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Full Discussion: Checking multiple conditions in UNIX IF-ELSE
Top Forums Shell Programming and Scripting Checking multiple conditions in UNIX IF-ELSE Post 302811707 by kumarjt on Friday 24th of May 2013 03:22:29 AM
Old 05-24-2013
Checking multiple conditions in UNIX IF-ELSE
I am posting this info only after having confirmed the fact that there are no prior posts avialable that serves my purpose .

In my Korn Shell script file , there are two shell variables which needs to be tested within a single if statement .

Sample variables :
$var1 and $var2

The check should be :
if $var1 is NULL(empty in Unix) OR $var2 == "Y" ,
then
do logic 1
else
do logic 2
fi

The way I wrote the if-else block is ;
Code:
 
if [ -z $var1 -o  $var2 == "Y" ]; then
     do logic 1
else
    do logic 2
fi

The problems I am facing are :
1. Even if for cases where $var1 is empty , logic 2 is executed
2. The script runs but with an error message like "argument expected"

I tested the two conditions individually , and they executed as expected , but when they are commbined with and -o operator , they yield improper result.

Can please somoeone help me ?

Thanks
Kumarjit Ghosh.
 

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sh

sh(1)							      General Commands Manual							     sh(1)

NAME

       sh - Shell, the standard command language interpreter

DESCRIPTION

       [Tru64  UNIX]  Tru64  UNIX  provides two command interpreters with the name sh.	The XCU5.0 and POSIX.2 compliant command interpreter sh is
       available in the file /usr/bin/posix/sh and is described in the sh(1p) reference page.  The Bourne shell,  historically	known  as  sh,	is
       available in the file /usr/bin/sh and is described in the sh(1b) reference page.

       [Tru64 UNIX]  Your initial, or login, shell is determined by your entry in the file /etc/passwd. This file can be changed only by your sys-
       tem administrator. You must use whatever procedures are in place at your location to have this entry changed.

       [Tru64 UNIX]  If available on your system, you may use the passwd -s or the chsh commands to change your login shell.

									  Note

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NOTES

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RESTRICTIONS

       [Tru64 UNIX]  The file /etc/shells must include entries for both the POSIX shell /usr/bin/posix/sh and the Bourne  shell,  /usr/bin/sh.	If
       this file is incorrect, see your system administrator.

EXAMPLES

       Using  the  Bourne,  Korn,  or  POSIX  shell, to set the variable BIN_SH to use the POSIX/ XCU5.0compliant shell, enter: BIN_SH=xpg4 export
       BIN_SH Using the Bourne, Korn, or POSIX shell, to set the variable BIN_SH to use the SVR4 compliant shell, enter: BIN_SH=svr4 export BIN_SH
       Using the Bourne, Korn, or POSIX shell, to unset the variable BIN_SH, enter: unset BIN_SH Using the C/ shell, to set the variable BIN_SH to
       use the POSIX/XCU5.0 compliant shell, enter: setenv BIN_SH xpg4 Using the C/ shell, to set the variable BIN_SH to use  the  SVR4  compliant
       shell, enter: setenv BIN_SH svr4 Using the C/ shell, to unset the variable BIN_SH, enter: unsetenv BIN_SH

FILES

       User profile.  Contains user information, including the login shell name.  Contains the names of available and permitted shells.

SEE ALSO

       Commands:  csh(1), ksh(1), Bourne shell sh(1b), POSIX shell sh(1p), passwd(1)

       Files:  passwd(4), shells(4)

       Standards:  standards(5)

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