using -cp or -classpath option.
-e script
Evaluate the given script. This option can be used to run "one liner" scripts specified completely on the command line.
-encoding encoding
Specify the character encoding used while reading script files.
-f script-file
Evaluate the given script file (batch mode).
-f -
Read and evaluate a script from standard input (interactive mode).
-help
Output help message and exit.
-?
Output help message and exit.
-q
List all script engines available and exit.
ARGUMENTS
If [arguments...] are present and if no -e or -f option is used, then the first argument is the script file and the rest of the arguments,
if any, are passed as script arguments. If [arguments..] and -e or -f option are used, then all [arguments..] are passed as script argu-
ments. If [arguments..], -e and -f are missing, interactive mode is used. Script arguments are available to a script in an engine variable
named "arguments" of type String array.
EXAMPLES
Executing inline scripts
jrunscript -e "print('hello world')"
jrunscript -e "cat('http://java.sun.com')"
Use specified language and evaluate given script file
jrunscript -l js -f test.js
Interactive mode
jrunscript
js>print('hello world');
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Run script file with script arguments
jrunscript test.js arg1 arg2 arg3
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SEE ALSO
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06 Aug 2006 jrunscript(1)