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Full Discussion: Writing if condition in shell script and failing to do requirement
Top Forums Shell Programming and Scripting Writing if condition in shell script and failing to do requirement Post 302898773 by Don Cragun on Wednesday 23rd of April 2014 11:30:46 PM
Old 04-24-2014
You didn't show us how the shell variable ABC was set in your script and there was no mention of updating kernel.shmall so I don't know what this code from your script is trying to do:
Code:
     echo "kernel.shmall=" >> /mqseries1/sysctl.conf
     sed -i "s|\("kernel.shmall" *= *\).*|\1123|" file.con

Other than that, you could try something like:
Code:
#!/bin/ksh
file=${1:-file.con}
cp "$file" "_$file" && awk '
BEGIN {	FS = OFS = "=" }
$1 == "ABC" {
	found++
	if($2 < 123) $2 = 123
}
1
END {	if(!found) print "ABC=123" }
' "_$file" > "$file"

Unlike your script, this will leave a backup of your input file using the input filename with a leading underscore as the backup file. Although tested with a Korn shell, this will work with any shell that recognizes POSIX shell variable expansions.

By default, this script works on a file named file.con (as in your example), but you can invoke this script with one operand that names any file you want it to process.
 

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LEARN ABOUT OPENSOLARIS

script

script(1)							   User Commands							 script(1)

NAME

       script - make record of a terminal session

SYNOPSIS

       script [-a] [filename]

DESCRIPTION

       The  script  utility  makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the
       record is saved in the file typescript. See WARNINGS.

       The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends
       when the forked shell exits or when Control-d is typed.

OPTIONS

       The following option is supported:

       -a    Appends the session record to filename, rather than overwriting it.

NOTES

       script places everything that appears on the screen in filename, including prompts.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

WARNINGS

       script  can  pose  a  security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a
       privileged user, that is, root. Be sure that typescript is not a link before running script.

SunOS 5.11							    30 Jan 2004 							 script(1)
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